DS21FT44N

DS21FT44/DS21FF44 4 x 3 12-Channel E1 Framer 4 x 4 16-Channel E1 Framer www.maxim-ic.com FEATURES § § § § § § § APPLICATIONS 16 or 12 completely independent E1 framers in one small 27mm x 27mm package Each multichip module (MCM) contains either four (FF) or three (FT) DS21Q44 die Each quad framer can be concatenated into a single 8.192MHz backplane data stream IEEE 1149.1 JTAG-Boundary Scan Architecture DS21FF44 and DS21FT44 are pin compatible with DS21FF42 and DS21FT42, respectively, to allow the same footprint to support T1 and E1 applications 300-pin MCM BGA 1.27mm pitch package (27mm x 27mm) Low-power 3.3V CMOS with 5V tolerant input and outputs § § § § DSLAMs Multiplexers/Demultiplexers Switches High-Density Line Cards ORDERING INFORMATION PART CHANNEL PIN-PACKAGE TEMP. RANGE DS21FT44 DS21FT44N DS21FF44 DS21FF44N 12 12 16 16 300-BGA, 27mm x 27mm 300-BGA, 27mm x 27mm 300-BGA, 27mm x 27mm 300-BGA, 27mm x 27mm 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C 1. DESCRIPTION The 4 x 4 and 4 x 3 MCMs offer a high-density packaging arrangement for the DS21Q44 E1 enhanced quad framer. Either three (DS21FT44) or four (DS21FF44) silicon die of these devices is packaged in a multichip module (MCM) with the electrical connections as shown in Figure 1-1. All of the functions available on the DS21Q44 are also available in the MCM packaged version. However, in order to minimize package size, some signals have been deleted or combined. These differences are detailed in Table 1-1. In the 4 x 3 (FT) version, the fourth quad framer is not populated and thus all the signals to and from this fourth framer are absent and should be treated as no connects (NC). Table 2-1 lists all of the signals on the MCM and it also lists the absent signals for the 4 x 3. The availability of both a 12-channel and a 16-channel version allow the maximum framer density with the lowest cost. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: http://www.maxim-ic.com/errata. 1 of 117 071702 DS21FT44/DS21FF44 Changes from Normal DS21Q44 Configuration 1) TSYSCLK and RSYSCLK are connected together. 2) These signals are not available: RFSYNC/RLCLK/RLINK/RCHCLK/RMSYNC/RLOS/LOTC/TCHBLK/TLCLK/TLINK/TCHCLK Figure 1-1. DS21FT44/DS21FF44 SCHEMATIC DS21Q44 # 1 DVSS DVSS FMS TLINK0/1/2/3 TEST MUX BTS 2 FS0/FS1 WR* RD* A0 to A7 8 8 Signals Not Connected & Left Open Circuited Include: RLOS/LOTC RLINK RLCLK RCHCLK RMSYNC RFSYNC TLCLK TCHCLK TCHBLK RCLK1/2/3/4 RPOS1/2/3/4 RNEG1/2/3/4 RSER1/2/3/4 RSIG1/2/3/4 RSYNC1/2/3/4 RCHBLK1/2/3/4 TSYSCLK1/2/3/4 TCLK1/2/3/4 INT* JTRST TPOS1/2/3/4 TNEG1/2/3/4 JTMS JTCLK TSER1/2/3/4 TSIG1/2/3/4 JTDI JTDO TSSYNC1/2/3/4 TSYNC1/2/3/4 DS21Q44 # 2 DVSS DVSS CLKSI FMS TLINK0/1/2/3 TEST MUX BTS RD* A0 to A7 CLKSI 8MCLK RSYSCLK1/2/3/4 D0 to D7 CS* FS0/FS1 WR* DVDD Signals Not Connected & Left Open Circuited Include: RLOS/LOTC RLINK RLCLK RCHCLK RMSYNC RFSYNC TLCLK TCHCLK TCHBLK 8MCLK D0 to D7 CS* DVDD RCLK5/6/7/8 RPOS5/6/7/8 RNEG5/6/7/8 RSER5/6/7/8 RSIG5/6/7/8 RSYNC5/6/7/8 RCHBLK5/6/7/8 RSYSCLK5/6/7/8 TSYSCLK5/6/7/8 TCLK5/6/7/8 INT* JTRST TPOS5/6/7/8 TNEG5/6/7/8 JTMS JTCLK TSER5/6/7/8 TSIG5/6/7/8 JTDI JTDO TSSYNC5/6/7/8 TSYNC5/6/7/8 See Connecting Page 2 of 117 DS21FT44/DS21FF44 Figure 1-1. DS21FF44/DS21FT44 SCHEMATIC (continued) See Connecting Page DVSS DVSS CLKSI FMS TLINK0/1/2/3 TEST MUX BTS FS0/FS1 WR* RD* A0 to A7 D0 to D7 DVDD DS21Q44 # 3 Signals Not Connected & Left Open Circuited Include: RLOS/LOTC RLINK RCLK9/10/11/12 RLCLK RPOS9/10/11/12 RCHCLK RNEG9/10/11/12 RMSYNC RFSYNC RSER9/10/11/12 TLCLK RSIG9/10/11/12 TCHCLK RSYNC9/10/11/12 TCHBLK 8MCLK RCHBLK9/10/11/12 RSYSCLK9/10/11/12 TSYSCLK9/10/11/12 CS* INT* TCLK9/10/11/12 TPOS9/10/11/12 JTRST JTMS jtdot TNEG9/10/11/12 TSER9/10/11/12 JTCLK JTDI TSIG9/10/11/12 TSSYNC9/10/11/12 JTDO TSYNC9/10/11/12 DVSS DVSS CLKSI FMS TLINK0/1/2/3 TEST MUX BTS FS0/FS1 WR* RD* A0 to A7 D0 to D7 CS* INT* JTRST DVDD DS21Q44 # 4 Signals Not Connected & Left Open Circuited Include: RLOS/LOTC RLINK RCLK13/14/15/16 RLCLK RPOS13/14/15/16 RCHCLK RNEG13/14/15/16 RMSYNC RFSYNC RSER13/14/15/16 TLCLK RSIG13/14/15/16 TCHCLK RSYNC13/14/15/16 TCHBLK 8MCLK RCHBLK13/14/15/16 RSYSCLK13/14/15/16 TSYSCLK13/14/15/16 TCLK13/14/15/16 TPOS13/14/15/16 TNEG13/14/15/16 JTMS JTCLK jtdof JTDI JTDO TSER13/14/15/16 TSIG13/14/15/16 TSSYNC13/14/15/16 TSYNC13/14/15/16 The Fourth Quad Framer is Not Populated on the 12 Channel DS21FT44 3 of 117 DS21FT44/DS21FF44 TABLE OF CONTENTS 1. DESCRIPTION....................................................................................................................................1 2. MCM PIN DESCRIPTION ................................................................................................................7 3. DS21FF44 (4 x 4) PCB LAND PATTERNS ....................................................................................15 4. DS21FT44 (4 x 3) PCB Land Pattern ..............................................................................................16 5. DS21Q42 DIE DESCRIPTION ........................................................................................................17 6. DS21Q44 INTRODUCTION ............................................................................................................18 7. DS21Q44 PIN FUNCTION DESCRIPTION ..................................................................................20 8. DS21Q44 REGISTER MAP .............................................................................................................27 9. PARALLEL PORT ...........................................................................................................................32 10. CONTROL, ID, AND TEST REGISTERS.....................................................................................32 11. STATUS AND INFORMATION REGISTERS .............................................................................42 12. ERROR COUNT REGISTERS........................................................................................................50 13. DS0 MONITORING FUNCTION ...................................................................................................53 14. SIGNALING OPERATION .............................................................................................................56 14.1 PROCESSOR-BASED SIGNALING ...........................................................................................56 14.2 HARDWARE-BASED SIGNALING ...........................................................................................59 15. PER–CHANNEL CODE GENERATION AND LOOPBACK.....................................................60 15.1 TRANSMIT SIDE CODE GENERATION ..................................................................................60 15.1.1 Simple Idle Code Insertion and Per-Channel Loopback .......................................................60 15.1.2 Per-Channel Code Insertion..................................................................................................62 15.2 RECEIVE SIDE CODE GENERATION ......................................................................................62 16. CLOCK BLOCKING REGISTERS................................................................................................63 17. ELASTIC STORES OPERATION..................................................................................................64 17.1 RECEIVE SIDE.............................................................................................................................65 17.2 TRANSMIT SIDE .........................................................................................................................65 4 of 117 DS21FT44/DS21FF44 18. ADDITIONAL (Sa) AND INTERNATIONAL (Si) BIT OPERATION ......................................65 18.1 HARDWARE SCHEME ...............................................................................................................65 18.2 INTERNAL REGISTER SCHEME BASED ON DOUBLE–FRAME ........................................66 18.3 INTERNAL REGISTER SCHEME BASED ON CRC4 MULTIFRAME...................................68 19. HDLC CONTROLLER FOR THE SA BITS OR DS0 ..................................................................70 19.1 19.2 19.3 19.4 GENERAL OVERVIEW ..............................................................................................................70 HDLC STATUS REGISTERS ......................................................................................................71 BASIC OPERATION DETAILS ..................................................................................................72 HDLC REGISTER DESCRIPTION .............................................................................................73 20. INTERLEAVED PCM BUS OPERATION....................................................................................81 21. JTAG-BOUNDARY SCAN ARCHITECTURE AND TEST ACCESS PORT...........................84 21.1 DESCRIPTION .............................................................................................................................84 21.2 TAP CONTROLLER STATE MACHINE ...................................................................................85 21.3 INSTRUCTION REGISTER AND INSTRUCTIONS .................................................................87 21.4 TEST REGISTERS .......................................................................................................................89 22. TIMING DIAGRAMS.......................................................................................................................93 23. OPERATING PARAMETERS ......................................................................................................103 24. MCM PACKAGE DIMENSIONS .................................................................................................116 5 of 117 DS21FT44/DS21FF44 DOCUMENT REVISION HISTORY REVISION 080798 122998 101899 020300 120601 062602 NOTES Initial Release TEST and MUX pins were added at previous No Connect (NC) pins. DS21Q42 die specifications appended to data sheet. Conversion from Interleaf to Microsoft Word Updated DC Characteristics to show supply currents for DS21FT44/DS21FF44 Updated device characterization data 6 of 117 DS21FT44/DS21FF44 2. MCM PIN DESCRIPTION Table 2-1. PIN DESCRIPTION SORTED BY SYMBOL PIN B7 G20 H20 G19 H19 G18 H18 G17 H17 W15 B6 T8 Y4 Y15 E19 L20 M20 L19 M19 L18 M18 L17 M17 C7 E4 D2 K3 U7 P2 V19 T12 L16 D17 SYMBOL 8MCLK A0 A1 A2 A3 A4 A5 A6 A7 BTS CLKSI CS1* CS2* CS3* CS4*/NC D0 D1 D2 D3 D4 D5 D6 D7 DVDD1 DVDD1 DVDD1 DVDD2 DVDD2 DVDD2 DVDD3 DVDD3 DVDD3 DVDD4/NC F16 DVDD4/NC B11 DVDD4/NC E9 A6 D5 U3 K4 DVSS1 DVSS1 DVSS1 DVSS2 DVSS2 I/O O I I I I I I I I I I I I I I I/O I/O I/O I/O I/O I/O I/O I/O — — — — — — — — — — — — — — — — — DESCRIPTION 8.192 MHz Clock Based on CLKSI. Address Bus Bit 0 (lsb). Address Bus Bit 1. Address Bus Bit 2. Address Bus Bit 3. Address Bus Bit 4. Address Bus Bit 5. Address Bus Bit 6. Address Bus Bit 7 (msb). Bus Timing Select. 0 = Intel / 1 = Motorola. Reference clock for the 8.192MHz clock synthesizer. Chip Select for Quad Framer 1. Chip Select for Quad Framer 2. Chip Select for Quad Framer 3. Chip Select for Quad Framer 4. NC on Four x Three. Data Bus Bit 0 (lsb). Data Bus Bit 1. Data Bus Bit 2. Data Bus Bit 3. Data Bus Bit 4. Data Bus Bit 5. Data Bus Bit 6. Data Bus Bit 7 (msb). Digital Positive Supply for Framer 1. Digital Positive Supply for Framer 1. Digital Positive Supply for Framer 1. Digital Positive Supply for Framer 2. Digital Positive Supply for Framer 2. Digital Positive Supply for Framer 2. Digital Positive Supply for Framer 3. Digital Positive Supply for Framer 3. Digital Positive Supply for Framer 3. Digital Positive Supply for Framer 4. NC on Four x Three. Digital Positive Supply for Framer 4. NC on Four x Three. Digital Positive Supply for Framer 4. NC on Four x Three. Digital Signal Ground for Framer 1. Digital Signal Ground for Framer 1. Digital Signal Ground for Framer 1. Digital Signal Ground for Framer 2. Digital Signal Ground for Framer 2. 7 of 117 DS21FT44/DS21FF44 PIN U8 U4 R16 Y20 J20 A11 D19 Y14 W14 G16 V14 E10 A19 SYMBOL DVSS2 DVSS3 DVSS3 DVSS3 DVSS4/NC DVSS4/NC DVSS4/NC FS0 FS1 INT* JTCLK JTDI JTDOF/NC I/O — — — — — — — I I O I I O T17 H16 K17 A13 JTDOT JTMS JTRST* TEST O I I I P17 MUX I C2 G3 E6 A8 N1 Y1 U6 N5 Y8 W12 V17 U17 D16 K20 B18 B16 A2 K1 D10 B9 M3 V1 W6 J3 T9 RCHBLK1 RCHBLK2 RCHBLK3 RCHBLK4 RCHBLK5 RCHBLK6 RCHBLK7 RCHBLK8 RCHBLK9 RCHBLK10 RCHBLK11 RCHBLK12 RCHBLK13/NC RCHBLK14/NC RCHBLK15/NC RCHBLK16/NC RCLK1 RCLK2 RCLK3 RCLK4 RCLK5 RCLK6 RCLK7 RCLK8 RCLK9 O O O O O O O O O O O O O O O O I I I I I I I I I DESCRIPTION Digital Signal Ground for Framer 2. Digital Signal Ground for Framer 3. Digital Signal Ground for Framer 3. Digital Signal Ground for Framer 3. Digital Signal Ground for Framer 4. NC on Four x Three. Digital Signal Ground for Framer 4. NC on Four x Three. Digital Signal Ground for Framer 4. NC on Four x Three. Framer Select 0 for the Parallel Control Port. Framer Select 1 for the Parallel Control Port. Interrupt for all four Quad Framers. JTAG Clock. JTAG Data Input. JTAG Data Output for Four x Four Version. NC on Four x Three. JTAG Data Output for Four x Three Version. JTAG Test Mode Select. JTAG Reset. Tri-State. 0 = do not tri-state / 1 = tri-state all outputs & I/O signals Bus Operation Select. 0 = nonmultiplexed bus / 1 = multiplexed bus Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. Receive Channel Blocking Clock. NC on Four x Three. Receive Channel Blocking Clock. NC on Four x Three. Receive Channel Blocking Clock. NC on Four x Three. Receive Channel Blocking Clock. NC on Four x Three. Receive Clock for Framer 1 Receive Clock for Framer 2. Receive Clock for Framer 3. Receive Clock for Framer 4. Receive Clock for Framer 5. Receive Clock for Framer 6. Receive Clock for Framer 7. Receive Clock for Framer 8. Receive Clock for Framer 9. 8 of 117 DS21FT44/DS21FF44 PIN W10 Y18 N17 D14 P20 C18 C12 E18 B2 H2 D9 A9 M2 V3 V7 P3 U9 W11 W17 T20 E14 SYMBOL RCLK10 RCLK11 RCLK12 RCLK13/NC RCLK14/NC RCLK15/NC RCLK16/NC RD* RNEG1 RNEG2 RNEG3 RNEG4 RNEG5 RNEG6 RNEG7 RNEG8 RNEG9 RNEG10 RNEG11 RNEG12 RNEG13/NC I/O I I I I I I I I I I I I I I I I I I I I I N20 RNEG14/NC I C20 RNEG15/NC I B13 RNEG16/NC I A1 H1 H4 C9 M1 W2 V5 P4 T10 V11 Y19 R19 D15 RPOS1 RPOS2 RPOS3 RPOS4 RPOS5 RPOS6 RPOS7 RPOS8 RPOS9 RPOS10 RPOS11 RPOS12 RPOS13/NC I I I I I I I I I I I I I J18 RPOS14/NC I A20 RPOS15/NC I DESCRIPTION Receive Clock for Framer 10. Receive Clock for Framer 11. Receive Clock for Framer 12. Receive Clock for Framer 13. NC on Four x Three. Receive Clock for Framer 14. NC on Four x Three. Receive Clock for Framer 15. NC on Four x Three. Receive Clock for Framer 16. NC on Four x Three. Read Input. Receive Negative Data for Framer 1. Receive Negative Data for Framer 2. Receive Negative Data for Framer 3. Receive Negative Data for Framer 4. Receive Negative Data for Framer 5. Receive Negative Data for Framer 6. Receive Negative Data for Framer 7. Receive Negative Data for Framer 8. Receive Negative Data for Framer 9. Receive Negative Data for Framer 10. Receive Negative Data for Framer 11. Receive Negative Data for Framer 12. Receive Negative Data for Framer 13. NC on Four x Three. Receive Negative Data for Framer 14. NC on Four x Three. Receive Negative Data for Framer 15. NC on Four x Three. Receive Negative Data for Framer 16. NC on Four x Three. Receive Positive Data for Framer 1. Receive Positive Data for Framer 2. Receive Positive Data for Framer 3. Receive Positive Data for Framer 4. Receive Positive Data for Framer 5. Receive Positive Data for Framer 6. Receive Positive Data for Framer 7. Receive Positive Data for Framer 8. Receive Positive Data for Framer 9. Receive Positive Data for Framer 10. Receive Positive Data for Framer 11. Receive Positive Data for Framer 12. Receive Positive Data for Framer 13. NC on Four x Three. Receive Positive Data for Framer 14. NC on Four x Three. Receive Positive Data for Framer 15. NC on Four x Three. 9 of 117 DS21FT44/DS21FF44 PIN A14 SYMBOL RPOS16/NC I/O I C1 H3 C6 C8 P1 W4 T7 N4 U11 Y12 V16 T16 E16 F20 RSER1 RSER2 RSER3 RSER4 RSER5 RSER6 RSER7 RSER8 RSER9 RSER10 RSER11 RSER12 RSER13/NC RSER14/NC O O O O O O O O O O O O O O C16 RSER15/NC O A12 RSER16/NC O D3 G2 D4 D8 N2 V4 V6 K5 U10 Y11 W19 U20 E15 RSIG1 RSIG2 RSIG3 RSIG4 RSIG5 RSIG6 RSIG7 RSIG8 RSIG9 RSIG10 RSIG11 RSIG12 RSIG13/NC O O O O O O O O O O O O O K19 RSIG14/NC O C17 RSIG15/NC O A15 RSIG16/NC O B1 G1 D6 A7 N3 Y2 RSYNC1 RSYNC2 RSYNC3 RSYNC4 RSYNC5 RSYNC6 I/O I/O I/O I/O I/O I/O DESCRIPTION Receive Positive Data for Framer 16. NC on Four x Three. Receive Serial Data from Framer 1. Receive Serial Data from Framer 2. Receive Serial Data from Framer 3. Receive Serial Data from Framer 4. Receive Serial Data from Framer 5. Receive Serial Data from Framer 6. Receive Serial Data from Framer 7. Receive Serial Data from Framer 8. Receive Serial Data from Framer 9. Receive Serial Data from Framer 10. Receive Serial Data from Framer 11. Receive Serial Data from Framer 12. Receive Serial Data from Framer 13. NC on Four x Three. Receive Serial Data from Framer 14. NC on Four x Three. Receive Serial Data from Framer 15. NC on Four x Three. Receive Serial Data from Framer 16. NC on Four x Three. Receive Signaling Output from Framer 1. Receive Signaling Output from Framer 2. Receive Signaling Output from Framer 3. Receive Signaling Output from Framer 4. Receive Signaling Output from Framer 5. Receive Signaling Output from Framer 6. Receive Signaling Output from Framer 7. Receive Signaling Output from Framer 8. Receive Signaling Output from Framer 9. Receive Signaling Output from Framer 10. Receive Signaling Output from Framer 11. Receive Signaling Output from Framer 12. Receive Signaling Output from Framer 13. NC on Four x Three. Receive Signaling Output from Framer 14. NC on Four x Three. Receive Signaling Output from Framer 15. NC on Four x Three. Receive Signaling Output from Framer 16. NC on Four x Three. Receive Frame/Multiframe Sync for Framer 1. Receive Frame/Multiframe Sync for Framer 2. Receive Frame/Multiframe Sync for Framer 3. Receive Frame/Multiframe Sync for Framer 4. Receive Frame/Multiframe Sync for Framer 5. Receive Frame/Multiframe Sync for Framer 6. 10 of 117 DS21FT44/DS21FF44 PIN U5 J4 T11 V13 V15 P18 J17 SYMBOL RSYNC7 RSYNC8 RSYNC9 RSYNC10 RSYNC11 RSYNC12 RSYNC13/NC I/O I/O I/O I/O I/O I/O I/O I/O J19 RSYNC14/NC I/O B17 RSYNC15/NC I/O B12 RSYNC16/NC I/O B5 E2 E5 B8 M4 T2 Y5 W3 T4 Y9 U12 R17 E13 N18 E20 C14 D1 H5 C5 A5 R1 Y3 T6 K2 SYSCLK1 SYSCLK2 SYSCLK3 SYSCLK4 SYSCLK5 SYSCLK6 SYSCLK7 SYSCLK8 SYSCLK9 SYSCLK10 SYSCLK11 SYSCLK12 SYSCLK13/NC SYSCLK14/NC SYSCLK15/NC SYSCLK16/NC TCLK1 TCLK2 TCLK3 TCLK4 TCLK5 TCLK6 TCLK7 TCLK8 I I I I I I I I I I I I I I I I I I I I I I I I DESCRIPTION Receive Frame/Multiframe Sync for Framer 7. Receive Frame/Multiframe Sync for Framer 8. Receive Frame/Multiframe Sync for Framer 9. Receive Frame/Multiframe Sync for Framer 10. Receive Frame/Multiframe Sync for Framer 11. Receive Frame/Multiframe Sync for Framer 12. Receive Frame/Multiframe Sync for Framer 13. NC on Four x Three. Receive Frame/Multiframe Sync for Framer 14. NC on Four x Three. Receive Frame/Multiframe Sync for Framer 15. NC on Four x Three. Receive Frame/Multiframe Sync for Framer 16. NC on Four x Three. System Clock for Framer 1. System Clock for Framer 2. System Clock for Framer 3. System Clock for Framer 4. System Clock for Framer 5. System Clock for Framer 6. System Clock for Framer 7. System Clock for Framer 8. System Clock for Framer 9. System Clock for Framer 10. System Clock for Framer 11. System Clock for Framer 12. System Clock for Framer 13. NC on Four x Three. System Clock for Framer 14. NC on Four x Three. System Clock for Framer 15. NC on Four x Three. System Clock for Framer 16. NC on Four x Three. Transmit Clock for Framer 1. Transmit Clock for Framer 2. Transmit Clock for Framer 3. Transmit Clock for Framer 4. Transmit Clock for Framer 5. Transmit Clock for Framer 6. Transmit Clock for Framer 7. Transmit Clock for Framer 8. U13 Y13 T18 P16 K16 F19 E17 C11 TCLK9 TCLK10 TCLK11 TCLK12 TCLK13/NC TCLK14/NC TCLK15/NC TCLK16/NC I I I I I I I I Transmit Clock for Framer 9. Transmit Clock for Framer 10. Transmit Clock for Framer 11. Transmit Clock for Framer 12. Transmit Clock for Framer 13. Transmit Clock for Framer 14. Transmit Clock for Framer 15. Transmit Clock for Framer 16. 11 of 117 NC on Four x Three. NC on Four x Three. NC on Four x Three. NC on Four x Three. DS21FT44/DS21FF44 PIN C3 J1 F5 A10 L1 V2 V8 P5 U14 V12 W18 T19 D11 SYMBOL TNEG1 TNEG2 TNEG3 TNEG4 TNEG5 TNEG6 TNEG7 TNEG8 TNEG9 TNEG10 TNEG11 TNEG12 TNEG13/NC I/O O O O O O O O O O O O O O K18 TNEG14/NC O C19 TNEG15/NC O B15 TNEG16/NC O B3 J2 J5 B10 L2 W1 W7 R3 T14 Y10 V18 V20 E12 TPOS1 TPOS2 TPOS3 TPOS4 TPOS5 TPOS6 TPOS7 TPOS8 TPOS9 TPOS10 TPOS11 TPOS12 TPOS13/NC O O O O O O O O O O O O O N19 TPOS14/NC O B19 TPOS15/NC O B14 TPOS16/NC O B4 E1 F3 D7 L5 T1 Y6 TSER1 TSER2 TSER3 TSER4 TSER5 TSER6 TSER7 I I I I I I I DESCRIPTION Transmit Negative Data from Framer 1. Transmit Negative Data from Framer 2. Transmit Negative Data from Framer 3. Transmit Negative Data from Framer 4. Transmit Negative Data from Framer 5. Transmit Negative Data from Framer 6. Transmit Negative Data from Framer 7. Transmit Negative Data from Framer 8. Transmit Negative Data from Framer 9. Transmit Negative Data from Framer 10. Transmit Negative Data from Framer 11. Transmit Negative Data from Framer 12. Transmit Negative Data from Framer 13. NC on Four x Three. Transmit Negative Data from Framer 14. NC on Four x Three. Transmit Negative Data from Framer 15. NC on Four x Three. Transmit Negative Data from Framer 16. NC on Four x Three. Transmit Positive Data from Framer 1. Transmit Positive Data from Framer 2. Transmit Positive Data from Framer 3. Transmit Positive Data from Framer 4. Transmit Positive Data from Framer 5. Transmit Positive Data from Framer 6. Transmit Positive Data from Framer 7. Transmit Positive Data from Framer 8. Transmit Positive Data from Framer 9. Transmit Positive Data from Framer 10. Transmit Positive Data from Framer 11. Transmit Positive Data from Framer 12. Transmit Positive Data from Framer 13. NC on Four x Three. Transmit Positive Data from Framer 14. NC on Four x Three. Transmit Positive Data from Framer 15. NC on Four x Three. Transmit Positive Data from Framer 16. NC on Four x Three. Transmit Serial Data for Framer 1. Transmit Serial Data for Framer 2. Transmit Serial Data for Framer 3. Transmit Serial Data for Framer 4. Transmit Serial Data for Framer 5. Transmit Serial Data for Framer 6. Transmit Serial Data for Framer 7. 12 of 117 DS21FT44/DS21FF44 PIN T3 M16 W9 W16 W20 D13 F17 D18 A18 C4 F1 G4 C10 L3 U2 V9 R5 U15 V10 U18 R18 E11 SYMBOL TSER8 TSER9 TSER10 TSER11 TSER12 TSER13/NC TSER14/NC TSER15/NC TSER16/NC TSIG1 TSIG2 TSIG3 TSIG4 TSIG5 TSIG6 TSIG7 TSIG8 TSIG9 TSIG10 TSIG11 TSIG12 TSIG13/NC I/O I I I I I I I I I I I I I I I I I I I I I I P19 TSIG14/NC I B20 TSIG15/NC I A16 TSIG16/NC I A3 F2 G5 E8 L4 U1 Y7 R4 T15 W8 Y17 U19 C13 TSSYNC1 TSSYNC2 TSSYNC3 TSSYNC4 TSSYNC5 TSSYNC6 TSSYNC7 TSSYNC8 TSSYNC9 TSSYNC10 TSSYNC11 TSSYNC12 TSSYNC13/NC I I I I I I I I I I I I I R20 TSSYNC14/NC I D20 TSSYNC15/NC I DESCRIPTION Transmit Serial Data for Framer 8. Transmit Serial Data for Framer 9. Transmit Serial Data for Framer 10. Transmit Serial Data for Framer 11. Transmit Serial Data for Framer 12. Transmit Serial Data for Framer 13. NC on Four x Three. Transmit Serial Data for Framer 14. NC on Four x Three. Transmit Serial Data for Framer 15. NC on Four x Three. Transmit Serial Data for Framer 16. NC on Four x Three. Transmit Signaling Input for Framer 1. Transmit Signaling Input for Framer 2. Transmit Signaling Input for Framer 3. Transmit Signaling Input for Framer 4. Transmit Signaling Input for Framer 5. Transmit Signaling Input for Framer 6. Transmit Signaling Input for Framer 7. Transmit Signaling Input for Framer 8. Transmit Signaling Input for Framer 9. Transmit Signaling Input for Framer 10. Transmit Signaling Input for Framer 11. Transmit Signaling Input for Framer 12. Transmit Signaling Input for Framer 13. NC on Four x Three. Transmit Signaling Input for Framer 14. NC on Four x Three. Transmit Signaling Input for Framer 15. NC on Four x Three. Transmit Signaling Input for Framer 16. NC on Four x Three. Transmit System Sync for Framer 1. Transmit System Sync for Framer 2. Transmit System Sync for Framer 3. Transmit System Sync for Framer 4. Transmit System Sync for Framer 5. Transmit System Sync for Framer 6. Transmit System Sync for Framer 7. Transmit System Sync for Framer 8. Transmit System Sync for Framer 9. Transmit System Sync for Framer 10. Transmit System Sync for Framer 11. Transmit System Sync for Framer 12. Transmit System Sync for Framer 13. NC on Four x Three. Transmit System Sync for Framer 14. NC on Four x Three. Transmit System Sync for Framer 15. NC on Four x Three. 13 of 117 DS21FT44/DS21FF44 PIN A17 SYMBOL TSSYNC16/NC I/O I E3 F4 E7 A4 R2 W5 T5 M5 T13 W13 U16 N16 J16 F18 C15 D12 Y16 TSYNC1 TSYNC2 TSYNC3 TSYNC4 TSYNC5 TSYNC6 TSYNC7 TSYNC8 TSYNC9 TSYNC10 TSYNC11 TSYNC12 TSYNC13/NC TSYNC14/NC TSYNC15/NC TSYNC16/NC WR* I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I DESCRIPTION Transmit System Sync for Framer 16. NC on Four x Three. Transmit Sync for Framer 1. Transmit Sync for Framer 2. Transmit Sync for Framer 3. Transmit Sync for Framer 4. Transmit Sync for Framer 5. Transmit Sync for Framer 6. Transmit Sync for Framer 7. Transmit Sync for Framer 8. Transmit Sync for Framer 9. Transmit Sync for Framer 10. Transmit Sync for Framer 11. Transmit Sync for Framer 12. Transmit Sync for Framer 13. NC on Four x Three. Transmit Sync for Framer 14. NC on Four x Three. Transmit Sync for Framer 15. NC on Four x Three. Transmit Sync for Framer 16. NC on Four x Three. Write Input. 14 of 117 DS21FT44/DS21FF44 3. DS21FF44 (4 X 4) PCB LAND PATTERNS The diagram shown below is the pin pattern that is placed on the target PCB. This is the same pattern that would be seen as viewed through the MCM from the top. Figure 3-1. PIN PATTERN FOR TARGET PCB (4 X 4) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A rpos 1 rclk 1 ts sync1 tsync 4 tclk 4 dvss 1 rsync 4 rneg 4 tneg 4 dvss 4 rser 16 test rpos 16 rsig 16 tsig 16 jtdof rpos 15 rsync 1 rneg 1 tpos 1 tser 1 clksi 8 mclk rclk 4 tpos 4 dvdd 4 rsync 16 rneg 16 tpos 16 tneg 16 tneg 1 tsig 1 rser 3 dvdd 1 rpos 4 tsig 4 tclk 16 rclk 16 tneg 15 rneg 15 rsig 1 rsig 3 dvss 1 rsync 3 tser 4 rsig4 rneg 3 rclk 3 tneg 13 tsync 16 sys clk 16 rclk 13 rsig 15 tclk 1 ts sync 13 tser 13 tsync 15 D rch blk 1 dvdd 1 rch blk 15 rclk 15 tsig 15 rser 1 rch blk 16 rser 15 tpos 15 C sys clk 1 tclk 3 ts sync 16 rsync 15 tser 16 B rch blk 4 sys clk 4 rser4 dvdd 4 tser 15 dvss 4 E tser 2 tsync 1 dvdd 1 tsync 3 ts sync 4 dvss 1 jtdi tsig 13 tpos 13 sys clk 13 rneg 13 rsig 13 tclk 15 rd* cs4* tsig 2 tser 3 tsync 2 sys clk 3 tneg 3 rch blk 3 F dvdd 4 tser 14 tsync 14 tclk 14 ts sync 15 sys clk 15 rser 14 G rsync 2 sys clk 2 ts sync 2 rsig 2 rch blk 13 rser 13 tsig 3 A6 A4 A2 A0 rpos 2 rneg 2 rpos 3 ts sync 3 tclk 2 int* H rch blk 2 rser 2 jtms A7 A5 A3 A1 J tneg 2 tpos 2 rclk 8 rsync 8 tpos 3 tsync 13 rsync 13 rpos 14 rsync 14 dvss 4 K rclk 2 tclk 8 dvdd 2 dvss 2 rsig 8 tclk 13 jtrst* tneg 14 rsig 14 L tneg 5 tpos 5 tsig 5 tser 5 dvdd 3 D6 D4 D2 M rpos 5 rneg 5 rclk 5 tsync 8 tser 9 D7 D5 D3 D1 N rsig 5 rsync 5 rclk 12 rneg 14 rneg 8 rpos 8 tclk 12 mux sys clk 14 rsync 12 tpos 14 dvdd 2 rch blk 8 tneg 8 tsync 12 P rch blk 5 rser 5 ts sync 5 sys clk 5 rser 8 rch blk 14 D0 tsig 14 rclk 14 R tclk 5 tsync 5 tpos 8 tsig 8 dvss 3 rpos 12 tser 6 tser 8 tsync 7 tclk 7 rser 7 cs1* rclk 9 rpos 9 rsync 9 dvdd 3 tsync 9 tpos 9 tclk 11 tneg 12 ts sync 14 rneg 12 U dvss 2 rsync 7 dvss 2 rneg 9 rsig 9 rser 9 tneg 9 tssync 12 rsig 12 rsig 6 rpos 7 rneg 7 tneg 7 tsig 7 tsig 10 rpos 10 rsync 10 tpos 11 dvdd 3 tpos 12 W tpos 6 rpos 6 rser 6 tsync 6 rclk 7 tpos 7 rclk 10 rneg 10 tneg 11 rsig 11 tser 12 rch blk 6 rsync 6 cs2* sys clk 7 tser 7 ts sync 7 ts sync 10 rch blk 9 tser 10 Y sys clk 8 tclk 6 rch blk 12 rch blk 11 rneg 11 tsig 11 rneg 6 sys clk 11 tneg 10 tclk 9 tneg 6 rch blk 7 rsig 7 dvdd 2 V ts sync 6 rclk 6 sys clk 6 tsig 6 sys clk 12 jtdot tsig 12 T ts sync 8 sys clk 9 dvss 3 sys clk 10 tpos 10 rsig 10 rclk 11 rpos 11 dvss 3 15 of 117 rch blk 10 rser 10 rpos 13 ts sync 9 tsig 9 tsync 11 jtclk rsync 11 rser 11 tsync 10 fs1 bts tser 11 tclk 10 fs0 cs3* wr* rser 12 ts sync 11 DS21FT44/DS21FF44 4. DS21FT44 (Four x Three) PCB Land Pattern The diagram shown below is the pin pattern that is placed on the target PCB. This is the same pattern that would be seen as viewed through the MCM from the top. Figure 4-1. PIN PATTERN FOR TARGET PCB (4 X 3) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A rpos 1 rclk 1 ts sync1 tsync 4 tclk 4 dvss 1 rsync 4 rneg 4 tneg 4 nc nc test ns ns nc nc nc nc nc B rsync 1 rneg 1 tpos 1 tser 1 clksi 8 mclk rclk 4 tpos 4 nc nc nc nc nc nc nc nc nc nc C rser 1 tneg 1 tsig 1 rser 3 dvdd 1 rpos 4 tsig 4 nc nc nc nc ns nc nc nc nc nc D tclk 1 rch blk 1 dvdd 1 sys clk 1 tclk 3 rch blk 4 sys clk 4 rser4 rsig 1 rsig 3 dvss 1 rsync 3 tser 4 rsig4 rneg 3 rclk 3 nc nc nc nc nc nc nc nc nc nc E tser 2 tsync 1 dvdd 1 tsync 3 ts sync 4 dvss 1 jtdi nc nc nc nc nc nc nc rd* nc nc tsig 2 tser 3 tsync 2 sys clk 3 tneg 3 rch blk 3 F nc nc nc nc nc G rsync 2 sys clk 2 ts sync 2 rsig 2 tsig 3 A6 A4 A2 A0 rpos 2 rneg 2 rpos 3 ts sync 3 tclk 2 int* H rch blk 2 rser 2 jtms A7 A5 A3 A1 J tneg 2 tpos 2 rclk 8 rsync 8 tpos 3 nc nc nc nc nc K rclk 2 tclk 8 dvdd 2 dvss 2 rsig 8 nc jtrst* nc nc nc L tneg 5 tpos 5 tsig 5 tser 5 dvdd 3 D6 D4 D2 D0 M rpos 5 rneg 5 rclk 5 tsync 8 tser 9 D7 D5 D3 D1 N rsig 5 rsync 5 rclk 12 nc nc nc dvdd 2 rneg 8 rpos 8 rch blk 8 tneg 8 tsync 12 P rch blk 5 rser 5 ts sync 5 sys clk 5 rser 8 tclk 12 mux rsync 12 nc nc R tclk 5 tsync 5 tpos 8 tsig 8 dvss 3 rpos 12 nc tser 6 tser 8 tsync 7 tclk 7 rser 7 cs1* rclk 9 rpos 9 rsync 9 dvdd 3 tsync 9 tpos 9 tclk 11 tneg 12 rneg 12 U dvss 2 rsync 7 dvss 2 rneg 9 rsig 9 rser 9 tneg 9 tssync 12 rsig 12 rsig 6 rpos 7 rneg 7 tneg 7 tsig 7 tsig 10 rpos 10 rsync 10 tpos 11 dvdd 3 tpos 12 W tpos 6 rpos 6 rser 6 tsync 6 rclk 7 tpos 7 rclk 10 rneg 10 tneg 11 rsig 11 tser 12 rch blk 6 rsync 6 cs2* sys clk 7 tser 7 ts sync 7 ts sync 10 rch blk 9 tser 10 Y sys clk 8 tclk 6 rch blk 12 rch blk 11 rneg 11 tsig 11 rneg 6 sys clk 11 tneg 10 tclk 9 tneg 6 rch blk 7 rsig 7 dvdd 2 V ts sync 6 rclk 6 sys clk 6 tsig 6 sys clk 12 jtdot tsig 12 T ts sync 8 sys clk 9 dvss 3 sys clk 10 tpos 10 rsig 10 rclk 11 rpos 11 dvss 3 16 of 117 rch blk 10 rser 10 ts sync 9 tsig 9 rser 12 tsync 11 jtclk rsync 11 rser 11 tsync 10 fs1 bts tser 11 tclk 10 fs0 cs3* wr* ts sync 11 DS21FT44/DS21FF44 5. DS21Q44 DIE DESCRIPTION FEATURES § § § § § § § § § § § § § § § FUNCTIONAL DIAGRAM Four E1 (CEPT or PCM-30)/ISDN-PRI framing transceivers All four framers are fully independent; transmit and receive sections of each framer are fully independent Frames to FAS, CAS, CCS, and CRC4 formats Each of the four framers contain dual twoframe elastic store slip buffers that can connect to asynchronous backplanes up to 8.192MHz 8-bit parallel control port that can be used directly on either multiplexed or nonmultiplexed buses (Intel or Motorola) Easy access to Si and Sa bits Extracts and inserts CAS signaling Large counters for bipolar and code violations, CRC4 code word errors, FAS word errors, and E-bits Programmable output clocks for Fractional E1, per channel loopback, H0 and H12 applications Integral HDLC controller with 64-byte buffers configurable for Sa bits or DS0 operation Detects and generates AIS, remote alarm, and remote multiframe alarms Pin compatible with DS21Q42 enhanced quad T1 framer 3.3V supply with 5V tolerant I/O; low-power CMOS Available in 128-pin TQFP package IEEE 1149.1 support Receive Framer Elastic Store Transmit Formatter Elastic Store FRAMER #0 FRAMER #1 FRAMER #2 FRAMER #3 Control Port DESCRIPTION The DS21Q44 E1 is an enhanced version of the DS21Q43 quad E1 framer. The DS21Q44 contains four framers that are configured and read through a common microprocessor-compatible parallel port. Each framer consists of a receive framer, receive elastic store, transmit formatter, and transmit elastic store. All four framers in the DS21Q44 are totally independent; they do not share a common framing synchronizer. The transmit and receive sides of each framer are also totally independent. The dual two-frame elastic stores contained in each of the four framers can be independently enabled and disabled as required. The device fully meets all of the latest E1 specifications including CCITT/ITU G.704, G.706, G.962, and I.431 as well as ETS 300 011 and ETS 300 233. 17 of 117 DS21FT44/DS21FF44 6. DS21Q44 INTRODUCTION The DS21Q44 is a superset version of the popular DS21Q43 quad E1 framer offering the new features listed below. All of the original features of the DS21Q43 have been retained and software created for the original device is transferable to the DS21Q44. NEW FEATURES § § § § § § § § § Additional hardware signaling capability including: – receive signaling reinsertion to a backplane multiframe sync – availability of signaling in a separate PCM data stream – signaling freezing – interrupt generated on change of signaling data Per–channel code insertion in both transmit and receive paths Full HDLC controller with 64-byte buffers in both transmit and receive paths. Configurable for Sa bits or DS0 access RCL, RLOS, RRA, and RUA1 alarms now interrupt on change of state 8.192MHz clock synthesizer Ability to monitor one DS0 channel in both the transmit and receive paths Option to extend carrier loss criteria to a 1 ms period as per ETS 300 233 Automatic RAI generation to ETS 300 011 specifications IEEE 1149.1 support FUNCTIONAL DESCRIPTION The receive side in each framer locates FAS frame and CRC and CAS multiframe boundaries as well as detects incoming alarms including, carrier loss, loss of synchronization, AIS and Remote Alarm. If needed, the receive side elastic store can be enabled in order to absorb the phase and frequency differences between the recovered E1 data stream and an asynchronous backplane clock, which is provided at the RSYSCLK input. The clock applied at the RSYSCLK input can be either a 2.048 MHz clock or a 1.544 MHz clock. The RSYSCLK can be a burst clock with speeds up to 8.192 MHz. The transmit side in each framer is totally independent from the receive side in both the clock requirements and characteristics. Data off of a backplane can be passed through a transmit side elastic store if necessary. The transmit formatter will provide the necessary frame/multiframe data overhead for E1 transmission. READER’S NOTE: This data sheet assumes a particular nomenclature of the E1 operating environment. In each 125µs frame, there are 32 8-bit timeslots numbered 0 to 31. Timeslot 0 is transmitted first and received first. These 32 timeslots are also referred to as channels with a numbering scheme of 1 to 32. Timeslot 0 is identical to channel 1, timeslot 1 is identical to Channel 2, and so on. Each timeslot (or channel) is made up of 8 bits, which are numbered 1 to 8. Bit number 1 is the MSB and is transmitted first. Bit number 8 is the LSB and is transmitted last. Throughout this data sheet, the following abbreviations are used: FAS CAS MF Si Frame Alignment Signal Channel Associated Signaling Multiframe International bits CRC4 CCS Sa E-bit 18 of 117 Cyclical Redundancy Check Common Channel Signaling Additional bits CRC4 Error Bits DS21FT44/DS21FF44 Figure 6-1. DS21Q44 ENHANCED QUAD E1 FRAMER RLOS/LOTC 1 64-Byte Buffer HDLC Engine DS0 Insertion RLINK RLCLK Sa Extraction RCHBLK RCHCLK 1 Timing Control Signaling Buffer Signaling Extraction SA and SI Extraction FAS Error Counter E-BIT Counter Per-Channel Code Insert Remote Loopback Framer Loopback RNEG CRC Error Counter RPOS RCLK BPV Counter Synchronizer Alarm Detection HDB3 Decoder Receive Side Framer RSIG RSER data clock sync RSYSCLK RSYNC RMSYNC 1 Elastic Store RFSYNC TSYNC Sync Control Per-Channel Code Insert FAS Word Insertion Per-Channel Loopback SI Bit Insertion Signaling Insertion SA Insertion E-Bit Insertion TNEG HDB3 Encode CRC4 Generation AIS Generation TPOS TCHBLK Timing Control Transmit Side Formatter sync clock TCHCLK TSSYNC Elastic Store data TSYSCLK Hardware Signaling Insertion TSER TSIG LOTC DET & MUX 64-Byte Buffer TCLK HDLC Engine DS0 Insertion TLINK TLCLK Sa Insertion FRAMER #0 FRAMER #1 FRAMER #2 FRAMER #3 8.192MHz Clock Synthesizer CLKS I VDD VSS 8MCLK JTRST* 3 JTMS Power 3 JTCLK JTAG Port JTDI JTDO Parallel & Test Control Port (routed to all blocks) 8 7 TEST CS* FS0 FS1 BTS WR* (R/W*) RD* (DS*) ALE (AS)/ A6 A0 to A5, A7 Note: 1. Alternate pin functions. Consult data sheet for restrictions. 19 of 117 MUX 1 D0 to D7 / AD0 to AD7 FMS INT* DS21FT44/DS21FF44 7. DS21Q44 PIN FUNCTION DESCRIPTION This section describes the signals on the DS21Q44 die. Signals that are not bonded out or have limited functionality in the DS21FT44 and DS21FF44 are noted in italics. TRANSMIT SIDE PINS Signal Name: TCLK Signal Description: Transmit Clock Signal Type: Input A 2.048MHz primary clock. Used to clock data through the transmit side formatter. Signal Name: TSER Signal Description: Transmit Serial Data Signal Type: Input Transmit NRZ serial data. Sampled on the falling edge of TCLK when the transmit side elastic store is disabled. Sampled on the falling edge of TSYSCLK when the transmit side elastic store is enabled. Signal Name: TCHCLK Signal Description: Transmit Channel Clock Signal Type: Output A 256kHz clock that pulses high during the LSB of each channel. Synchronous with TCLK when the transmit side elastic store is disabled. Synchronous with TSYSCLK when the transmit side elastic store is enabled. Useful for parallel to serial conversion of channel data. This function is available when FMS = 1 (DS21Q43 emulation). This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: TCHBLK Signal Description: Transmit Channel Block Signal Type: Output A user-programmable output that can be forced high or low during any of the 32 E1 channels. Synchronous with TCLK when the transmit side elastic store is disabled. Synchronous with TSYSCLK when the transmit side elastic store is enabled. Useful for blocking clocks to a serial UART or LAPD controller in applications where not all E1 channels are used such as Fractional E1, 384kbps (H0), 768kbps, 1920kbps (H12) or ISDN–PRI. Also useful for locating individual channels in drop-and-insert applications, for external per-channel loopback, and for per-channel conditioning. See Section 16 for details. This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: TSYSCLK Signal Description: Transmit System Clock Signal Type: Input 1.544MHz or 2.048MHz clock. Only used when the transmit side elastic store function is enabled. Should be connected low in applications that do not use the transmit side elastic store. Can be burst at rates up to 8.192MHz. This pin is connected to the RSYSCLK signal in the DS21FF44/DS21FT44. Signal Name: TLCLK Signal Description: Transmit Link Clock Signal Type: Output 4kHz to 20kHz demand clock for the TLINK input. See Section 18 for details. This signal is not bonded out in the DS21FF44/DS21FT44. 20 of 117 DS21FT44/DS21FF44 Signal Name: TLINK Signal Description: Transmit Link Data Signal Type: Input If enabled, this pin will be sampled on the falling edge of TCLK for data insertion into any combination of the Sa bit positions (Sa4 to Sa8). See Section 18 for details. This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: TSYNC Signal Description: Transmit Sync Signal Type: Input /Output A pulse at this pin will establish either frame or multiframe boundaries for the transmit side. This pin can also be programmed to output either a frame or multiframe pulse. Always synchronous with TCLK. Signal Name: TSSYNC Signal Description: Transmit System Sync Signal Type: Input Only used when the transmit side elastic store is enabled. A pulse at this pin will establish either frame or multiframe boundaries for the transmit side. Should be connected low in applications that do not use the transmit side elastic store. Always synchronous with TSYSCLK. Signal Name: TSIG Signal Description: Transmit Signaling Input Signal Type: Input When enabled, this input will sample signaling bits for insertion into outgoing PCM E1 data stream. Sampled on the falling edge of TCLK when the transmit side elastic store is disabled. Sampled on the falling edge of TSYSCLK when the transmit side elastic store is enabled. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: TPOS Signal Description: Transmit Positive Data Output Signal Type: Output Updated on the rising edge of TCLK with the bipolar data out of the transmit side formatter. Can be programmed to source NRZ data by the Output Data Format (TCR1.7) control bit. Signal Name: TNEG Signal Description: Transmit Negative Data Output Signal Type: Output Updated on the rising edge of TCLK with the bipolar data out of the transmit side formatter. RECEIVE SIDE PINS Signal Name: RLINK Signal Description: Receive Link Data Signal Type: Output Updated with full recovered E1 data stream on the rising edge of RCLK. This signal is not bonded out in the DS21FF44/DS21FT44. 21 of 117 DS21FT44/DS21FF44 Signal Name: RLCLK Signal Description: Receive Link Clock Signal Type: Output A 4kHz to 20kHz clock for the RLINK output. Used for sampling Sa bits. This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: RCLK Signal Description: Receive Clock Input Signal Type: Input 2.048MHz clock that is used to clock data through the receive side framer. Signal Name: RCHCLK Signal Description: Receive Channel Clock Signal Type: Output A 256kHz clock that pulses high during the LSB of each channel. Synchronous with RCLK when the receive side elastic store is disabled. Synchronous with RSYSCLK when the receive side elastic store is enabled. Useful for parallel to serial conversion of channel data. This function is available when FMS = 1 (DS21Q43 emulation). This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: RCHBLK Signal Description: Receive Channel Block Signal Type: Output A user programmable output that can be forced high or low during any of the 32 E1 channels. Synchronous with RCLK when the receive side elastic store is disabled. Synchronous with RSYSCLK when the receive side elastic store is enabled. Useful for blocking clocks to a serial UART or LAPD controller in applications where not all E1 channels are used such as Fractional E1, 384kbps service, 768kbps, or ISDN–PRI. Also useful for locating individual channels in drop-and-insert applications, for external per-channel loopback, and for per-channel conditioning. See Section 16 for details. Signal Name: RSER Signal Description: Receive Serial Data Signal Type: Output Received NRZ serial data. Updated on rising edges of RCLK when the receive side elastic store is disabled. Updated on the rising edges of RSYSCLK when the receive side elastic store is enabled. Signal Name: RSYNC Signal Description: Receive Sync Signal Type: Input /Output An extracted pulse, one RCLK wide, is output at this pin, which identifies either frame or CAS/CRC multiframe boundaries. If the receive side elastic store is enabled, then this pin can be enabled to be an input at which a frame or multiframe boundary pulse synchronous with RSYSCLK is applied. Signal Name: RFSYNC Signal Description: Receive Frame Sync Signal Type: Output An extracted 8kHz pulse, one RCLK wide, is output at this pin, which identifies frame boundaries. This signal is not bonded out in the DS21FF44/DS21FT44. 22 of 117 DS21FT44/DS21FF44 Signal Name: RMSYNC Signal Description: Receive Multiframe Sync Signal Type: Output An extracted pulse, one RSYSCLK wide, is output at this pin, which identifies multiframe boundaries. If the receive side elastic store is disabled, then this output will output multiframe boundaries associated with RCLK. This function is available when FMS = 1 (DS21Q43 emulation). This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: RSYSCLK Signal Description: Receive System Clock Signal Type: Input 1.544MHz or 2.048MHz clock. Only used when the elastic store function is enabled. Should be connected low in applications that do not use the elastic store. Can be burst at rates up to 8.192MHz. This pin is connected to the TSYSCLK signal in the DS21FF44/DS21FT44. Signal Name: RSIG Signal Description: Receive Signaling Output Signal Type: Output Outputs signaling bits in a PCM format. Updated on rising edges of RCLK when the receive side elastic store is disabled. Updated on the rising edges of RSYSCLK when the receive side elastic store is enabled. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: RLOS/LOTC Signal Description: Receive Loss of Sync / Loss of Transmit Clock Signal Type: Output A dual function output that is controlled by the TCR2.0 control bit. This pin can be programmed to either toggle high when the synchronizer is searching for the frame and multiframe or to toggle high if the TCLK pin has not been toggled for 5µs. This function is available when FMS = 1 (DS21Q43 emulation). This signal is not bonded out in the DS21FF44/DS21FT44. Signal Name: CLKSI Signal Description: 8MHz Clock Reference Signal Type: Input A 2.048MHz reference clock used in the generation of 8MCLK. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: 8MCLK Signal Description: 8 MHz Clock Signal Type: Output An 8.192MHz output clock that is referenced to the clock that is input at the CLKSI pin. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: RPOS Signal Description: Receive Positive Data Input Signal Type: Input Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and RNEG can be connected together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar violation monitoring circuitry. 23 of 117 DS21FT44/DS21FF44 Signal Name: RNEG Signal Description: Receive Negative Data Input Signal Type: Input Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and RNEG can be connected together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar violation monitoring circuitry. PARALLEL CONTROL PORT PINS Signal Name: INT* Signal Description: Interrupt Signal Type: Output Flags host controller during conditions and change of conditions defined in the Status Registers 1 and 2 and the FDL Status Register. Active-low, open-drain output. Signal Name: FMS Signal Description: Framer Mode Select Signal Type: Input Set low to select DS21Q44 feature set. Set high to select DS21Q43 emulation. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: MUX Signal Description: Bus Operation Signal Type: Input Set low to select nonmultiplexed bus operation. Set high to select multiplexed bus operation. Signal Name: D0 to D7 / AD0 to AD7 Signal Description: Data Bus or Address/Data Bus Signal Type: Input /Output In nonmultiplexed bus operation (MUX = 0), serves as the data bus. In multiplexed bus operation (MUX = 1), serves as an 8-bit multiplexed address/data bus. Signal Name: A0 to A5, A7 Signal Description: Address Bus Signal Type: Input In nonmultiplexed bus operation (MUX = 0), serves as the address bus. In multiplexed bus operation (MUX = 1), these pins are not used and should be connected low. Signal Name: ALE (AS) / A6 Signal Description: Address Latch Enable (Address Strobe) or A6 Signal Type: Input In nonmultiplexed bus operation (MUX = 0), serves as address bit 6. In multiplexed bus operation (MUX = 1), serves to demultiplex the bus on a positive-going edge. Signal Name: BTS Signal Description: Bus Type Select Signal Type: Input Strap high to select Motorola bus timing; strap low to select Intel bus timing. This pin controls the function of the RD*(DS*), ALE(AS), and WR*(R/W*) pins. If BTS = 1, then these pins assume the function listed in parenthesis (). 24 of 117 DS21FT44/DS21FF44 Signal Name: RD* (DS*) Signal Description: Read Input (Data Strobe) Signal Type: Input RD* and DS* are active-low signals. Note: DS is active high when MUX = 1. See bus timing diagrams in Section 23. Signal Name: FS0 and FS1 Signal Description: Framer Selects Signal Type: Input Selects which of the four framers to be accessed. Signal Name: CS* Signal Description: Chip Select Signal Type: Input Must be low to read or write to the device. CS* is an active low signal. Signal Name: WR* (R/W*) Signal Description: Write Input (Read/Write) Signal Type: Input WR* is an active-low signal. TEST ACCESS PORT PINS Signal Name: Test Signal Description: 3–State Control Signal Type: Input Set high to tri-state all output and I/O pins (including the parallel control port). Set low for normal operation. Useful in board level testing. Signal Name: JTRST* Signal Description: IEEE 1149.1 Test Reset Signal Type: Input This signal is used to asynchronously reset the test access port controller. At power-up, JTRST* must be set low and then high. This action sets the device into the boundary scan bypass mode allowing normal device operation. If boundary scan is not used, this pin should be held low. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: JTMS Signal Description: IEEE 1149.1 Test Mode Select Signal Type: Input This pin is sampled on the rising edge of JTCLK and is used to place the test port into the various defined IEEE 1149.1 states. If not used, this pin should be pulled high. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: JTCLK Signal Description: IEEE 1149.1 Test Clock Signal Signal Type: Input This signal is used to shift data into JTDI on the rising edge and out of JTDO on the falling edge. If not used, this pin should be connected to VSS. This function is available when FMS = 0. 25 of 117 DS21FT44/DS21FF44 Signal Name: JTDI Signal Description: IEEE 1149.1 Test Data Input Signal Type: Input Test instructions and data are clocked into this pin on the rising edge of JTCLK. If not used, this pin should be pulled high. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. Signal Name: JTDO Signal Description: IEEE 1149.1 Test Data Output Signal Type: Output Test instructions and data are clocked out of this pin on the falling edge of JTCLK. If not used, this pin should be left unconnected. This function is available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44. SUPPLY PINS Signal Name: Signal Description: Signal Type: 2.97V to 3.63V VDD Positive Supply Supply Signal Name: Signal Description: Signal Type: 0.0V VSS Signal Ground Supply 26 of 117 DS21FT44/DS21FF44 8. DS21Q44 REGISTER MAP Table 8-1. REGISTER MAP SORTED BY ADDRESS ADDRESS 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 R/W R R R R R R R/W R/W R/W R/W — — — — — R R/W R/W R/W R/W R/W R/W R/W R/W — — R/W R/W R/W R/W R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W REGISTER NAME BPV or Code Violation Count 1 BPV or Code Violation Count 2 CRC4 Error Count 1 / FAS Error Count 1 CRC4 Error Count 2 E-Bit Count 1 / FAS Error Count 2 E-Bit Count 2 Status 1 Status 2 Receive Information Test 2 Not used Not used Not used Not used Not used Device ID Receive Control 1 Receive Control 2 Transmit Control 1 Transmit Control 2 Common Control 1 Test 1 Interrupt Mask 1 Interrupt Mask 2 Not Used Not Used Common Control 2 Common Control 3 Transmit Sa Bit Control Common Control 6 Synchronizer Status Receive Non-Align Frame Transmit Align Frame Transmit Non-Align Frame Transmit Channel Blocking 1 Transmit Channel Blocking 2 Transmit Channel Blocking 3 Transmit Channel Blocking 4 Transmit Idle 1 Transmit Idle 2 Transmit Idle 3 Transmit Idle 4 27 of 117 SYMBOL VCR1 VCR2 CRCCR1 CRCCR2 EBCR1 EBCR2 SR1 SR2 RIR TEST2 (set to 00h) (set to 00H) (set to 00H) (set to 00H) (set to 00H) (set to 00H) IDR RCR1 RCR2 TCR1 TCR2 CCR1 TEST1 (set to 00h) IMR1 IMR2 (set to 00H) (set to 00H) CCR2 CCR3 TSaCR CCR6 SSR RNAF TAF TNAF TCBR1 TCBR2 TCBR3 TCBR4 TIR1 TIR2 TIR3 TIR4 DS21FT44/DS21FF44 ADDRESS 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 R/W R/W R/W R/W R/W R/W R R R R R R R R R R R R R R R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W REGISTER NAME Transmit Idle Definition Receive Channel Blocking 1 Receive Channel Blocking 2 Receive Channel Blocking 3 Receive Channel Blocking 4 Receive Align Frame Receive Signaling 1 Receive Signaling 2 Receive Signaling 3 Receive Signaling 4 Receive Signaling 5 Receive Signaling 6 Receive Signaling 7 Receive Signaling 8 Receive Signaling 9 Receive Signaling 10 Receive Signaling 11 Receive Signaling 12 Receive Signaling 13 Receive Signaling 14 Receive Signaling 15 Receive Signaling 16 Transmit Signaling 1 Transmit Signaling 2 Transmit Signaling 3 Transmit Signaling 4 Transmit Signaling 5 Transmit Signaling 6 Transmit Signaling 7 Transmit Signaling 8 Transmit Signaling 9 Transmit Signaling 10 Transmit Signaling 11 Transmit Signaling 12 Transmit Signaling 13 Transmit Signaling 14 Transmit Signaling 15 Transmit Signaling 16 Transmit Si Bits Align Frame Transmit Si Bits Non-Align Frame Transmit Remote Alarm Bits Transmit Sa4 Bits Transmit Sa5 Bits Transmit Sa6 Bits Transmit Sa7 Bits Transmit Sa8 Bits 28 of 117 SYMBOL TIDR RCBR1 RCBR2 RCBR3 RCBR4 RAF RS1 RS2 RS3 RS4 RS5 RS6 RS7 RS8 RS9 RS10 RS11 RS12 RS13 RS14 RS15 RS16 TS1 TS2 TS3 TS4 TS5 TS6 TS7 TS8 TS9 TS10 TS11 TS12 TS13 TS14 TS15 TS16 TSiAF TSiNAF TRA TSa4 TSa5 TSa6 TSa7 TSa8 DS21FT44/DS21FF44 ADDRESS 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 R/W R R R R R R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W REGISTER NAME Receive Si Bits Align Frame Receive Si Bits Non-Align Frame Receive Remote Alarm Bits Receive Sa4 Bits Receive Sa5 Bits Receive Sa6 Bits Receive Sa7 Bits Receive Sa8 Bits Transmit Channel 1 Transmit Channel 2 Transmit Channel 3 Transmit Channel 4 Transmit Channel 5 Transmit Channel 6 Transmit Channel 7 Transmit Channel 8 Transmit Channel 9 Transmit Channel 10 Transmit Channel 11 Transmit Channel 12 Transmit Channel 13 Transmit Channel 14 Transmit Channel 15 Transmit Channel 16 Transmit Channel 17 Transmit Channel 18 Transmit Channel 19 Transmit Channel 20 Transmit Channel 21 Transmit Channel 22 Transmit Channel 23 Transmit Channel 24 Transmit Channel 25 Transmit Channel 26 Transmit Channel 27 Transmit Channel 28 Transmit Channel 29 Transmit Channel 30 Transmit Channel 31 Transmit Channel 32 Receive Channel 1 Receive Channel 2 Receive Channel 3 Receive Channel 4 Receive Channel 5 Receive Channel 6 29 of 117 SYMBOL RSiAF RSiNAF RRA RSa4 RSa5 RSa6 RSa7 RSa8 TC1 TC2 TC3 TC4 TC5 TC6 TC7 TC8 TC9 TC10 TC11 TC12 TC13 TC14 TC15 TC16 TC17 TC18 TC19 TC20 TC21 TC22 TC23 TC24 TC25 TC26 TC27 TC28 TC29 TC30 TC31 TC32 RC1 RC2 RC3 RC4 RC5 RC6 DS21FT44/DS21FF44 ADDRESS 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R R/W R R/W — — — R/W R/W R/W R/W REGISTER NAME Receive Channel 7 Receive Channel 8 Receive Channel 9 Receive Channel 10 Receive Channel 11 Receive Channel 12 Receive Channel 13 Receive Channel 14 Receive Channel 15 Receive Channel 16 Receive Channel 17 Receive Channel 18 Receive Channel 19 Receive Channel 20 Receive Channel 21 Receive Channel 22 Receive Channel 23 Receive Channel 24 Receive Channel 25 Receive Channel 26 Receive Channel 27 Receive Channel 28 Receive Channel 29 Receive Channel 30 Receive Channel 31 Receive Channel 32 Transmit Channel Control 1 Transmit Channel Control 2 Transmit Channel Control 3 Transmit Channel Control 4 Receive Channel Control 1 Receive Channel Control 2 Receive Channel Control 3 Receive Channel Control 4 Common Control 4 Transmit DS0 Monitor Common Control 5 Receive DS0 Monitor Test 3 Not Used Not Used Not Used HDLC Control Register HDLC Status Register HDLC Interrupt Mask Register Receive HDLC Information Register 30 of 117 SYMBOL RC7 RC8 RC9 RC10 RC11 RC12 RC13 RC14 RC15 RC16 RC17 RC18 RC19 RC20 RC21 RC22 RC23 RC24 RC25 RC26 RC27 RC28 RC29 RC30 RC31 RC32 TCC1 TCC2 TCC3 TCC4 RCC1 RCC2 RCC3 RCC4 CCR4 TDS0M CCR5 RDS0M TEST3 (set to 00H) (set to 00H) (set to 00H) (set to 00H) HCR HSR HIMR RHIR DS21FT44/DS21FF44 ADDRESS B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF R/W R/W R/W R/W R/W R/W R/W R/W R/W — — — — REGISTER NAME Receive HDLC FIFO Register Interleave Bus Operation Register Transmit HDLC Information Register Transmit HDLC FIFO Register Receive HDLC DS0 Control Register 1 Receive HDLC DS0 Control Register 2 Transmit HDLC DS0 Control Register 1 Transmit HDLC DS0 Control Register 2 Not Used Not Used Not Used Not Used SYMBOL RHFR IBO THIR THFR RDC1 RDC2 TDC1 TDC2 (set to 00H) (set to 00H) (set to 00H) (set to 00H) NOTES: 1) Test Registers 1, 2, and 3 are used only by the factory; these registers must be cleared (set to all 0’s) on power-up initialization to ensure proper operation. 2) Register banks CxH, DxH, ExH, and FxH are not accessible. 31 of 117 DS21FT44/DS21FF44 9. PARALLEL PORT The DS21Q44 is controlled by either a nonmultiplexed (MUX = 0) or a multiplexed (MUX = 1) bus by an external microcontroller or microprocessor. The DS21Q44 can operate with either Intel or Motorola bus timing configurations. If the BTS pin is connected low, Intel timing will be selected; if connected high, Motorola timing will be selected. All Motorola bus signals are listed in parenthesis (). See the timing diagrams in the A.C. Electrical Characteristics in Section 23 for more details. 10. CONTROL, ID, AND TEST REGISTERS The operation of each framer within the DS21Q44 is configured by a set of 10 control registers. Typically, the control registers are only accessed when the system is first powered up. Once a channel in the DS21Q44 has been initialized, the control registers will only need to be accessed when there is a change in the system configuration. There are two Receive Control Register (RCR1 and RCR2), two Transmit Control Registers (TCR1 and TCR2), and six Common Control Registers (CCR1 to CCR6). Each of the ten registers are described in this section. There is a device Identification Register (IDR) at address 0Fh. The MSB of this read-only register is fixed to a one indicating that the DS21Q44 is present. The T1 pin-for-pin compatible version of the DS21Q44 is the DS21Q42 and it also has an ID register at address 0Fh and the user can read the MSB to determine which chip is present since in the DS21Q42 the MSB will be set to a 0 and in the DS21Q44 it will be set to a one. The lower 4 bits of the IDR are used to display the die revision of the chip. Power-Up Sequence The DS21Q44 does not automatically clear its register space on power-up. After the supplies are stable, each of the four framer’s register space should be configured for operation by writing to all of the internal registers. This includes setting the Test and all unused registers to 00Hex. This can be accomplished using a two-pass approach on each framer within the DS21Q44. 1) Clear framer’s register space by writing 00H to the addresses 00H through 0BFH. 2) Program required registers to achieve desired operating mode. NOTE: When emulating the DS21Q43 feature set (FMS = 1), the full address space (00H through 0BFH) must be initialized. DS21Q43 emulation require address pin A7 to be used. FMS is connected to ground for the DS21FF44/DS21FT44. Finally, after the TSYSCLK and RSYSCLK inputs are stable, the ESR bit should be toggled from a zero to a one (this step can be skipped if the elastic stores are disabled). 32 of 117 DS21FT44/DS21FF44 IDR: DEVICE IDENTIFICATION REGISTER (Address = 0F Hex) (MSB) T1E1 0 0 SYMBOL POSITION T1E1 IDR.7 ID3 IDR.3 ID2 ID1 IDR.1 IDR.2 ID0 IDR.0 0 ID3 ID2 ID1 (LSB) ID0 NAME AND DESCRIPTION T1 or E1 Chip Determination Bit 0 = T1 chip 1 = E1 chip Chip Revision Bit 3. MSB of a decimal code that represents the chip revision. Chip Revision Bit 2 Chip Revision Bit 1 Chip Revision Bit 0. LSB of a decimal code that represents the chip revision. RCR1: RECEIVE CONTROL REGISTER 1 (Address = 10 Hex) (MSB) RSMF SYMBOL RSM RSIO POSITION RSMF RCR1.7 RSM RCR1.6 RSIO RCR1.5 — — RCR1.4 RCR1.3 FRC RCR1.2 SYNCE RCR1.1 RESYNC RCR1.0 — — FRC SYNCE (LSB) RESYNC NAME AND DESCRIPTION RSYNC Multiframe Function. Only used if the RSYNC pin is programmed in the multiframe mode (RCR1.6 = 1). 0 = RSYNC outputs CAS multiframe boundaries 1 = RSYNC outputs CRC4 multiframe boundaries RSYNC Mode Select 0 = frame mode (See timing diagrams in Section 22.) 1 = multiframe mode (See timing diagrams in Section 22.) RSYNC I/O Select. (Note: this bit must be set to zero when RCR2.1 = 0). 0 = RSYNC is an output (depends on RCR1.6) 1 = RSYNC is an input (only valid if elastic store enabled) Not Assigned. Should be set to zero when written. Not Assigned. Should be set to zero when written. Frame Resync Criteria 0 = resync if FAS received in error three consecutive times 1 = resync if FAS or bit 2 of non-FAS is received in error three consecutive times Sync Enable 0 = auto resync enabled 1 = auto resync disabled Resync. When toggled from low to high, a resync is initiated. Must be cleared and set again for a subsequent resync. 33 of 117 DS21FT44/DS21FF44 Table 10–1. SYNC/RESYNC CRITERIA FRAME OR MULTIFRAME LEVEL SYNC CRITERIA RESYNC CRITERIA ITU SPEC. Three consecutive incorrect FAS received FAS CRC4 CAS FAS present in frame N and N + 2, and FAS not present in frame N + 1 Two valid MF alignment words found within 8 ms Valid MF alignment word found and previous timeslot 16 contains code other than all zeros Alternate (RCR1.2 = 1) the above criteria is met or three consecutive incorrect bit 2 of non-FAS received 915 or more CRC4 code words out of 1000 received in error Two consecutive MF alignment words received in error G.706 4.1.1 4.1.2 G.706 4.2 and 4.3.2 G.732 5.2 RCR2: RECEIVE CONTROL REGISTER 2 (Address = 11 Hex) (MSB) Sa8S Sa7S Sa6S SYMBOL POSITION Sa8S RCR2.7 Sa7S RCR2.6 Sa6S RCR2.5 Sa5S RCR2.4 Sa4S RCR2.3 RBCS RCR2.2 RESE RCR2.1 — RCR2.0 Sa5S Sa4S RBCS RESE (LSB) — NAME AND DESCRIPTION Sa8 Bit Select. Set to one to have RLCLK pulse at the Sa8 bit position; set to zero to force RLCLK low during Sa8 bit position. See Section 22 for timing details. Sa7 Bit Select. Set to one to have RLCLK pulse at the Sa7 bit position; set to zero to force RLCLK low during Sa7 bit position. See Section 22 for timing details. Sa6 Bit Select. Set to one to have RLCLK pulse at the Sa6 bit position; set to zero to force RLCLK low during Sa6 bit position. See Section 22 for timing details. Sa5 Bit Select. Set to one to have RLCLK pulse at the Sa5 bit position; set to zero to force RLCLK low during Sa5 bit position. See Section 22 for timing details. Sa4 Bit Select. Set to one to have RLCLK pulse at the Sa4 bit position; set to zero to force RLCLK low during Sa4 bit position. See Section 22 for timing details. Receive Side Backplane Clock Select 0 = if RSYSCLK is 1.544MHz 1 = if RSYSCLK is 2.048MHz Receive Side Elastic Store Enable 0 = elastic store is bypassed 1 = elastic store is enabled Not Assigned. Should be set to zero when written. 34 of 117 DS21FT44/DS21FF44 TCR1: TRANSMIT CONTROL REGISTER 1 (Address = 12 Hex) (MSB) ODF TFPT T16S SYMBOL POSITION ODF TCR1.7 TFPT TCR1.6 T16S TCR1.5 TUA1 TCR1.4 TSiS TCR1.3 TSA1 TCR1.2 TSM CR1.1 TSIO TCR1.0 TUA1 TSiS TSA1 TSM (LSB) TSIO NAME AND DESCRIPTION Output Data Format 0 = bipolar data at TPOS and TNEG 1 = NRZ data at TPOS; TNEG = 0 Transmit Timeslot 0 Pass Through 0 = FAS bits/Sa bits/Remote Alarm sourced internally from the TAF and TNAF registers 1 = FAS bits/Sa bits/Remote Alarm sourced from TSER Transmit Timeslot 16 Data Select 0 = sample timeslot 16 at TSER pin 1 = source timeslot 16 from TS0 to TS15 registers Transmit Unframed All Ones 0 = transmit data normally 1 = transmit an unframed all one’s code at TPOS and TNEG Transmit International Bit Select 0 = sample Si bits at TSER pin 1 = source Si bits from TAF and TNAF registers (in this mode, TCR1.6 must be set to 0) Transmit Signaling All Ones 0 = normal operation 1 = force timeslot 16 in every frame to all ones TSYNC Mode Select 0 = frame mode (see the timing in Section 22) 1 = CAS and CRC4 multiframe mode (see the timing in Section 22) TSYNC I/O Select 0 = TSYNC is an input 1 = TSYNC is an output Note: See Figure 22–15 for more details about how the Transmit Control Registers affect the operation of the DS21Q44. 35 of 117 DS21FT44/DS21FF44 TCR2: TRANSMIT CONTROL REGISTER 2 (Address = 13 Hex) (MSB) Sa8S Sa7S Sa6S SYMBOL POSITION Sa8S TCR2.7 Sa7S TCR2.6 Sa6S TCR2.5 Sa5S TCR2.4 Sa4S TCR2.3 ODM TCR2.2 AEBE TCR2.1 PF TCR2.0 Sa5S Sa4S ODM AEBE (LSB) PF NAME AND DESCRIPTION Sa8 Bit Select. Set to one to source the Sa8 bit from the TLINK pin; set to zero to not source the Sa8 bit. See Section 22 for timing details. Sa7 Bit Select. Set to one to source the Sa7 bit from the TLINK pin; set to zero to not source the Sa7 bit. See Section 22 for timing details. Sa6 Bit Select. Set to one to source the Sa6 bit from the TLINK pin; set to zero to not source the Sa6 bit. See Section 22 for timing details. Sa5 Bit Select. Set to one to source the Sa5 bit from the TLINK pin; set to zero to not source the Sa5 bit. See Section 22 for timing details. Sa4 Bit Select. Set to one to source the Sa4 bit from the TLINK pin; set to zero to not source the Sa4 bit. See Section 22 for timing details. Output Data Mode 0 = pulses at TPOSO and TNEGO are one full TCLKO period wide 1 = pulses at TPOSO and TNEGO are 1/2 TCLKO period wide Automatic E-Bit Enable 0 = E–bits not automatically set in the transmit direction 1 = E–bits automatically set in the transmit direction Function of RLOS/LOTC Pin 0 = Receive Loss of Sync (RLOS) 1 = Loss of Transmit Clock (LOTC) 36 of 117 DS21FT44/DS21FF44 CCR1: COMMON CONTROL REGISTER 1 (Address = 14 Hex) (MSB) FLB THDB3 TG802 SYMBOL POSITION FLB CCR1.7 THDB3 CCR1.6 TG802 CCR1.5 TCRC4 CCR1.4 RSM CCR1.3 RHDB3 CCR1.2 RG802 CCR1.1 RCRC4 CCR1.0 TCRC4 RSM RHDB3 RG802 (LSB) RCRC4 NAME AND DESCRIPTION Framer Loopback 0 = loopback disabled 1 = loopback enabled Transmit HDB3 Enable 0 = HDB3 disabled 1 = HDB3 enabled Transmit G.802 Enable. See Section 22 for details. 0 = do not force TCHBLK high during bit 1 of timeslot 26 1 = force TCHBLK high during bit 1 of timeslot 26 Transmit CRC4 Enable 0 = CRC4 disabled 1 = CRC4 enabled Receive Signaling Mode Select 0 = CAS signaling mode 1 = CCS signaling mode Receive HDB3 Enable 0 = HDB3 disabled 1 = HDB3 enabled Receive G.802 Enable. See Section 22 for details. 0 = do not force RCHBLK high during bit 1 of timeslot 26 1 = force RCHBLK high during bit 1 of timeslot 26 Receive CRC4 Enable 0 = CRC4 disabled 1 = CRC4 enabled FRAMER LOOPBACK When CCR1.7 is set to a one, the framer will enter a Framer LoopBack (FLB) mode. See Figure 6–1 for more details. This loopback is useful in testing and debugging applications. In FLB, the framer will loop data from the transmit side back to the receive side. When FLB is enabled, the following will occur: 1) Data will be transmitted as normal at TPOS and TNEG. 2) Data input by RPOS and RNEG will be ignored. 3) The RCLK output will be replaced with the TCLK input. 37 of 117 DS21FT44/DS21FF44 CCR2: COMMON CONTROL REGISTER 2 (Address = 1A Hex) (MSB) ECUS SYMBOL VCRFS AAIS ARA POSITION ECUS CCR2.7 VCRFS CCR2.6 AAIS CCR2.5 ARA CCR2.4 RSERC CCR2.3 LOTCMC CCR2.2 RFF CCR2.1 RFE CCR2.0 RSERC LOTCMC RFF (LSB) RFE NAME AND DESCRIPTION Error Counter Update Select. See Section 12 for details. 0 = update error counters once a second 1 = update error counters every 62.5ms (500 frames) VCR Function Select. See Section 12 for details. 0 = count BiPolar Violations (BPVs) 1 = count Code Violations (CVs) Automatic AIS Generation 0 = disabled 1 = enabled Automatic Remote Alarm Generation 0 = disabled 1 = enabled RSER Control 0 = allow RSER to output data as received under all conditions 1 = force RSER to one under loss of frame alignment conditions Loss of Transmit Clock Mux Control. Determines whether the transmit side formatter should switch to the ever present RCLK if the TCLK should fail to transition (Figure 6–1). 0 = do not switch to RCLK if TCLK stops 1 = switch to RCLK if TCLK stops Receive Force Freeze. Freezes receive side signaling at RSIG (and RSER if CCR3.3 = 1); will override Receive Freeze Enable (RFE). See Section 14 or details. 0 = do not force a freeze event 1 = force a freeze event Receive Freeze Enable. See Section 14 for details. 0 = no freezing of receive signaling data will occur 1 = allow freezing of receive signaling data at RSIG (and RSER if CCR3.3 = 1) AUTOMATIC ALARM GENERATION The DS21Q44 can be programmed to automatically transmit AIS or Remote Alarm. When automatic AIS generation is enabled (CCR2.5 = 1), the framer monitors the receive side to determine if any of the following conditions are present: loss of receive frame synchronization, AIS alarm (all one’s) reception, or loss of receive carrier (or signal). If any one (or more) of the above conditions is present, then the framer will transmit an AIS alarm. When automatic RAI generation is enabled (CCR2.4 = 1), the framer monitors the receive side to determine if any of the following conditions are present: loss of receive frame synchronization, AIS alarm (all one’s) reception, loss of receive carrier or if CRC4 multiframe synchronization (if enabled) cannot be found within 128ms of FAS synchronization. If any one (or more) of the above conditions is present, then the framer will transmit a RAI alarm. RAI generation conforms to ETS 300 011 specifications and a 38 of 117 DS21FT44/DS21FF44 constant Remote Alarm will be transmitted if the framer cannot find CRC4 multiframe synchronization within 400ms as per G.706. It is an illegal state to have both CCR2.4 and CCR2.5 set to one at the same time. CCR3: COMMON CONTROL REGISTER 3 (Address = 1B Hex) (MSB) TESE TCBFS TIRFS SYMBOL POSITION TESE CCR3.7 TCBFS CCR3.6 TIRFS CCR3.5 – CCR3.4 RSRE CCR3.3 THSE CCR3.2 TBCS CCR3.1 RCLA CCR3.0 — RSRE THSE TBCS (LSB) RCLA NAME AND DESCRIPTION Transmit Side Elastic Store Enable 0 = elastic store is bypassed 1 = elastic store is enabled Transmit Channel Blocking Registers (TCBR) Function Select 0 = TCBRs define the operation of the TCHBLK output pin 1 = TCBRs define which signaling bits are to be inserted Transmit Idle Registers (TIR) Function Select. See Section 15 for details. 0 = TIRs define in which channels to insert idle code 1 = TIRs define in which channels to insert data from RSER (i.e., Per Channel Loopback function) Not Assigned. Should be set to zero when written. Receive Side Signaling Reinsertion Enable. See Section 14 for details. 0 = do not reinsert signaling bits into the data stream presented at the RSER pin 1 = reinsert the signaling bits into data stream presented at the RSER pin Transmit Side Hardware Signaling Insertion Enable. See Section 14 for details. 0 = do not insert signaling from the TSIG pin into the data stream presented at the TSER pin 1 = insert signaling from the TSIG pin into the data stream presented at the TSER pin Transmit Side Backplane Clock Select 0 = if TSYSCLK is 1.544MHz 1 = if TSYSCLK is 2.048MHz Receive Carrier Loss (RCL) Alternate Criteria 0 = RCL declared upon 255 consecutive zeros (125µs) 1 = RCL declared upon 2048 consecutive zeros (1ms) 39 of 117 DS21FT44/DS21FF44 CCR4: COMMON CONTROL REGISTER 4 (Address = A8 Hex) (MSB) RLB — — TCM4 TCM3 TCM2 TCM1 (LSB) TCM0 SYMBOL POSITION NAME AND DESCRIPTION RLB CCR4.7 — — CCR4.6 CCR4.5 TCM4 CCR4.4 TCM3 CCR4.3 Remote Loopback 0 = loopback disabled 1 = loopback enabled Not Assigned. Should be set to zero when written. Not Assigned. Should be set to zero when written. Transmit Channel Monitor Bit 4. MSB of a channel decode that determines which transmit channel data appears in the TDS0M register (Section 13). Transmit Channel Monitor Bit 3 TCM2 CCR4.2 Transmit Channel Monitor Bit 2 TCM1 CCR4.1 TCM0 CCR4.0 Transmit Channel Monitor Bit 1 Transmit Channel Monitor Bit 0. LSB of the channel decode. 40 of 117 DS21FT44/DS21FF44 CCR5: COMMON CONTROL REGISTER 5 (Address = AA Hex) (MSB) — RESALGN TESALGN RCM4 RCM3 RCM2 RCM1 (LSB) RCM0 SYMBOL POSITION NAME AND DESCRIPTION — CCR5.7 RESALGN CCR5.6 TESALGN CCR5.5 RCM4 CCR5.4 RCM3 CCR5.3 Not Assigned. Should be set to zero when written Receive Elastic Store Align. Setting this bit from a zero to a one may force the receive elastic store’s write/read pointers to a minimum separation of half a frame. No action will be taken if the pointer separation is already greater or equal to half a frame. If pointer separation is less then half a frame, the command will be executed and data will be disrupted. Should be toggled after RSYSCLK has been applied and is stable. Must be cleared and set again for a subsequent align (Section 17). Transmit Elastic Store Align. Setting this bit from a zero to a one may force the transmit elastic store’s write/read pointers to a minimum separation of half a frame. No action is taken if the pointer separation is already greater or equal to half a frame. If pointer separation is less than half a frame, the command will be executed and data will be disrupted. Should be toggled after TSYSCLK has been applied and is stable. Must be cleared and set again for a subsequent align (Section 17). Receive Channel Monitor Bit 4. MSB of a channel decode that determines which receive channel data appears in the RDS0M register (Section 13). Receive Channel Monitor Bit 3 RCM2 RCM1 CCR5.2 CCR5.1 Receive Channel Monitor Bit 2 Receive Channel Monitor Bit 1 RCM0 CCR5.0 Receive Channel Monitor Bit 0. LSB of the channel decode. 41 of 117 DS21FT44/DS21FF44 CCR6: COMMON CONTROL REGISTER 6 (Address = 1D Hex) (MSB) — — — SYMBOL — — — — — POSITION CCR6.7 CCR6.6 CCR6.5 CCR6.4 CCR6.3 TCLKSRC CCR6.2 RESR CCR6.1 TESR CCR6.0 11. — — TCLKSRC RESR (LSB) TESR NAME AND DESCRIPTION Not Assigned. Should be set to zero when written Not Assigned. Should be set to zero when written Not Assigned. Should be set to zero when written Not Assigned. Should be set to zero when written Not Assigned. Should be set to zero when written Transmit Clock Source Select. This function allows the user to internally select RCLK as the clock source for the transmit side formatter. 0 = transmit side formatter clocked with signal applied at TCLK pin. LOTC Mux function is operational (TCR1.7) 1 = transmit side formatter clocked with RCLK. Receive Elastic Store Reset. Setting this bit from a zero to a one will force the receive elastic store to a depth of one frame. Receive data is lost during the reset. Should be toggled after RSYSCLK has been applied and is stable. Do not leave this bit set high. Transmit Elastic Store Reset. Setting this bit from a zero to a one will force the transmit elastic store to a depth of one frame. Transmit data is lost during the reset. Should be toggled after TSYSCLK has been applied and is stable. Do not leave this bit set high. STATUS AND INFORMATION REGISTERS There is a set of seven registers per framer that contain information on the current real time status of a framer in the DS21Q44, Status Register 1 (SR1), Status Register 2 (SR2), Receive Information Register (RIR), Synchronizer status Register (SSR) and a set of three registers for the onboard HDLC controller. The specific details on the four registers pertaining to the HDLC controller are covered in Section 19 but they operate the same as the other status registers in the DS21Q44 and this operation is described below. When a particular event has occurred (or is occurring), the appropriate bit in one of these four registers will be set to a one. All of the bits in SR1, SR2, and RIR1 registers operate in a latched fashion. The Synchronizer status Register contents are not latched. This means that if an event or an alarm occurs and a bit is set to a one in any of the registers, it will remain set until the user reads that bit. The bit will be cleared when it is read and it will not be set again until the event has occurred again (or in the case of the RSA1, RSA0, RDMA, RUA1, RRA, RCL, and RLOS alarms, the bit will remain set if the alarm is still present). The user will always precede a read of any of the SR1, SR2 and RIR registers with a write. The byte written to the register will inform the framer which bits the user wishes to read and have cleared. The user will write a byte to one of these registers, with a one in the bit positions he or she wishes to read and a zero in the bit positions he or she does not wish to obtain the latest information on. When a one is written to a bit location, the read register will be updated with the latest information. When a zero is written to a bit position, the read register will not be updated and the previous value will be held. A write 42 of 117 DS21FT44/DS21FF44 to the status and information registers will be immediately followed by a read of the same register. The read result should be logically AND’ed with the mask byte that was just written and this value should be written back into the same register to insure that bit does indeed clear. This second write step is necessary because the alarms and events in the status registers occur asynchronously in respect to their access by the parallel port. This write-read-write scheme allows an external microcontroller or microprocessor to individually poll certain bits without disturbing the other bits in the register. This operation is key in controlling the DS21Q44 with higher–order software languages. The SSR register operates differently than the other three. It is a read only register and it reports the status of the synchronizer in real time. This register is not latched and it is not necessary to precede a read of this register with a write. The SR1, SR2, and HSR registers have the unique ability to initiate a hardware interrupt by the INT* output pin. Each of the alarms and events in the SR1, SR2, and HSR can be either masked or unmasked from the interrupt pin by the Interrupt Mask Register 1 (IMR1), Interrupt Mask Register 2 (IMR2), and HDLC Interrupt Mask Register (HIMR) respectively. The HIMR register is covered in Section 19. The interrupts caused by four of the alarms in SR1 (namely RUA1, RRA, RCL, and RLOS) act differently than the interrupts caused by other alarms and events in SR1 and SR2 (namely RSA1, RDMA, RSA0, RSLIP, RMF, RAF, TMF, SEC, TAF, LOTC, RCMF, and TSLIP). These four alarm interrupts will force the INT* pin low whenever the alarm changes state (i.e., the alarm goes active or inactive according to the set/clear criteria in Table 11-1). The INT* pin will be allowed to return high (if no other interrupts are present) when the user reads the alarm bit that caused the interrupt to occur. If the alarm is still present, the register bit will remain set. The event caused interrupts will force the INT* pin low when the event occurs. The INT* pin will be allowed to return high (if no other interrupts are present) when the user reads the event bit that caused the interrupt to occur. 43 of 117 DS21FT44/DS21FF44 ISR: INTERRUPT STATUS REGISTER (Any address from 0C0 Hex to 0FF Hex) (MSB) F3HDLC F3SR F2HDLC SYMBOL POSITION F3HDLC ISR.7 F3SR ISR.6 F2HDLC ISR.5 F2SR ISR.4 F1HDLC ISR.3 F1SR ISR.2 F0HDLC ISR.1 F0SR ISR.0 F2SR F1HDLC F1SR F0HDLC NAME AND DESCRIPTION Framer 3 HDLC Controller Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 3 SR1 or SR2 Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 2 HDLC Controller Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 2 SR1 or SR2 Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 1 HDLC Controller Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 1 SR1 or SR2 Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 0 HDLC Controller Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending Framer 0 SR1 or SR2 Interrupt Request 0 = No interrupt request pending 1 = Interrupt request pending 44 of 117 (LSB) F0SR DS21FT44/DS21FF44 RIR: RECEIVE INFORMATION REGISTER (Address = 08 Hex) (MSB) TESF TESE LORC SYMBOL POSITION TESF RIR.7 TESE RIR.6 LORC RIR.5 RESF RIR.4 RESE RIR.3 CRCRC RIR.2 FASRC RIR.1 CASRC RIR.0 RESF RESE CRCRC FASRC (LSB) CASRC NAME AND DESCRIPTION Transmit Side Elastic Store Full. Set when the transmit side elastic store buffer fills and a frame is deleted. Transmit Side Elastic Store Empty. Set when the transmit side elastic store buffer empties and a frame is repeated. Loss of Receive Clock. Set when the RCLK pin has not transitioned for at least 2ms (3ms ± 1ms). Receive Side Elastic Store Full. Set when the receive side elastic store buffer fills and a frame is deleted. Receive Side Elastic Store Empty. Set when the receive side elastic store buffer empties and a frame is repeated. CRC Resync Criteria Met. Set when 915/1000 code words are received in error. FAS Resync Criteria Met. Set when three consecutive FAS words are received in error. CAS Resync Criteria Met. Set when two consecutive CAS MF alignment words are received in error. SSR: SYNCHRONIZER STATUS REGISTER (Address = 1E Hex) (MSB) CSC5 CSC4 CSC3 CSC2 CSC0 FASSA CASSA (LSB) CRC4SA SYMBOL POSITION NAME AND DESCRIPTION CSC5 CSC4 CSC3 CSC2 SSR.7 SSR.6 SSR.5 SSR.4 CSC0 SSR.3 FASSA SSR.2 CASSA SSR.1 CRC4SA SSR.0 CRC4 Sync Counter Bit 5. MSB of the 6-bit counter. CRC4 Sync Counter Bit 4 CRC4 Sync Counter Bit 3 CRC4 Sync Counter Bit 2 CRC4 Sync Counter Bit 0. LSB of the 6-bit counter. The next to LSB is not accessible. FAS Sync Active. Set while the synchronizer is searching for alignment at the FAS level. CAS MF Sync Active. Set while the synchronizer is searching for the CAS MF alignment word. CRC4 MF Sync Active. Set while the synchronizer is searching for the CRC4 MF alignment word. CRC4 SYNC COUNTER The CRC4 Sync Counter increments each time the 8ms CRC4 multiframe search times out. The counter is cleared when the framer has successfully obtained synchronization at the CRC4 level. The counter can also be cleared by disabling the CRC4 mode (CCR1.0=0). This counter is useful for determining the amount of time the framer has been searching for synchronization at the CRC4 level. ITU G.706 suggests 45 of 117 DS21FT44/DS21FF44 that if synchronization at the CRC4 level cannot be obtained within 400ms, then the search should be abandoned and proper action taken. The CRC4 Sync Counter rolls over. SR1: STATUS REGISTER 1 (Address = 06 Hex) (MSB) RSA1 SYMBOL RDMA RSA0 POSITION RSA1 SR1.7 RDMA SR1.6 RSA0 SR1.5 RSLIP SR1.4 RUA1 SR1.3 RRA SR1.2 RCL SR1.1 RLOS SR1.0 RSLIP RUA1 RRA RCL (LSB) RLOS NAME AND DESCRIPTION Receive Signaling All Ones/Signaling Change. Set when over a full MF, the content of timeslot 16 contains fewer than three zeros. This alarm is not disabled in the CCS signaling mode. A change in the contents of RS1 through RS16 from one multiframe to the next will cause RSA1 and RSA0 to be set. Receive Distant MF Alarm. Set when bit 6 of timeslot 16 in frame 0 has been set for two consecutive multiframes. This alarm is not disabled in the CCS signaling mode. Receive Signaling All Zeros/Signaling Change. Set when over a full MF, timeslot 16 contains all zeros. A change in the contents of RS1 through RS16 from one multiframe to the next will cause RSA1 and RSA0 to be set. Receive Side Elastic Store Slip. Set when the elastic store has either repeated or deleted a frame of data. Receive Unframed All Ones. Set when an unframed all ones code is received at RPOS and RNEG. Receive Remote Alarm. Set when a remote alarm is received at RPOS and RNEG. Receive Carrier Loss. Set when 255 (or 2048 if CCR3.0 = 1) consecutive zeros have been detected at RPOS and RNEG. Receive Loss of Sync. Set when the device is not synchronized to the receive E1 stream. 46 of 117 DS21FT44/DS21FF44 Table 11-1. ALARM CRITERIA ALARM SET CRITERIA Over 16 consecutive frames (one full MF) RSA1 (receive signaling all 1’s) timeslot 16 contains less than three 0’s Over 16 consecutive frames (one full MF) RSA0 (receive signaling all 0’s) timeslot 16 contains all 0’s Bit 6 in timeslot 16 of RDMA (receive distant frame 0 set to 1 for two multiframe alarm) consecutive MF Less than three 0’s in two RUA1 (receive unframed all 1’s) frames (512 bits) Bit 3 of nonalign frame RRA set to one for three (receive remote alarm) consecutive occasions 255 (or 2048) consecutive RCL (receive carrier loss) 0’s received CLEAR CRITERIA ITU SPEC. Over 16 consecutive frames (one full MF) timeslot 16 contains three or more 0’s G.732 4.2 Over 16 consecutive frames (one full MF) timeslot 16 contains at least a single 1 G.732 5.2 Bit 6 in timeslot 16 of frame 0 set to 0 for two consecutive MF More than two 0’s in two frames (512 bits) O.162 1.6.1.2 Bit 3 of nonalign frame set to 0 for three consecutive occasions O.162 2.1.4 In 255 bit times, at least 32 1’s are received G.775/G.962 47 of 117 O.162 2.1.5 DS21FT44/DS21FF44 SR2: STATUS REGISTER 2 (Address = 07 Hex) (MSB) RMF RAF TMF SYMBOL POSITION RMF SR2.7 RAF SR2.6 TMF SR2.5 SEC SR2.4 TAF SR2.3 LOTC SR2.2 RCMF SR2.1 TSLIP SR2.0 SEC TAF LOTC RCMF (LSB) TSLIP NAME AND DESCRIPTION Receive CAS Multiframe. Set every 2ms (regardless if CAS signaling is enabled or not) on receive multiframe boundaries. Used to alert the host that signaling data is available. Receive Align Frame. Set every 250µs at the beginning of align frames. Used to alert the host that Si and Sa bits are available in the RAF and RNAF registers. Transmit Multiframe. Set every 2ms (regardless if CRC4 is enabled) on transmit multiframe boundaries. Used to alert the host that signaling data needs to be updated. One Second Timer. Set on increments of one second based on RCLK. If CCR2.7 = 1, then this bit will be set every 62.5ms instead of once a second. Transmit Align Frame. Set every 250µs at the beginning of align frames. Used to alert the host that the TAF and TNAF registers need to be updated. Loss of Transmit Clock. Set when the TCLK pin has not transitioned for one channel time (or 3.9µs). Will force the LOTC pin high if enabled by TCR2.0. Receive CRC4 Multiframe. Set on CRC4 multiframe boundaries; will continue to be set every 2ms on an arbitrary boundary if CRC4 is disabled. Transmit Elastic Store Slip. Set when the elastic store has either repeated or deleted a frame of data. 48 of 117 DS21FT44/DS21FF44 IMR1: INTERRUPT MASK REGISTER 1 (Address = 16 Hex) (MSB) RSA1 RDMA RSA0 SYMBOL POSITION RSA1 IMR1.7 RDMA IMR1.6 RSA0 IMR1.5 RSLIP IMR1.4 RUA1 IMR1.3 RRA IMR1.2 RCL IMR1.1 RLOS IMR1.0 RSLIP RUA1 RRA RCL NAME AND DESCRIPTION Receive Signaling All Ones/Signaling Change 0=interrupt masked 1=interrupt enabled Receive Distant MF Alarm 0=interrupt masked 1=interrupt enabled Receive Signaling All Zeros/Signaling Change 0=interrupt masked 1=interrupt enabled Receive Elastic Store Slip Occurrence 0=interrupt masked 1=interrupt enabled Receive Unframed All Ones 0=interrupt masked 1=interrupt enabled Receive Remote Alarm 0=interrupt masked 1=interrupt enabled Receive Carrier Loss 0=interrupt masked 1=interrupt enabled Receive Loss of Sync 0=interrupt masked 1=interrupt enabled 49 of 117 (LSB) RLOS DS21FT44/DS21FF44 IMR2: INTERRUPT MASK REGISTER 2 (Address = 17 Hex) (MSB) RMF RAF TMF SYMBOL POSITION RMF IMR2.7 RAF IMR2.6 TMF IMR2.5 SEC IMR2.4 TAF IMR2.3 LOTC IMR2.2 RCMF IMR2.1 TSLIP IMR2.0 12. SEC TAF LOTC RCMF (LSB) TSLIP NAME AND DESCRIPTION Receive CAS Multiframe 0 = interrupt masked 1 = interrupt enabled Receive Align Frame 0 = interrupt masked 1 = interrupt enabled Transmit Multiframe 0 = interrupt masked 1 = interrupt enabled One Second Timer 0 = interrupt masked 1 = interrupt enabled Transmit Align Frame 0 = interrupt masked 1 = interrupt enabled Loss Of Transmit Clock 0 = interrupt masked 1 = interrupt enabled Receive CRC4 Multiframe 0 = interrupt masked 1 = interrupt enabled Transmit Side Elastic Store Slip Occurrence 0 = interrupt masked 1 = interrupt enabled ERROR COUNT REGISTERS There are a set of four counters in each framer that record bipolar or code violations, errors in the CRC4 SMF code words, E bits as reported by the far end, and word errors in the FAS. Each of these four counters are automatically updated on either one second boundaries (CCR2.7=0) or every 62.5ms (CCR2.7=1) as determined by the timer in Status Register 2 (SR2.4). Hence, these registers contain performance data from either the previous second or the previous 62.5ms. The user can use the interrupt from the one-second timer to determine when to read these registers. The user has a full second (or 62.5 ms) to read the counters before the data is lost. All four counters will saturate at their respective maximum counts and they will not rollover. BPV or Code Violation Counter Violation Count Register 1 (VCR1) is the most significant word and VCR2 is the least significant word of a 16-bit counter that records either BiPolar Violations (BPVs) or Code Violations (CVs). If CCR2.6 = 0, then the VCR counts bipolar violations. Bipolar violations are defined as consecutive marks of the same polarity. In this mode, if the HDB3 mode is set for the receive side by CCR1.2, then HDB3 code words are not counted as BPVs. If CCR2.6 = 1, then the VCR counts code violations as defined in ITU O.161. Code violations are defined as consecutive bipolar violations of the same polarity. In most applications, the framer should be programmed to count BPVs when receiving AMI code and to count CVs when 50 of 117 DS21FT44/DS21FF44 receiving HDB3 code. This counter increments at all times and is not disabled by loss of sync conditions. The counter saturates at 65,535 and will not rollover. The bit error rate on a E1 line would have to be greater than 10** –2 before the VCR would saturate. VCR1: UPPER BIPOLAR VIOLATION COUNT REGISTER 1 (Address = 00 Hex) VCR2: LOWER BIPOLAR VIOLATION COUNT REGISTER 2 (Address = 01 Hex) (MSB) V15 V7 V14 V6 V13 V5 V12 V4 V11 V3 V10 V2 V9 V1 SYMBOL POSITION V15 VCR1.7 MSB of the 16-bit code violation count V0 VCR2.0 LSB of the 10-bit code violation count (LSB) V8 V0 VCR1 VCR2 NAME AND DESCRIPTION CRC4 Error Counter CRC4 Count Register 1 (CRCCR1) is the most significant word and CRCCR2 is the least significant word of a 10–bit counter that records word errors in the Cyclic Redundancy Check 4 (CRC4). Since the maximum CRC4 count in a one second period is 1000, this counter cannot saturate. The counter is disabled during loss of sync at either the FAS or CRC4 level; it will continue to count if loss of multiframe sync occurs at the CAS level. CRCCR1: CRC4 COUNT REGISTER 1 (Address = 02 Hex) CRCCR2: CRC4 COUNT REGISTER 2 (Address = 03 Hex) (MSB) * CRC7 * CRC6 * CRC5 * CRC4 * CRC3 * CRC2 CRC9 CRC1 SYMBOL POSITION CRC9 CRCCR1.1 MSB of the 10-Bit CRC4 error count CRC0 CRCCR2.0 LSB of the 10-Bit CRC4 error count (LSB) CRC8 CRC0 NAME AND DESCRIPTION *The upper 6 bits of CRCCR1 at address 02 are the most significant bits of the 12–bit FAS error counter. 51 of 117 CRCCR1 CRCCR2 DS21FT44/DS21FF44 E-Bit Counter E-bit Count Register 1 (EBCR1) is the most significant word and EBCR2 is the least significant word of a 10-bit counter that records Far End Block Errors (FEBE) as reported in the first bit of frames 13 and 15 on E1 lines running with CRC4 multiframe. These count registers will increment once each time the received E-bit is set to zero. Since the maximum E-bit count in a one second period is 1000, this counter cannot saturate. The counter is disabled during loss of sync at either the FAS or CRC4 level; it continues to count if loss of multiframe sync occurs at the CAS level. EBCR1: E-BIT COUNT REGISTER 1 (Address = 04 Hex) EBCR2: E-BIT COUNT REGISTER 2 (Address = 05 Hex) (MSB) * EB7 * EB6 * EB5 SYMBOL POSITION EB9 EB0 EBCR1.1 EBCR2.0 * EB4 * EB3 * EB2 EB9 EB1 (LSB) EB8 EB0 EBCR1 EBCR2 NAME AND DESCRIPTION MSB of the 10-Bit E-Bit Error Count LSB of the 10-Bit E-Bit Error Count *The upper 6 bits of EBCR1 at address 04 are the least significant bits of the 12-bit FAS error counter. FAS Error Counter FAS Count Register 1 (FASCR1) is the most significant word and FASCR2 is the least significant word of a 12-bit counter that records word errors in the Frame Alignment Signal in timeslot 0. This counter is disabled when RLOS is high. FAS errors are not counted when the framer is searching for FAS alignment and/or synchronization at either the CAS or CRC4 multiframe level. Since the maximum FAS word error count in a one-second period is 4000, this counter cannot saturate. FASCR1: FAS ERROR COUNT REGISTER 1 (Address = 02 Hex) FASCR2: FAS ERROR COUNT REGISTER 2 (Address = 04 Hex) (MSB) FAS11 FAS5 FAS10 FAS4 FAS9 FAS3 FAS8 FAS2 FAS7 FAS1 FAS6 FAS0 (Note 2) (Note 1) SYMBOL POSITION FAS11 FASCR1.7 MSB of the 12-Bit FAS Error Count FAS0 FASCR2.2 LSB of the 12-Bit FAS Error Count (LSB) (Note 2) (Note 1) FASCR1 FASCR2 NAME AND DESCRIPTION NOTES: 1) The lower 2 bits of FASCR1 at address 02 are the most significant bits of the 10-bit CRC4 error counter. 2) The lower 2 bits of FASCR2 at address 04 are the most significant bits of the 10-bit E-bit counter. 52 of 117 DS21FT44/DS21FF44 13. DS0 MONITORING FUNCTION Each framer in the DS21Q44 has the ability to monitor one DS0 64kbps channel in the transmit direction and one DS0 channel in the receive direction at the same time. In the transmit direction, the user determines which channel is to be monitored by properly setting the TCM0 to TCM4 bits in the CCR4 register. In the receive direction, the RCM0 to RCM4 bits in the CCR5 register need to be properly set. The DS0 channel pointed to by the TCM0 to TCM4 bits appear in the Transmit DS0 Monitor (TDS0M) register, and the DS0 channel pointed to by the RCM0 to RCM4 bits appear in the Receive DS0 (RDS0M) register. The TCM4 to TCM0 and RCM4 to RCM0 bits should be programmed with the decimal decode of the appropriate E1 channel. Channels 1–32 map to register values 0 through 31. For example, if DS0 channel 6 (timeslot 5) in the transmit direction and DS0 channel 15 (timeslot 14) in the receive direction needed to be monitored, then the following values would be programmed into CCR4 and CCR5: TCM4 = 0 TCM3 = 0 TCM2 = 1 TCM1 = 0 TCM0 = 1 RCM4 = 0 RCM3 = 1 RCM2 = 1 RCM1 = 1 RCM0 = 0 53 of 117 DS21FT44/DS21FF44 CCR4: COMMON CONTROL REGISTER 4 (Address=A8 Hex) [Repeated here from section 10 for convenience] (MSB) RLB – – TCM4 SYMBOL POSITION RLB CCR4.7 — — CCR4.6 CCR4.5 TCM4 CCR4.4 TCM3 TCM2 TCM1 TCM0 CCR4.3 CCR4.2 CCR4.1 CCR4.0 TCM3 TCM2 TCM1 (LSB) TCM0 NAME AND DESCRIPTION Remote Loopback 0 = loopback disabled 1 = loopback enabled Not Assigned. Should be set to zero when written. Not Assigned. Should be set to zero when written. Transmit Channel Monitor Bit 4. MSB of a channel decode that determines which transmit channel data appears in the TDS0M register (Section 13). Transmit Channel Monitor Bit 3 Transmit Channel Monitor Bit 2 Transmit Channel Monitor Bit 1 Transmit Channel Monitor Bit 0. LSB of the channel decode TDS0M: TRANSMIT DS0 MONITOR REGISTER (Address=A9 Hex) (MSB) B1 B2 B3 B4 B5 B6 B7 (LSB) B8 SYMBOL POSITION B1 TDS0M.7 B2 TDS0M.6 NAME AND DESCRIPTION Transmit DS0 Channel Bit 1. MSB of the DS0 channel (first bit to be transmitted). Transmit DS0 Channel Bit 2 B3 TDS0M.5 Transmit DS0 Channel Bit 3 B4 B5 B6 TDS0M.4 TDS0M.3 TDS0M.2 Transmit DS0 Channel Bit 4 Transmit DS0 Channel Bit 5 Transmit DS0 Channel Bit 6 B7 TDS0M.1 B8 TDS0M.0 Transmit DS0 Channel Bit 7 Transmit DS0 Channel Bit 8. LSB of the DS0 channel (last bit to be transmitted). 54 of 117 DS21FT44/DS21FF44 CCR5: COMMON CONTROL REGISTER 5 (Address = AA Hex) (Repeated here from Section 10.) (MSB) — RESALGN TESALGN SYMBOL POSITION – CCR5.7 RCM4 RCM3 RCM2 RCM1 (LSB) RCM0 NAME AND DESCRIPTION Not Assigned. Should be set to zero when written. RESALGN CCR5.6 TESALGN CCR5.5 RCM4 CCR5.4 RCM3 CCR5.3 Receive Elastic Store Align. Setting this bit from a zero to a one may force the receive elastic store’s write/read pointers to a minimum separation of half a frame. No action will be taken if the pointer separation is already greater or equal to half a frame. If pointer separation is less then half a frame, the command will be executed and data will be disrupted. Should be toggled after RSYSCLK has been applied and is stable. Must be cleared and set again for a subsequent align (Section 17). Transmit Elastic Store Align. Setting this bit from a zero to a one may force the transmit elastic store’s write/read pointers to a minimum separation of half a frame. No action will be taken if the pointer separation is already greater or equal to half a frame. If pointer separation is less then half a frame, the command will be executed and data will be disrupted. Should be toggled after TSYSCLK has been applied and is stable. Must be cleared and set again for a subsequent align (Section 17). Receive Channel Monitor Bit 4. MSB of a channel decode that determines which receive channel data will appear in the RDS0M register (Section 13). Receive Channel Monitor Bit 3 RCM2 CCR5.2 Receive Channel Monitor Bit 2 RCM1 CCR5.1 Receive Channel Monitor Bit 1 RCM0 CCR5.0 Receive Channel Monitor Bit 0. LSB of the channel decode. 55 of 117 DS21FT44/DS21FF44 RDS0M: RECEIVE DS0 MONITOR REGISTER (Address = AB Hex) (MSB) B1 B2 B3 B4 B5 B6 B7 (LSB) B8 SYMBOL POSITION B1 RDS0M.7 B2 RDS0M.6 Receive DS0 Channel Bit 1. MSB of the DS0 channel (first bit to be received) Receive DS0 Channel Bit 2 B3 B4 RDS0M.5 RDS0M.4 Receive DS0 Channel Bit 3 Receive DS0 Channel Bit 4 B5 RDS0M.3 Receive DS0 Channel Bit 5 B6 B7 RDS0M.2 RDS0M.1 B8 RDS0M.0 Receive DS0 Channel Bit 6 Receive DS0 Channel Bit 7 Receive DS0 Channel Bit 8. LSB of the DS0 channel (last bit to be received) 14. NAME AND DESCRIPTION SIGNALING OPERATION Each framer in the DS21Q44 contains provisions for both processor based (i.e., software based) signaling bit access and for hardware based access. Both the processor based access and the hardware-based access can be used simultaneously if necessary. The processor based signaling is covered in Section 14.1 and the hardware based signaling is covered in Section 14.2. 14.1. Processor-Based Signaling The Channel Associated Signaling (CAS) bits embedded in the E1 stream can be extracted from the receive stream and inserted into the transmit stream by the framer. Each of the 30 voice channels has four signaling bits (A/B/C/D) associated with it. The numbers in parenthesis () are the voice channel associated with a particular signaling bit. The voice channel numbers have been assigned as described in the ITU documents. Please note that this is different than the channel numbering scheme (1 to 32) that is used in the rest of the data sheet. For example, voice channel 1 is associated with timeslot 1 (Channel 2) and voice Channel 30 is associated with timeslot 31 (Channel 32). There is a set of 16 registers for the receive side (RS1 to RS16) and 16 registers on the transmit side (TS1 to TS16). The signaling registers are detailed below. 56 of 117 DS21FT44/DS21FF44 RS1 TO RS16: RECEIVE SIGNALING REGISTERS (Address = 30 to 3F Hex) (MSB) 0 A(1) A(2) A(3) A(4) A(5) A(6) A(7) A(8) A(9) A(10) A(11) A(12) A(13) A(14) A(15) 0 B(1) B(2) B(3) B(4) B(5) B(6) B(7) B(8) B(9) B(10) B(11) B(12) B(13) B(14) B(15) SYMBOL X Y A(1) D(30) 0 C(1) C(2) C(3) C(4) C(5) C(6) C(7) C(8) C(9) C(10) C(11) C(12) C(13) C(14) C(15) 0 D(1) D(2) D(3) D(4) D(5) D(6) D(7) D(8) D(9) D(10) D(11) D(12) D(13) D(14) D(15) POSITION RS1.0/1/3 RS1.2 RS2.7 RS16.0 X A(16) A(17) A(18) A(19) A(20) A(21) A(22) A(23) A(24) A(25) A(26) A(27) A(28) A(29) A(30) Y B(16) B(17) B(18) B(19) B(20) B(21) B(22) B(23) B(24) B(25) B(26) B(27) B(28) B(29) B(30) X C(16) C(17) C(18) C(19) C(20) C(21) C(22) C(23) C(24) C(25) C(26) C(27) C(28) C(29) C(30) (LSB) X D(16) D(17) D(18) D(19) D(20) D(21) D(22) D(23) D(24) D(25) D(26) D(27) D(28) D(29) D(30) RS1 (30) RS2 (31) RS3 (32) RS3 (33) RS5 (34) RS6 (35) RS7 (36) RS8 (37) RS9 (38) RS10 (39) RS11 (3A) RS12 (3B) RS13 (3C) RS14 (3D) RS15 (3E) RS16 (3F) NAME AND DESCRIPTION Spare Bits Remote Alarm Bit (integrated and reported in SR1.6) Signaling Bit A for Channel 1 Signaling Bit D for Channel 30 Each Receive Signaling Register (RS1 to RS16) reports the incoming signaling from two timeslots. The bits in the Receive Signaling Registers are updated on multiframe boundaries so the user can utilize the Receive Multiframe Interrupt in the Receive Status Register 2 (SR2.7) to know when to retrieve the signaling bits. The user has a full 2ms to retrieve the signaling bits before the data is lost. The RS registers are updated under all conditions. Their validity should be qualified by checking for synchronization at the CAS level. In CCS signaling mode, RS1 to RS16 can also be used to extract signaling information. By the SR2.7 bit, the user will be informed when the signaling registers have been loaded with data. The user has 2ms to retrieve the data before it is lost. The signaling data reported in RS1 to RS16 is also available at the RSIG and RSER pins. Three status bits in Status Register 1 (SR1) monitor the contents of registers RS1 through RS16. Status monitored includes all zeros detection, all ones detection and a change in register contents. The Receive Signaling All Zeros status bit (SR1.5) is set when over a full multiframe, RS1 through RS16 contain all zeros. The Receive Signaling All Ones status bit (SR1.7) is set when over a full multiframe, RS1 through RS16 contain less than three zeros. A change in the contents of RS1 through RS16 from one multiframe to the next will cause RSA1 (SR1.7) and RSA0 (SR1.5) status bits to be set at the same time. The user can enable the INT* pin to toggle low upon detection of a change in signaling by setting either the IMR1.7 or IMR1.5 bit. Once a signaling change has been detected, the user has at least 1.75ms to read the data out of the RS1 to RS16 registers before the data will be lost. 57 of 117 DS21FT44/DS21FF44 TS1 TO TS16: TRANSMIT SIGNALING REGISTERS (Address = 40 to 4F Hex) (MSB) 0 A(1) A(2) A(3) A(4) A(5) A(6) A(7) A(8) A(9) A(10) A(11) A(12) A(13) A(14) A(15) 0 B(1) B(2) B(3) B(4) B(5) B(6) B(7) B(8) B(9) B(10) B(11) B(12) B(13) B(14) B(15) SYMBOL X Y A(1) D(30) 0 C(1) C(2) C(3) C(4) C(5) C(6) C(7) C(8) C(9) C(10) C(11) C(12) C(13) C(14) C(15) POSITION TS1.0/1/3 TS1.2 TS2.7 TS16.0 0 D(1) D(2) D(3) D(4) D(5) D(6) D(7) D(8) D(9) D(10) D(11) D(12) D(13) D(14) D(15) X A(16) A(17) A(18) A(19) A(20) A(21) A(22) A(23) A(24) A(25) A(26) A(27) A(28) A(29) A(30) Y B(16) B(17) B(18) B(19) B(20) B(21) B(22) B(23) B(24) B(25) B(26) B(27) B(28) B(29) B(30) X C(16) C(17) C(18) C(19) C(20) C(21) C(22) C(23) C(24) C(25) C(26) C(27) C(28) C(29) C(30) (LSB) X D(16) D(17) D(18) D(19) D(20) D(21) D(22) D(23) D(24) D(25) D(26) D(27) D(28) D(29) D(30) TS1 (40) TS2 (41) TS3 (42) TS4 (43) TS5 (44) TS6 (45) TS7 (46) TS8 (47) TS9 (48) TS10 (49) TS11 (4A) TS12 (4B) TS13 (4C) TS14 (4D) TS15 (4E) TS16 (4F) NAME AND DESCRIPTION Spare Bits Remote Alarm Bit (integrated and reported in SR1.6) Signaling Bit A for Channel 1 Signaling Bit D for Channel 30 Each Transmit Signaling Register (TS1 to TS16) contains the CAS bits for two timeslots that will be inserted into the outgoing stream if enabled to do so by TCR1.5. On multiframe boundaries, the framer will load the values present in the Transmit Signaling Register into an outgoing signaling shift register that is internal to the device. The user can utilize the Transmit Multiframe bit in Status Register 2 (SR2.5) to know when to update the signaling bits. The bit will be set every 2ms and the user has 2ms to update the TSR’s before the old data will be retransmitted. ITU specifications recommend that the ABCD signaling not be set to all zeros because they will emulate a CAS multiframe alignment word. The TS1 register is special because it contains the CAS multiframe alignment word in its upper nibble. The upper nibble must always be set to 0000 or else the terminal at the far end will lose multiframe synchronization. If the user wishes to transmit a multiframe alarm to the far end, then the TS1.2 bit should be set to a one. If no alarm is to be transmitted, then the TS1.2 bit should be cleared. The three remaining bits in TS1 are the spare bits. If they are not used, they should be set to one. In CCS signaling mode, TS1 to TS16 can also be used to insert signaling information. By the SR2.5 bit, the user will be informed when the signaling registers need to be loaded with data. The user has 2 ms to load the data before the old data will be retransmitted. By the CCR3.6 bit, the user has the option to use the Transmit Channel Blocking Registers (TCBRs) to deter-mine on a channel by channel basis, which signaling bits are to be inserted by the TSRs (the corresponding bit in the TCBRs = 1) and which are to be sourced from the TSER or TSIG pin (the corresponding bit in the TCBRs = 0). See the Transmit Data Flow diagram in Section 22 for more details. 58 of 117 DS21FT44/DS21FF44 14.2. Hardware-Based Signaling Receive Side In the receive side of the hardware based signaling, there are two operating modes for the signaling buffer; signaling extraction and signaling re–insertion. Signaling extraction involves pulling the signaling bits from the receive data stream and buffering them over a four multiframe buffer and outputting them in a serial PCM fashion on a channel–by–channel basis at the RSIG output. This mode is always enabled. In this mode, the receive elastic store may be enabled or disabled. If the receive elastic store is enabled, then the backplane clock (RSYSCLK) must be 2.048 MHz. The ABCD signaling bits are output on RSIG in the lower nibble of each channel. The RSIG data is updated once a multiframe (2 ms) unless a freeze is in effect. See the timing diagrams in Section 22 for some examples. The other hardware based signaling operating mode called signaling re–insertion can be invoked by setting the RSRE control bit high (CCR3.3=1). In this mode, the user will provide a multiframe sync at the RSYNC pin and the signaling data be re–aligned at the RSER output according to this applied multiframe boundary in this mode, the elastic store must be enabled the backplane clock must be 2.048 MHz. The signaling data in the two multiframe buffer will be frozen in a known good state upon either a loss of synchronization (OOF event), carrier loss, or frame slip. To allow this freeze action to occur, the RFE control bit (CCR2.0) should be set high. The user can force a freeze by setting the RFF control bit (CCR2.1) high. Setting the RFF bit high causes the same freezing action as if a loss of synchronization, carrier loss, or slip has occurred. The 2 multiframe buffer provides an approximate 1 multiframe delay in the signaling bits provided at the RSIG pin (and at the RSER pin if RSRE=1 by CCR3.3). When freezing is enabled (RFE=1), the signaling data will be held in the last known good state until the corrupting error condition subsides. When the error condition sub-sides, the signaling data will be held in the old state for an additional 3 ms to 5 ms before being allowed to be updated with new signaling data. Transmit Side By the THSE control bit (CCR3.2), the DS21Q44 can be set up to take the signaling data presented at the TSIG pin and insert the signaling data into the PCM data stream that is being input at the TSER pin. The hardware signaling insertion capabilities of each framer are available whether the transmit side elastic store is enabled or disabled. If the transmit side elastic store is enabled, the backplane clock (TSYSCLK) must be 2.048 MHz. When hardware signaling insertion is enabled on a framer (THSE=1), then the user must enable the Transmit Channel Blocking Register Function Select (TCBFS) control bit (CCR3.6=1). This is needed so that the CAS multiframe alignment word, multiframe remote alarm, and spare bits can be added to timeslot 16 in frame 0 of the multiframe. The TS1 register should be programmed with the proper information. If CCR3.6=1, then a zero in the TCBRs implies that signaling data is to be sourced from TSER (or TSIG if CCR3.2=1) and a one implies that signaling data for that channel is to be sourced from the Transmit Signaling (TS) registers. See definition below. 59 of 117 DS21FT44/DS21FF44 TCBR1/TCBR2/TCBR3/TCBR4: DEFINITION WHEN CCR3.6 = 1 (MSB) CH20 CH24 CH28 CH32 CH4 CH8 CH12 CH16 CH19 CH23 CH27 CH31 CH3 CH7 CH11 CH15 CH18 CH22 CH26 CH30 CH2 CH6 CH10 CH14 CH17* CH21 CH25 CH29 (LSB) CH1* CH5 CH9 CH13 TCBR1(22) TCBR2(23) TCBR3(24) TCBR4(25) *CH1 and CH17 should be set to one to allow the internal TS1 register to create the CAS Multiframe Alignment Word and Spare/Remote Alarm bits. The user can also take advantage of this functionality to intermix signaling data from the TSIG pin and from the internal Transmit Signaling Registers (TS1 to TS16). As an example, assume that the user wishes to source all the signaling data except for voice channels 5 and 10 from the TSIG pin. In this application, the following bits and registers would be programmed as follows: CONTROL BITS THSE = 1 (CCR3.2) TCBFS = 1 (CCR3.6) T16S = 1(TCR1.5) 15. REGISTER VALUES TS1 = 0Bh (MF alignment word, remote alarm etc.) TCBR1 = 03h (source timeslot 16, frame 1 data) TCBR2 = 01h (source voice Channel 5 signaling data from TS6) TCBR3 = 04h (source voice Channel 10 signaling data from TS11) TCBR4 = 00h PER-CHANNEL CODE GENERATION AND LOOPBACK Each framer in the DS21Q44 can replace data on a channel–by–channel basis in both the transmit and receive directions. The transmit direction is from the backplane to the E1 line and is covered in Section 15.1. The receive direction is from the E1 line to the backplane and is covered in Section 15.2. 15.1. Transmit Side Code Generation In the transmit direction there are two methods by which channel data from the backplane can be overwritten with data generated by the framer. The first method which is covered in Section 15.1.1 was a feature contained in the original DS21Q43 while the second method which is covered in Section 15.1.2 is a new feature of the DS21Q44. 15.1.1. Simple Idle Code Insertion and Per-Channel Loopback The first method involves using the Transmit Idle Registers (TIR1/2/3/4) to determine which of the 32 E1 channels should be overwritten with the code placed in the Transmit Idle Definition Register (TIDR). This method allows the same 8–bit code to be placed into any of the 32 E1 channels. If this method is used, then the CCR3.5 control bit must be set to zero. Each of the bit position in the Transmit Idle Registers (TIR1/TIR2/TIR3/TIR4) represent a DS0 channel in the outgoing frame. When these bits are set to a one, the corresponding channel will transmit the Idle Code contained in the Transmit Idle Definition Register (TIDR). 60 of 117 DS21FT44/DS21FF44 The Transmit Idle Registers (TIRs) have an alternate function that allow them to define a Per–Channel LoopBack (PCLB). If the TIRFS control bit (CCR3.5) is set to one, then the TIRs will determine which channels (if any) from the backplane should be replaced with the data from the receive side or in other words, off of the E1 line. If this mode is enabled, then transmit and receive clocks and frame syncs must be synchronized. One method to accomplish this would be to tie RCLK to TCLK and RFSYNC to TSYNC. There are no restrictions on which channels can be looped back or on how many channels can be looped back. TIR1/TIR2/TIR3: TRANSMIT IDLE REGISTERS (Address = 26 to 29 Hex) (Also used for Per-Channel Loopback) (MSB) CH8 CH16 CH24 CH32 CH7 CH15 CH23 CH31 CH6 CH14 CH22 CH30 SYMBOL POSITION CH1 –32 TIR1.0–4.7 CH5 CH13 CH21 CH29 CH4 CH12 CH20 CH28 CH3 CH11 CH19 CH27 CH2 CH10 CH18 CH26 (LSB) CH1 CH9 CH17 CH25 TIR1 (26) TIR2 (27) TIR3 (28) TIR4 (29) NAME AND DESCRIPTION Transmit Idle Code Insertion Control Bits 0 = do not insert the Idle Code in the TIDR into this channel 1 = insert the Idle Code in the TIDR into this channel Note: If CCR3.5 = 1, then a 0 in the TIRs implies that channel data is to be sourced from TSER and a one implies that channel data is to be sourced from the output of the receive side framer (i.e., Per-Channel Loopback; see Figure 6–1). TIDR: TRANSMIT IDLE DEFINITION REGISTER (Address = 2A Hex) (MSB) TIDR7 TIDR6 TIDR5 TIDR4 TIDR3 TIDR2 TIDR1 SYMBOL POSITION TIDR7 TIDR.7 MSB of the Idle Code (this bit is transmitted first) TIDR0 TIDR.0 LSB of the Idle Code (this bit is transmitted last) 15.1.2. (LSB) TIDR0 NAME AND DESCRIPTION Per-Channel Code Insertion The second method involves using the Transmit Channel Control Registers (TCC1/2/3/4) to determine which of the 32 E1 channels should be overwritten with the code placed in the Transmit Channel Registers (TC1 to TC32). This method is more flexible than the first in that it allows a different 8-bit code to be placed into each of the 32 E1 channels. 61 of 117 DS21FT44/DS21FF44 TC1 TO TC32: TRANSMIT CHANNEL REGISTERS (Address = 60 to 7F Hex) (for brevity, only channel one is shown; see Table 8-1 for other register address) (MSB) C7 C6 C5 C4 C3 C2 C1 (LSB) C0 SYMBOL POSITION C7 TC1.7 MSB of the Code (this bit is transmitted first) C0 TC1.0 LSB of the Code (this bit is transmitted last) TC1 (60) NAME AND DESCRIPTION TCC1/TCC2/TCC3/TCC4: TRANSMIT CHANNEL CONTROL REGISTER (Address = A0 to A3 Hex) (MSB) CH8 CH16 CH24 CH32 CH7 CH15 CH23 CH31 SYMBOL CH6 CH14 CH22 CH30 CH5 CH13 CH21 CH29 CH4 CH12 CH20 CH28 POSITION CH1–32 CH3 CH11 CH19 CH27 CH2 CH10 CH18 CH26 (LSB) CH1 CH9 CH17 CH25 TCC1 (A0) TCC2 (A1) TCC3 (A2) TCC4 (A3) NAME AND DESCRIPTION Transmit Code Insertion Control Bits 0 = do not insert data from the TC register into the transmit data stream 1 = insert data from the TC register into the transmit data stream TCC1.0–4.7 15.2. Receive Side Code Generation On the receive side, the Receive Channel Control Registers (RCC1/2/3/4) are used to determine which of the 32 E1 channels off of the E1 line and going to the backplane should be overwritten with the code placed in the Receive Channel Registers (RC1 to RC32). This method allows a different 8–bit code to be placed into each of the 32 E1 channels. RC1 TO RC32: RECEIVE CHANNEL REGISTERS (Address = 80 to 9F Hex) (For brevity, only channel one is shown; see Table 8-1 for other register address) (MSB) C7 C6 C5 C4 C3 C2 C1 (LSB) C0 RC1 (80) SYMBOL POSITION NAME AND DESCRIPTION C7 RC1.7 MSB of the Code (this bit is sent first to the backplane) C0 RC1.0 LSB of the Code (this bit is sent last to the backplane) 62 of 117 DS21FT44/DS21FF44 RCC1/RCC2/RCC3/RCC4: RECEIVE CHANNEL CONTROL REGISTER (Address = A4 to A7 Hex) (MSB) CH8 CH16 CH24 CH32 CH7 CH15 CH23 CH31 SYMBOL CH1–32 16. CH6 CH14 CH22 CH30 CH5 CH13 CH21 CH29 CH4 CH12 CH20 CH28 CH3 CH11 CH19 CH27 CH2 CH10 CH18 CH26 (LSB) CH1 CH9 CH17 CH25 RCC1 (A4) RCC2 (A5) RCC3 (A6) RCC4 (A7) POSITION NAME AND DESCRIPTION RCC1.0–4.7 Receive Code Insertion Control Bits 0 = do not insert data from the RC register into the receive data stream 1 = insert data from the RC register into the receive data stream CLOCK BLOCKING REGISTERS The Receive Channel blocking Registers (RCBR1/RCBR2/RCBR3/RCBR4) and the Transmit Channel Blocking Registers (TCBR1/TCBR2/TCBR3/TCBR4) control RCHBLK and TCHBLK pins respectively. (The RCHBLK and TCHBLK pins are user programmable outputs that can be forced either high or low during individual channels). These outputs can be used to block clocks to a USART or LAPD controller in ISDN–PRI applications. When the appropriate bits are set to a one, the RCHBLK and TCHBLK pin will be held high during the entire corresponding channel time. See the timing in Section 22 for an example. The TCBRs have alternate mode of use. By the CCR3.6 bit, the user has the option to use the TCBRs to determine on a channel by channel basis, which signaling bits are to be inserted by the TSRs (the corresponding bit in the TCBRs = 1) and which are to be sourced from the TSER or TSIG pins (the corresponding bit in the TCBR = 0). See the timing in Section 22 for an example. RCBR1/RCBR2/RCBR3/RCBR4: RECEIVE CHANNEL BLOCKING REGISTERS (Address = 2B to 2E Hex) (MSB) CH8 CH16 CH24 CH32 CH7 CH15 CH23 CH31 SYMBOL CH1–32 CH6 CH14 CH22 CH30 CH5 CH13 CH21 CH29 POSITION RCBR1.0–4.7 CH4 CH12 CH20 CH28 CH3 CH11 CH19 CH27 CH2 CH10 CH18 CH26 (LSB) CH1 CH9 CH17 CH25 RCBR1 (2B) RCBR2 (2C) RCBR3 (2D) RCBR4 (2E) NAME AND DESCRIPTION Receive Channel Blocking Control Bits 0 = force the RCHBLK pin to remain low during this channel time 1 = force the RCHBLK pin high during this channel time 63 of 117 DS21FT44/DS21FF44 TCBR1/TCBR2/TCBR3/TCBR4: TRANSMIT CHANNEL BLOCKING REGISTERS (Address = 22 to 25 Hex) (MSB) CH8 CH16 CH24 CH32 CH7 CH15 CH23 CH31 CH6 CH14 CH22 CH30 CH5 CH13 CH21 CH29 SYMBOL POSITION CH1–32 TCBR1.0–4.7 CH4 CH12 CH20 CH28 CH3 CH11 CH19 CH27 CH2 CH10 CH18 CH26 (LSB) CH1 CH9 CH17 CH25 TCBR1 (22) TCBR2 (23) TCBR3 (24) TCBR4 (25) NAME AND DESCRIPTION Transmit Channel Blocking Control Bits 0 = force the TCHBLK pin to remain low during this channel time 1 = force the TCHBLK pin high during this channel time Note: If CCR3.6 = 1, then a zero in the TCBRs implies that signaling data is to be sourced from TSER (or TSIG if CCR3.2 = 1) and a one implies that signaling data for that channel is to be sourced from the Transmit Signaling (TS) registers. See definition below. TCBR1/TCBR2/TCBR3/TCBR4: DEFINITION WHEN CCR3.6 = 1 (MSB) CH20 CH24 CH28 CH32 CH4 CH8 CH12 CH16 CH19 CH23 CH27 CH31 CH3 CH7 CH11 CH15 CH18 CH22 CH26 CH30 CH2 CH6 CH10 CH14 CH17* CH21 CH25 CH29 (LSB) CH1* CH5 CH9 CH13 TCBR1 (22) TCBR2 (23) TCBR3 (24) TCBR4 (25) *CH1 and CH17 should be set to one to allow the internal TS1 register to create the CAS Multiframe Alignment Word and Spare/Remote Alarm bits. 17. ELASTIC STORES OPERATION Each framer in the DS21Q44 contains dual two-frame (512 bits) elastic stores, one for the receive direction, and one for the transmit direction. These elastic stores have two main purposes. First, they can be used to rate convert the E1 data stream to 1.544Mbps (or a multiple of 1.544Mbps), which is the T1 rate. Secondly, they can be used to absorb the differences in frequency and phase between the E1 data stream and an asynchronous (i.e., not frequency locked) backplane clock, which can be 1.544MHz or 2.048MHz. The backplane clock can burst at rates up to 8.192MHz. Both elastic stores contain full controlled slip capability, which is necessary for this second purpose. Both elastic stores within a framer are fully independent and no restrictions apply to the sourcing of the various clocks that are applied to them. The transmit side elastic store can be enabled whether the receive elastic store is enabled or disabled and vice versa. Also, each elastic store can interface to either a 1.544MHz or 2.048MHz backplane without regard to the backplane rate the other elastic store is interfacing. Two mechanisms are available to the user for resetting the elastic stores. The Elastic Store Reset (CCR6.0 and CCR6.1) function forces the elastic stores to a depth of one frame unconditionally. Data is lost during the reset. The second method, the Elastic Store Align (CCR5.5 and CCR5.6) forces the elastic store depth to a minimum depth of half a frame only if the current pointer separation is already less then half a frame. If a realignment occurs data is lost. In both mechanisms, independent resets are provided for both the receive and transmit elastic stores. 64 of 117 DS21FT44/DS21FF44 17.1. Receive Side If the receive side elastic store is enabled (RCR2.1=1), then the user must provide either a 1.544MHz (RCR2.2 =0) or 2.048MHz (RCR2.2=1) clock at the RSYSCLK pin. The user has the option of either providing a frame/multiframe sync at the RSYNC pin (RCR1.5=1) or having the RSYNC pin provide a pulse on frame/multiframe boundaries (RCR1.5=0). If the user wishes to obtain pulses at the frame boundary, then RCR1.6 must be set to zero and if the user wishes to have pulses occur at the multiframe boundary, then RCR1.6 must be set to one. The DS21Q44 will always indicate frame boundaries by the RFSYNC output whether the elastic store is enabled or not. If the elastic store is enabled, then either CAS (RCR1.7=0) or CRC4 (RCR1.7=1) multiframe boundaries will be indicated by the RMSYNC output. If the user selects to apply a 1.544MHz clock to the RSYSCLK pin, then every fourth channel of the received E1 data is deleted and an F-bit position (which will be forced to one) is inserted. Hence, Channels 1, 5, 9, 13, 17, 21, 25, and 29 (timeslots 0, 4, 8, 12, 16, 20, 24, and 28) will be deleted from the received E1 data stream. Also, in 1.544MHz applications, the RCHBLK output will not be active in Channels 25 through 32 (or in other words, RCBR4 is not active). See Section 22 for timing details. If the 512-bit elastic buffer either fills or empties, a controlled slip will occur. If the buffer empties, then a full frame of data (256 bits) will be repeated at RSER and the SR1.4 and RIR.3 bits will be set to a one. If the buffer fills, then a full frame of data will be deleted and the SR1.4 and RIR.4 bits will be set to a one. 17.2. Transmit Side The operation of the transmit elastic store is very similar to the receive side. The transmit side elastic store is enabled by CCR3.7. A 1.544MHz (CCR3.1=0) or 2.048MHz (CCR3.1=1) clock can be applied to the TSYSCLK input. The TSYSCLK can be a bursty clock with rates up to 8.192MHz. If the user selects to apply a 1.544MHz clock to the TSYSCLK pin, then the data sampled at TSER will be ignored every fourth channel. Hence, Channels 1, 5, 9, 13, 17, 21, 25, and 29 (timeslots 0, 4, 8, 12, 16, 20, 24, and 28) are ignored. The user must supply an 8kHz frame sync pulse to the TSSYNC input. See Section 22 for timing details. Controlled slips in the transmit elastic store are reported in the SR2.0 bit and the direction of the slip is reported in the RIR.6 and RIR.7 bits. 18. ADDITIONAL (Sa) AND INTERNATIONAL (Si) BIT OPERATION Each framer in the DS21Q44 provides for access to both the Sa and the Si bits by three different methods. The first is by a hardware scheme using the RLINK/RLCLK and TLINK/ TLCLK pins. The first method is discussed in Section 18.1. The second involves using the internal RAF/RNAF and TAF/TNAF registers and is discussed in Section 18.2 The third method which is covered in Section 18.3 involves an expanded version of the second method and is one of the features added to the DS21Q44 from the original DS21Q43 definition. 18.1. Hardware Scheme On the receive side, all of the received data is reported at the RLINK pin. Through RCR2, the user can control the RLCLK pin to pulse during any combination of Sa bits. This allows the user to create a clock that can be used to capture the needed Sa bits. If RSYNC is programmed to output a frame boundary, it will identify the Si bits. See Section 22 for detailed timing. On the transmit side, the individual Sa bits can be either sourced from the internal TNAF register (see Section 18.2 for details) or from the external TLINK pin. Through TCR2, the framer can be programmed to source any combination of the additional bits from the TLINK pin. If the user wishes to pass the Sa bits through the framer without them being altered, then the device should be set up to source all five Sa bits by the TLINK pin and the TLINK pin should be connected to the TSER pin. Si bits can be inserted through the TSER pin by the clearing of the TCR1.3 bit. See the timing diagrams and the transmit data flow diagram in Section 22 for examples. 65 of 117 DS21FT44/DS21FF44 18.2. Internal Register Scheme Based On Double-Frame On the receive side, the RAF and RNAF registers will always report the data as it received in the Additional and International bit locations. The RAF and RNAF registers are updated with the setting of the Receive Align Frame bit in Status Register 2 (SR2.6). The host can use the SR2.6 bit to know when to read the RAF and RNAF registers. It has 250µs to retrieve the data before it is lost. On the transmit side, data is sampled from the TAF and TNAF registers with the setting of the Transmit Align Frame bit in Status Register 2 (SR2.3). The host can use the SR2.3 bit to know when to update the TAF and TNAF registers. It has 250µs to update the data or else the old data will be retransmitted. Data in the Si bit position will be overwritten if the framer is programmed: (1) to source the Si bits from the TSER pin, (2) in the CRC4 mode, or (3) have automatic E-bit insertion enabled. Data in the Sa bit position will be overwritten if any of the TCR2.3 to TCR2.7 bits are set to one (please see Section 18.1 for details). For more details, see the register descriptions for TCR1 and TCR2 and the transmit data flow diagram in Section 18. RAF: RECEIVE ALIGN FRAME REGISTER (Address = 2F Hex) (MSB) Si 0 SYMBOL Si 0 0 1 1 0 1 1 0 POSITION RAF.7 RAF.6 RAF.5 RAF.4 RAF.3 RAF.2 RAF.1 RAF.0 1 1 0 1 (LSB) 1 NAME AND DESCRIPTION International Bit Frame Alignment Signal Bit Frame Alignment Signal Bit Frame Alignment Signal Bit Frame Alignment Signal Bit Frame Alignment Signal Bit Frame Alignment Signal Bit Frame Alignment Signal Bit RNAF: RECEIVE NON-ALIGN FRAME REGISTER (Address = 1F Hex) (MSB) Si SYMBOL Si 1 A Sa4 Sa5 Sa6 Sa7 Sa8 1 A POSITION RNAF.7 RNAF.6 RNAF.5 RNAF.4 RNAF.3 RNAF.2 RNAF.1 RNAF.0 Sa4 Sa5 Sa6 Sa7 NAME AND DESCRIPTION International Bit Frame Non-Alignment Signal Bit Remote Alarm Additional Bit 4 Additional Bit 5 Additional Bit 6 Additional Bit 7 Additional Bit 8 66 of 117 (LSB) Sa8 DS21FT44/DS21FF44 TAF: TRANSMIT ALIGN FRAME REGISTER (Address = 20 Hex) (MSB) Si 0 0 1 1 0 1 (LSB) 1 (Must be programmed with the 7-bit FAS word; the DS21Q44 does not automatically set these bits.) SYMBOL POSITION NAME AND DESCRIPTION Si 0 0 TAF.7 TAF.6 TAF.5 International Bit Frame Alignment Signal Bit Frame Alignment Signal Bit 1 TAF.4 Frame Alignment Signal Bit 1 0 1 TAF.3 TAF.2 TAF.1 Frame Alignment Signal Bit Frame Alignment Signal Bit Frame Alignment Signal Bit 1 TAF.0 Frame Alignment Signal Bit TNAF: TRANSMIT NON-ALIGN FRAME REGISTER (Address = 21 Hex) (MSB) Si 1 A Sa4 Sa5 Sa6 Sa7 (Bit 2 must be programmed to one; the DS21Q44 does not automatically set this bit.) SYMBOL POSITION NAME AND DESCRIPTION Si TNAF.7 International Bit 1 TNAF.6 Frame Non-Alignment Signal Bit A TNAF.5 Remote Alarm (used to transmit the alarm) Sa4 Sa5 Sa6 TNAF.4 TNAF.3 TNAF.2 Additional Bit 4 Additional Bit 5 Additional Bit 6 Sa7 TNAF.1 Additional Bit 7 Sa8 TNAF.0 Additional Bit 8 67 of 117 (LSB) Sa8 DS21FT44/DS21FF44 18.3. Internal Register Scheme Based On CRC4 Multiframe On the receive side, there is a set of eight registers (RSiAF, RSiNAF, RRA, RSa4 to RSa8) that report the Si and Sa bits as they are received. These registers are updated with the setting of the Receive CRC4 Multiframe bit in Status Register 2 (SR2.1). The host can use the SR2.1 bit to know when to read these registers. The user has 2ms to retrieve the data before it is lost. The MSB of each register is the first received. Please see the register descriptions below and the Transmit Data Flow diagram in Section 22 for more details. On the transmit side, there is also a set of eight registers (TSiAF, TSiNAF, TRA, TSa4 to TSa8) that by the Transmit Sa Bit Control Register (TSaCR), can be programmed to insert both Si and Sa data. Data is sampled from these registers with the setting of the Transmit Multiframe bit in Status Register 2 (SR2.5). The host can use the SR2.5 bit to know when to update these registers. It has 2ms to update the data or else the old data will be retransmitted. The MSB of each register is the first bit transmitted. Please see the register descriptions below and the Transmit Data Flow diagram in Section 22 for more details. REGISTER ADDRESS (HEX) FUNCTION RSiAF RSiNAF RRA 58 59 5A The eight Si bits in the align frame. The eight Si bits in the non–align frame. The eight reportings of the receive remote alarm (RA). RSa4 RSa5 RSa6 5B 5C 5D The eight Sa4 reported in each CRC4 multiframe. The eight Sa5 reported in each CRC4 multiframe. The eight Sa6 reported in each CRC4 multiframe. RSa7 RSa8 TSiAF 5E 5F 50 The eight Sa7 reported in each CRC4 multiframe. The eight Sa8 reported in each CRC4 multiframe. The eight Si bits to be inserted into the align frame. TSiNAF 51 The eight Si bits to be inserted into the non-align frame. TRA TSa4 TSa5 52 53 54 The eight settings of remote alarm (RA). The eight Sa4 settings in each CRC4 multiframe. The eight Sa5 settings in each CRC4 multiframe. TSa6 TSa7 TSa8 55 56 57 The eight Sa6 settings in each CRC4 multiframe. The eight Sa7 settings in each CRC4 multiframe. The eight Sa8 settings in each CRC4 multiframe. 68 of 117 DS21FT44/DS21FF44 TSaCR: TRANSMIT Sa BIT CONTROL REGISTER (Address = 1C Hex) (MSB) SiAF SYMBOL SiNAF RA POSITION SiAF TSaCR.7 SiNAF TSaCR.6 RA TSaCR.5 Sa4 TSaCR.4 Sa5 TSaCR.3 Sa6 TSaCR.2 Sa7 TSaCR.1 Sa8 TSaCR.0 Sa4 Sa5 Sa6 Sa7 (LSB) Sa8 NAME AND DESCRIPTION International Bit in Align Frame Insertion Control Bit 0 = do not insert data from the TSiAF register into the transmit data stream 1 = insert data from the TSiAF register into the transmit data stream International Bit in Non-Align Frame Insertion Control Bit 0 = do not insert data from the TSiNAF register into the transmit data stream 1 = insert data from the TSiNAF register into the transmit data stream Remote Alarm Insertion Control Bit 0 = do not insert data from the TRA register into the transmit data stream 1 = insert data from the TRA register into the transmit data stream Additional Bit 4 Insertion Control Bit 0 = do not insert data from the TSa4 register into the transmit data stream 1 = insert data from the TSa4 register into the transmit data stream Additional Bit 5 Insertion Control Bit 0 = do not insert data from the TSa5 register into the transmit data stream 1 = insert data from the TSa5 register into the transmit data stream Additional Bit 6 Insertion Control Bit 0 = do not insert data from the TSa6 register into the transmit data stream 1 = insert data from the TSa6 register into the transmit data stream Additional Bit 7 Insertion Control Bit 0 = do not insert data from the TSa7 register into the transmit data stream 1 = insert data from the TSa7 register into the transmit data stream Additional Bit 8 Insertion Control Bit 0 = do not insert data from the TSa8 register into the transmit data stream 1 = insert data from the TSa8 register into the transmit data stream 69 of 117 DS21FT44/DS21FF44 19. HDLC Controller for the Sa Bits or DS0 Each framer in the DS21Q44 has the ability to extract/insert data from/ into the Sa bit positions (Sa4 to Sa8) or from/to any multiple of DS0 channels Each framer contains a complete HDLC controller and this operation is covered in Section 19.1. 19.1. General Overview Each framer contains a complete HDLC controller with 64–byte buffers in both the transmit and receive directions. The HDLC controller performs all the necessary overhead for generating and receiving a HDLC formatted message. The HDLC controller automatically generates and detects flags, generates and checks the CRC check sum, generates and detects abort sequences, stuffs and destuffs zeros (for transparency), and byte aligns to the HDLC data stream. There are eleven registers that the host will use to operate and control the operation of the HDLC controller. A brief description of the registers is shown in Table 19-1. 70 of 117 DS21FT44/DS21FF44 Table 19-1. HDLC CONTROLLER REGISTER LIST NAME FUNCTION HDLC Control Register (HCR) General control over the HDLC controller HDLC Status Register (HSR) Key status information for both transmit and receive directions HDLC Interrupt Mask Register (HIMR) Receive HDLC Information Register (RHIR) Receive HDLC FIFO Register (RHFR) Allows/stops status bits to/from causing an interrupt Status information on receive HDLC controller Access to 64-byte HDLC FIFO in receive direction Receive HDLC DS0 Control Register 1 (RDC1) Receive HDLC DS0 Control Register 2 Controls the HDLC function when used on DS0 channels (RDC2) Transmit HDLC Information Register (THIR) Transmit HDLC FIFO Register (THFR) Status information on transmit HDLC controller Access to 64–byte HDLC FIFO in transmit direction Transmit HDLC DS0 Control Register 1 (TDC1) Transmit HDLC DS0 Control Register 2 Controls the HDLC function when used on DS0 channels (TDC2) 19.2. HDLC Status Registers Three of the HDLC controller registers (HSR, RHIR, and THIR) provide status information. When a particular event has occurred (or is occurring), the appropriate bit in one of these three registers will be set to a one. Some of the bits in these three status registers are latched and some are real time bits that are not latched. Section 19.4 contains register descriptions that list which bits are latched and which are not. With the latched bits, when an event occurs and a bit is set to a one, it will remain set until the user reads that bit. The bit will be cleared when it is read and it will not be set again until the event has occurred again. The real time bits report the current instantaneous conditions that are occurring and the history of these bits is not latched. Like the other status registers in the framer, the user will always proceed a read of any of the three registers with a write. The byte written to the register will inform the framer which of the latched bits the user wishes to read and have cleared (the real time bits are not affected by writing to the status register). The user will write a byte to one of these registers, with a one in the bit positions he or she wishes to read and a zero in the bit positions he or she does not wish to obtain the latest information on. When a one is written to a bit location, the read register will be updated with current value and it will be cleared. When a zero is written to a bit position, the read register will not be updated and the previous value will be held. A write to the status and information registers will be immediately followed by a read of the same 71 of 117 DS21FT44/DS21FF44 register. The read result should be logically AND’ed with the mask byte that was just written and this value should be written back into the same register to insure that bit does indeed clear. This second write step is necessary because the alarms and events in the status registers occur asynchronously in respect to their access by the parallel port. This write-read-write (for polled-driven access) or write–read (for interrupt driven access) scheme allows an external microcontroller or microprocessor to individually poll certain bits without disturbing the other bits in the register. This operation is key in controlling the DS21Q44 with higher order software languages. Like the SR1 and SR2 status registers, the HSR register has the unique ability to initiate a hardware interrupt by the INT* output pin. Each of the events in the HSR can be either masked or unmasked from the interrupt pin by the HDLC Interrupt Mask Register (HIMR). Interrupts will force the INT* pin low when the event occurs. The INT* pin will be allowed to return high (if no other interrupts are present) when the user reads the event bit that caused the interrupt to occur. 19.3. BASIC OPERATION DETAILS As a basic guideline for interpreting and sending HDLC messages, the following sequences can be applied: Receive a HDLC Message 1) 2) 3) 4) 5) 6) 7) 8) Enable RPS interrupts. Wait for interrupt to occur. Disable RPS interrupt and enable either RPE, RNE, or RHALF interrupt. Read RHIR to obtain REMPTY status. a) If REMPTY = 0, then record OBYTE, CBYTE, and POK bits and then read the FIFO a1) If CBYTE = 0 then skip to Step 5 a2) If CBYTE = 1 then skip to Step 7 b) If REMPTY = 1, then skip to Step 6 Repeat Step 4. Wait for interrupt, skip to Step 4. If POK = 0, then discard whole packet, if POK = 1, accept the packet. Disable RPE, RNE, or RHALF interrupt, enable RPS interrupt and return to Step 1. Transmit a HDLC Message 1) Make sure HDLC controller is done sending any previous messages and is current sending flags by checking that the FIFO is empty by reading the TEMPTY status bit in the THIR register. 2) Enable either the THALF or TNF interrupt. 3) Read THIR to obtain TFULL status. a) If TFULL = 0, then write a byte into the FIFO and skip to next step (special case occurs when the last byte is to be written, in this case set TEOM = 1 before writing the byte and then skip to Step 6) b) If TFULL = 1, then skip to Step 5 4) Repeat Step 3. 5) Wait for interrupt, skip to Step 3. 6) Disable THALF or TNF interrupt and enable TMEND interrupt. 7) Wait for an interrupt, then read TUDR status bit to make sure packet was transmitted correctly. 72 of 117 DS21FT44/DS21FF44 19.4. HDLC REGISTER DESCRIPTION HCR: HDLC CONTROL REGISTER (Address=B0 Hex) (MSB) — RHR TFS SYMBOL POSITION — HCR.7 RHR HCR.6 TFS HCR.5 THR HCR.4 TABT HCR.3 TEOM HCR.2 TZSD HCR.1 TCRCD HCR.0 THR TABT TEOM TZSD (LSB) TCRCD NAME AND DESCRIPTION Not Assigned. Should be set to zero. Receive HDLC Reset. A 0-to-1 transition resets the receive HDLC controller. Must be cleared and set again for a subsequent reset. Transmit Flag/Idle Select 0 = 7Eh. 1 = FFh. Transmit HDLC Reset. A 0-to-1 transition resets the transmit HDLC controller. Must be cleared and set again for a subsequent reset. Transmit Abort. A 0-to-1 transition causes the FIFO contents to be dumped and one FEh abort to be sent followed by 7Eh or FFh flags/idle until a new packet is initiated by writing new data into the FIFO. Must be cleared and set again for a subsequent abort to be sent. Transmit End of Message. Should be set to a one just before the last data byte of a HDLC packet is written into the transmit FIFO at THFR. The HDLC controller will clear this bit when the last byte has been transmitted. Transmit Zero Stuffer Defeat. Overrides internal enable. 0 = enable the zero stuffer (normal operation) 1 = disable the zero stuffer Transmit CRC Defeat 0 = enable CRC generation (normal operation) 1 = disable CRC generation 73 of 117 DS21FT44/DS21FF44 HSR: HDLC STATUS REGISTER (Address = B1 Hex) (MSB) — RPE RPS RHALF RNE THALF TNF (LSB) TMEND SYMBOL POSITION NAME AND DESCRIPTION — HSR.7 RPE HSR.6 RPS HSR.5 RHALF HSR.4 RNE HSR.3 THALF HSR.2 TNF HSR.1 TMEND HSR.0 Not Assigned. Should be set to zero. Receive Packet End. Set when the HDLC controller detects either the finish of a valid message (i.e., CRC check complete) or when the controller has experienced a message fault such as a CRC checking error, or an overrun condition, or an abort has been seen. The setting of this bit prompts the user to read the RHIR register for details. Receive Packet Start. Set when the HDLC controller detects an opening byte. The setting of this bit prompts the user to read the RHIR register for details. Receive FIFO Half Full. Set when the receive 64 byte FIFO fills beyond the half-way point. The setting of this bit prompts the user to read the RHIR register for details. Receive FIFO Not Empty. Set when the receive 64 byte FIFO has at least 1 byte available for a read. The setting of this bit prompts the user to read the RHIR register for details. Transmit FIFO Half Empty. Set when the transmit 64 byte FIFO empties beyond the half-way point. The setting of this bit prompts the user to read the THIR register for details. Transmit FIFO Not Full. Set when the transmit 64 byte FIFO has at least 1 byte available. The setting of this bit prompts the user to read the THIR register for details. Transmit Message End. Set when the transmit HDLC controller has finished sending a message. The setting of this bit prompts the user to read the THIR register for details. Note: The RPE, RPS, and TMEND bits are latched and are cleared when read. 74 of 117 DS21FT44/DS21FF44 HIMR: HDLC INTERRUPT MASK REGISTER (Address = B2 Hex) (MSB) — RPE RPS SYMBOL — POSITION HIMR.7 RPE HIMR.6 RPS HIMR.5 RHALF HIMR.4 RNE HIMR.3 THALF HIMR.2 TNF HIMR.1 TMEND HIMR.0 RHALF RNE THALF TNF NAME AND DESCRIPTION Not Assigned. Should be set to zero. Receive Packet End 0 = interrupt masked 1 = interrupt enabled Receive Packet Start 0 = interrupt masked 1 = interrupt enabled Receive FIFO Half Full 0 = interrupt masked 1 = interrupt enabled Receive FIFO Not Empty 0 = interrupt masked 1 = interrupt enabled Transmit FIFO Half Empty 0 = interrupt masked 1 = interrupt enabled Transmit FIFO Not Full 0 = interrupt masked 1 = interrupt enabled Transmit Message End 0 = interrupt masked 1 = interrupt enabled 75 of 117 (LSB) TMEND DS21FT44/DS21FF44 RHIR: RECEIVE HDLC INFORMATION REGISTER (Address = B3 Hex) (MSB) RABT RCRCE ROVR SYMBOL POSITION RABT RHIR.7 RCRCE RHIR.6 ROVR RHIR.5 RVM RHIR.4 REMPTY RHIR.3 POK RHIR.2 CBYTE RHIR.1 OBYTE RHIR.0 RVM REMPTY POK CBYTE (LSB) OBYTE NAME AND DESCRIPTION Abort Sequence Detected. Set whenever the HDLC controller sees seven or more ones in a row. CRC Error. Set when the CRC checksum is in error. Overrun. Set when the HDLC controller has attempted to write a byte into an already full receive FIFO. Valid Message. Set when the HDLC controller has detected and checked a complete HDLC packet. Empty. A real-time bit that is set high when the receive FIFO is empty. Packet OK. Set when the byte available for reading in the receive FIFO at RHFR is the last byte of a valid message (and hence no abort was seen, no overrun occurred, and the CRC was correct). Closing Byte. Set when the byte available for reading in the receive FIFO at RFDL is the last byte of a message (whether the message was valid or not). Opening Byte. Set when the byte available for reading in the receive FIFO at RHFR is the first byte of a message. Note: The RABT, RCRCE, ROVR, and RVM bits are latched and are cleared when read. RHFR: RECEIVE HDLC FIFO REGISTER (Address = B4 Hex) (MSB) HDLC7 HDLC6 HDLC5 HDLC4 HDLC3 HDLC2 HDLC1 (LSB) HDLC0 SYMBOL POSITION NAME AND DESCRIPTION HDLC7 RHFR.7 HDLC Data Bit 7. MSB of a HDLC packet data byte. HDLC6 HDLC5 HDLC4 RHFR.6 RHFR.5 RHFR.4 HDLC Data Bit 6 HDLC Data Bit 5 HDLC Data Bit 4 HDLC3 HDLC2 HDLC1 RHFR.3 RHFR.2 RHFR.1 HDLC Data Bit 3 HDLC Data Bit 2 HDLC Data Bit 1 HDLC0 RHFR.0 HDLC Data Bit 0. LSB of a HDLC packet data byte. 76 of 117 DS21FT44/DS21FF44 THIR: TRANSMIT HDLC INFORMATION REGISTER (Address = B6 Hex) (MSB) — — — — — EMPTY (LSB) TUDR TFULL SYMBOL POSITION NAME AND DESCRIPTION — — — THIR.7 THIR.6 THIR.5 Not Assigned. Could be any value when read. — — THIR.4 THIR.3 Not Assigned. Could be any value when read. TEMPTY THIR.2 TFULL THIR.1 TUDR THIR.0 Not Assigned. Could be any value when read. Not Assigned. Could be any value when read. Not Assigned. Could be any value when read. Transmit FIFO Empty. A real-time bit that is set high when the FIFO is empty. Transmit FIFO Full. A real-time bit that is set high when the FIFO is full. Transmit FIFO Underrun. Set when the transmit FIFO unwantedly empties out and an abort is automatically sent. Note: The TUDR bit is latched and are cleared when read. THFR: TRANSMIT HDLC FIFO REGISTER (Address = B7 Hex) (MSB) HDLC7 HDLC6 HDLC5 HDLC4 HDLC3 HDLC2 HDLC1 (LSB) HDLC0 SYMBOL HDLC7 HDLC6 POSITION THFR.7 THFR.6 NAME AND DESCRIPTION HDLC Data Bit 7. MSB of a HDLC packet data byte. HDLC Data Bit 6 HDLC5 THFR.5 HDLC Data Bit 5 HDLC4 HDLC3 HDLC2 THFR.4 THFR.3 THFR.2 HDLC Data Bit 4 HDLC Data Bit 3 HDLC Data Bit 2 HDLC1 HDLC0 THFR.1 THFR.0 HDLC Data Bit 1 HDLC Data Bit 0. LSB of a HDLC packet data byte. 77 of 117 DS21FT44/DS21FF44 RDC1: RECEIVE HDLC DS0 CONTROL REGISTER 1 (Address = B8 Hex) (MSB) RHS SYMBOL RSaDS RDS0M POSITION RD4 RD3 RD2 RD1 (LSB) RD0 NAME AND DESCRIPTION RHS RDC1.7 RSaDS RDC1.6 RDS0M RDC1.5 RD4 RDC1.4 Receive HDLC Source 0 = Sa bits defined by RCR2.3 to RCR2.7 1 = Sa bits or DS0 channels defined by RDC1 (see bits defined below) Receive Sa Bit/DS0 Select 0 = route Sa bits to the HDLC controller. RD0 to RD4 defines which Sa bits are to be routed. RD4 corresponds to Sa4, RD3 to Sa5, RD2 to Sa6, RD1 to Sa7, and RD0 to Sa8. 1 = route DS0 channels into the HDLC controller. RDC1.5 is used to determine how the DS0 channels are selected. DS0 Selection Mode 0 = utilize the RD0 to RD4 bits to select which single DS0 channel to use. 1 = utilize the RCHBLK control registers to select which DS0 channels to use. DS0 Channel Select Bit 4. MSB of the DS0 channel select. RD3 RD2 RDC1.3 RDC1.2 DS0 Channel Select Bit 3 DS0 Channel Select Bit 2 RD1 RD0 RDC1.1 RDC1.0 DS0 Channel Select Bit 1 DS0 Channel Select Bit 0. LSB of the DS0 channel select. 78 of 117 DS21FT44/DS21FF44 RDC2: RECEIVE HDLC DS0 CONTROL REGISTER 2 (Address = B9 Hex) (MSB) RDB8 RDB7 RDB6 SYMBOL POSITION RDB8 RDC2.7 RDB7 RDC2.6 RDB6 RDC2.5 RDB5 RDC2.4 RDB4 RDC2.3 RDB3 RDC2.2 RDB2 RDC2.1 RDB1 RDC2.0 RDB5 RDB4 RDB3 RDB2 (LSB) RDB1 NAME AND DESCRIPTION DS0 Bit 8 Suppress Enable. MSB of the DS0. Set to one to stop this bit from being used. DS0 Bit 7 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 6 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 5 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 4 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 3 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 2 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 1 Suppress Enable. LSB of the DS0. Set to one to stop this bit from being used. 79 of 117 DS21FT44/DS21FF44 TDC1: TRANSMIT HDLC DS0 CONTROL REGISTER 1 (Address = BA Hex) (MSB) THE SYMBOL TSaDS TDS0M POSITION TD4 TD3 TD2 TD1 (LSB) TD0 NAME AND DESCRIPTION THE TDC1.7 TSaDS TDC1.6 TDS0M TDC1.5 TD4 TDC1.4 Transmit HDLC Enable 0 = disable HDLC controller (no data inserted by HDLC controller into the transmit data stream) 1 = enable HDLC controller to allow insertion of HDLC data into either the Sa position or multiple DS0 channels as defined by TDC1 (see bit definitions below) Transmit Sa Bit/DS0 Select. This bit is ignored if TDC1.7 is set to zero. 0 = route Sa bits from the HDLC controller. TD0 to TD4 defines which Sa bits are to be routed. TD4 corresponds to Sa4, TD3 to Sa5, TD2 to Sa6, TD1 to Sa7, and TD0 to Sa8. 1 = route DS0 channels from the HDLC controller. TDC1.5 is used to determine how the DS0 channels are selected. DS0 Selection Mode 0 = use the TD0 to TD4 bits to select which single DS0 channel to use 1 = use the TCHBLK control registers to select which DS0 channels to use DS0 Channel Select Bit 4. MSB of the DS0 channel select. TD3 TDC1.3 DS0 Channel Select Bit 3 TD2 TD1 TD0 TDC1.2 TDC1.1 TDC1.0 DS0 Channel Select Bit 2 DS0 Channel Select Bit 1 DS0 Channel Select Bit 0. LSB of the DS0 channel select. 80 of 117 DS21FT44/DS21FF44 TDC2: TRANSMIT HDLC DS0 CONTROL REGISTER 2 (Address = BB Hex) (MSB) TDB8 TDB7 TDB6 SYMBOL POSITION TDB8 TDC2.7 TDB7 TDC2.6 TDB6 TDC2.5 TDB5 TDC2.4 TDB4 TDC2.3 TDB3 TDC2.2 TDB2 TDC2.1 TDB1 TDC2.0 20. TDB5 TDB4 TDB3 TDB2 (LSB) TDB1 NAME AND DESCRIPTION DS0 Bit 8 Suppress Enable. MSB of the DS0. Set to one to stop this bit from being used. DS0 Bit 7 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 6 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 5 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 4 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 3 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 2 Suppress Enable. Set to one to stop this bit from being used. DS0 Bit 1 Suppress Enable. LSB of the DS0. Set to one to stop this bit from being used. INTERLEAVED PCM BUS OPERATION In many architectures, the outputs of individual framers are combined into higher speed serial buses to simplify transport across the system. The DS21Q44 can be configured to allow each framer’s data and signaling busses to be multiplexed into higher speed data and signaling busses eliminating external hardware saving board space and cost. The interleaved PCM bus option supports two bus speeds and interleave modes. The 4.096MHz bus speed allows two framers to share a common bus. The 8.192MHz bus speed allows all four of the DS21Q44’s framers to share a common bus. Framers can interleave their data either on byte or frame boundaries. Framers that share a common bus must be configured through software and require several device pins to be connected together externally (Figures 20-1 and 20-2). Each framer’s elastic stores must be enabled and configured for 2.048MHz operation. The signal RSYNC must be configured as an input on each framer. For all bus configurations, one framer will be configured as the master device and the remaining framers on the shared bus will be configured as slave devices. Refer to the IBO register description below for more detail. In the 4.096MHz bus configuration there is one master and one slave per bus. Figure 20-1 shows the DS21Q44 configured to support two 4.096 MHz buses. Bus 1 consists of framers 0 and 1. Bus 2 consists of framers 2 and 3. Framers 0 and 2 are programmed as master devices. Framers 1 and 3 are programmed as slave devices. In the 8.192 MHz bus configuration there is one master and three slaves. Figure 20-2 shows the DS21Q44 configured to support an 8.192MHz bus. Framer 0 is programmed as the master device. Framers 1, 2, and 3 are programmed as slave devices. Consult timing diagrams in section 22 for additional information. When using the frame interleave mode, all framers that share an interleaved bus must have receive signals (RPOS and RNEG) that are synchronous with each other. The received signals must originate from the same clock reference. This restriction does not apply in the byte interleave mode. 81 of 117 DS21FT44/DS21FF44 IBO: INTERLEAVE BUS OPERATION REGISTER (Address = B5 Hex) (MSB) — —– —– —– IBOEN INTSEL MSEL0 SYMBOL POSITION NAME AND DESCRIPTION — IBO.7 Not Assigned. Should be set to 0. — IBO.6 Not Assigned. Should be set to 0. — IBO.5 Not Assigned. Should be set to 0. — IBO.4 IBOEN IBO.3 Not Assigned. Should be set to 0. Interleave Bus Operation Enable 0 = Interleave Bus Operation disabled 1 = Interleave Bus Operation enabled INTSEL IBO.2 Interleave Type Select 0 = Byte interleave 1 = Frame interleave MSEL0 IBO.1 Master Device Bus Select Bit 0 (Table 20-1) MSEL1 IBO.0 Master Device Bus Select Bit 1 (Table 20-1) Table 20-1. MASTER DEVICE BUS SELECT MSEL1 MSEL0 FUNCTION 0 0 Slave device 0 1 Master device with one slave device (4.096MHz bus rate) 1 0 Master device with three slave devices (8.192MHz bus rate) 1 1 Reserved 82 of 117 (LSB) MSEL1 DS21FT44/DS21FF44 Figure 20-1. 4.096MHz INTERLEAVED BUS EXTERNAL PIN CONNECTION EXAMPLE FRAMER 0 FRAMER 1 FRAMER 2 FRAMER 3 RSYSCLK0 RSYSCLK1 RSYSCLK2 RSYSCLK3 TSYSCLK0 TSYSCLK1 TSYSCLK2 TSYSCLK3 RSYNC0 RSYNC1 RSYNC2 RSYNC3 TSSYNC0 TSSYNC1 TSSYNC2 TSSYNC3 RSER0 RSER1 RSER2 RSER3 TSER0 TSER1 TSER2 TSER3 RSIG0 RSIG1 RSIG2 RSIG3 TSIG0 TSIG1 TSIG2 TSIG3 SYSCLK SYNC INPUT RSER TSER RSIG TSIG SYSCLK SYNC INPUT RSER TSER RSIG TSIG Bus 2 Bus 1 Figure 20-2. 8.192MHz INTERLEAVED BUS EXTERNAL PIN CONNECTION EXAMPLE FRAMER 0 FRAMER 1 FRAMER 2 FRAMER 3 RSYSCLK0 RSYSCLK1 RSYSCLK2 RSYSCLK3 TSYSCLK0 TSYSCLK1 TSYSCLK2 TSYSCLK3 RSYNC0 RSYNC1 RSYNC2 RSYNC3 TSSYNC0 TSSYNC1 TSSYNC2 TSSYNC3 RSER0 RSER1 RSER2 RSER3 TSER0 TSER1 TSER2 TSER3 RSIG0 RSIG1 RSIG2 RSIG3 TSIG0 TSIG1 TSIG2 TSIG3 SYSCLK SYNC INPUT RSER TSER RSIG TSIG 83 of 117 DS21FT44/DS21FF44 21. JTAG-BOUNDARY SCAN ARCHITECTURE AND TEST ACCESS PORT 21.1. DESCRIPTION The DS21Q44 IEEE 1149.1 design supports the standard instruction codes SAMPLE/PRELOAD, BYPASS, and EXTEST. Optional public instructions included with this design are HIGHZ, CLAMP, and IDCODE. See Figure 21-1 for a block diagram. The DS21Q44 contains the following items which meet the requirements set by the IEEE 1149.1 Standard Test Access Port and Boundary Scan Architecture. The DS21FT42 should be considered as 3 individual DS21Q42 devices. The DS21FF44 should be considered as 4 individual DS21Q44 devices. Test Access Port (TAP) TAP Controller Instruction Register Bypass Register Boundary Scan Register Device Identification Register The JTAG feature is only available when the DS21Q44 feature set is selected (FMS = 0). The JTAG feature is disabled when the DS21Q44 is configured for emulation of the DS21Q43 (FMS = 1). FMS is connected to ground for the DS21FF44/DS21FT44. Details on Boundary Scan Architecture and the Test Access Port can be found in IEEE 1149.1-1990, IEEE 1149.1a-1993, and IEEE 1149.1b-1994. The Test Access Port has the necessary interface pins; JTRST*, JTCLK, JTMS, JTDI, and JTDO. See the pin descriptions for details. Figure 21-1. BOUNDARY SCAN ARCHITECTURE Boundary Scan Register Identification Register Bypass Register MUX Instruction Register Select Test Access Port Controller +V 10K +V 10K JTDI Output Enable +V 10K JTMS JTCLK JTRST 84 of 117 JTDO DS21FT44/DS21FF44 21.2. TAP CONTROLLER STATE MACHINE This section covers the details on the operation of the Test Access Port (TAP) Controller State Machine. Please see Figure 21.2 for details on each of the states described below. TAP Controller The TAP controller is a finite state machine that responds to the logic level at JTMS on the rising edge of JTCLK. Test-Logic-Reset Upon power-up of the DS21Q44, the TAP Controller will be in the Test-Logic-Reset state. The Instruction register will contain the IDCODE instruction. All system logic of the DS21Q44 will operate normally. Run-Test-Idle The Run-Test-Idle is used between scan operations or during specific tests. The Instruction register and Test registers will remain idle. Select-DR-Scan All test registers retain their previous state. With JTMS low, a rising edge of JTCLK moves the controller into the Capture-DR state and will initiate a scan sequence. JTMS HIGH during a rising edge on JTCLK moves the controller to the Select-IR Capture-DR Data may be parallel-loaded into the Test Data registers selected by the current instruction. If the instruction does not call for a parallel load or the selected register does not allow parallel loads, the Test register will remain at its current value. On the rising edge of JTCLK, the controller will go to the ShiftDR state if JTMS is low or it will go to the Exit1-DR state if JTMS is high. Shift-DR The Test Data register selected by the current instruction will be connected between JTDI and JTDO and will shift data one stage towards its serial output on each rising edge of JTCLK. If a Test Register selected by the current instruction is not placed in the serial path, it will maintain its previous state. Exit1-DR While in this state, a rising edge on JTCLK with JTMS high will put the controller in the Update-DR state, and terminate the scanning process. A rising edge on JTCLK with JTMS low will put the controller in the Pause-DR state. Pause-DR Shifting of the test registers is halted while in this state. All Test registers selected by the current instruction will retain their previous state. The controller will remain in this state while JTMS is low. A rising edge on JTCLK with JTMS high will put the controller in the Exit2-DR state. Exit2-DR While in this state, a rising edge on JTCLK with JTMS high will put the controller in the Update-DR state and terminate the scanning process. A rising edge on JTCLK with JTMS low will enter the ShiftDR state. 85 of 117 DS21FT44/DS21FF44 Update-DR A falling edge on JTCLK while in the Update-DR state will latch the data from the shift register path of the Test registers into the data output latches. This prevents changes at the parallel output due to changes in the shift register. A rising edge on JTCLK with JTMS low, will put the controller in the Run-Test-Idle state. With JTMS high, the controller will enter the Select-DR-Scan state. Select-IR-Scan All test registers retain their previous state. The instruction register will remain unchanged during this state. With JTMS low, a rising edge of JTCLK moves the controller into the Capture-IR state and will initiate a scan sequence for the Instruction register. JTMS high during a rising edge on JTCLK puts the controller back into the Test-Logic-Reset state. Capture-IR The Capture-IR state is used to load the shift register in the instruction register with a fixed value. This value is loaded on the rising edge of JTCLK. If JTMS is high on the rising edge of JTCLK, the controller will enter the Exit1-IR state. If JTMS is low on the rising edge of JTCLK, the controller will enter the Shift-IR state. Shift-IR In this state, the shift register in the instruction register is connected between JTDI and JTDO and shifts data one stage for every rising edge of JTCLK towards the serial output. The parallel registers, as well as all Test registers remain at their previous states. A rising edge on JTCLK with JTMS high will move the controller to the Exit1-IR state. A rising edge on JTCLK with JTMS low will keep the controller in the Shift-IR state while moving data one stage thorough the instruction shift register. Exit1-IR A rising edge on JTCLK with JTMS low will put the controller in the Pause-IR state. If JTMS is high on the rising edge of JTCLK, the controller will enter the Update-IR state and terminate the scanning process. Pause-IR Shifting of the instruction shift register is halted temporarily. With JTMS high, a rising edge on JTCLK will put the controller in the Exit2-IR state. The controller will remain in the Pause-IR state if JTMS is low during a rising edge on JTCLK. Exit2-IR A rising edge on JTCLK with JTMS low will put the controller in the Update-IR state. The controller will loop back to Shift-IR if JTMS is high during a rising edge of JTCLK in this state. Update-IR The instruction code shifted into the instruction shift register is latched into the parallel output on the falling edge of JTCLK as the controller enters this state. Once latched, this instruction becomes the current instruction. A rising edge on JTCLK with JTMS low, will put the controller in the Run-Test-Idle state. With JTMS high, the controller will enter the Select-DR-Scan state. 86 of 117 DS21FT44/DS21FF44 Figure 21-2. TAP CONTROLLER STATE MACHINE 1 0 Test Logic Reset 0 Run Test/ Idle 1 Select DR-Scan 0 1 1 1 Capture DR Capture IR 0 Shift DR 0 Shift IR 0 1 Exit DR 1 Exit2 DR 0 Pause IR 0 0 1 0 Exit2 IR 1 1 Update IR Update DR 1 1 Exit IR 1 0 0 1 0 Pause DR 1 Select IR-Scan 0 0 1 0 21.3. INSTRUCTION REGISTER AND INSTRUCTIONS The instruction register contains a shift register as well as a latched parallel output and is 3 bits in length. When the TAP controller enters the Shift-IR state, the instruction shift register will be connected between JTDI and JTDO. While in the Shift-IR state, a rising edge on JTCLK with JTMS low will shift the data one stage towards the serial output at JTDO. A rising edge on JTCLK in the Exit1-IR state or the Exit2IR state with JTMS high will move the controller to the Update-IR state The falling edge of that same JTCLK will latch the data in the instruction shift register to the instruction parallel output. Instructions supported by the DS21Q44 with their respective operational binary codes are shown in Table 21-1. Table 21-1. INSTRUCTION CODES FOR THE DS21Q44 IEEE 1149.1 ARCHITECTURE INSTRUCTION SAMPLE/PRELOAD BYPASS EXTEST CLAMP HIGHZ IDCODE SELECTED REGISTER Boundary Scan Bypass Boundary Scan Boundary Scan Boundary Scan Device Identification 87 of 117 INSTRUCTION CODE 010 111 000 011 100 001 DS21FT44/DS21FF44 SAMPLE/PRELOAD A mandatory instruction for the IEEE 1149.1 specification. This instruction supports two functions. The digital I/Os of the DS21Q44 can be sampled at the boundary scan register without interfering with the normal operation of the device by using the Capture-DR state. SAMPLE/PRELOAD also allows the DS21Q44 to shift data into the boundary scan register by JTDI using the Shift-DR state. EXTEST EXTEST allows testing of all interconnections to the DS21Q44. When the EXTEST instruction is latched in the instruction register, the following actions occur. Once enabled by the Update-IR state, the parallel outputs of all digital output pins will be driven. The boundary scan register will be connected between JTDI and JTDO. The Capture-DR will sample all digital inputs into the boundary scan register. BYPASS When the BYPASS instruction is latched into the parallel instruction register, JTDI connects to JTDO through the 1 bit bypass test register. This allows data to pass from JTDI to JTDO not affecting the device’s normal operation. IDCODE When the IDCODE instruction is latched into the parallel instruction register, the Identification Test register is selected. The device identification code will be loaded into the Identification register on the rising edge of JTCLK following entry into the Capture-DR state. Shift-DR can be used to shift the identification code out serially by JTDO. During Test-Logic-Reset, the identification code is forced into the instruction register’s parallel output. The ID code will always have a ‘1’ in the LSB position. The next 11 bits identify the manufacturer’s JEDEC number and number of continuation bytes followed by 16 bits for the device and 4 bits for the version. See Table 21-2. Table 21-3 lists the device ID codes for the DS21Q42 and DS21Q44 devices. Table 21-2. ID CODE STRUCTURE MSB CONTENTS LENGTH Version (Contact Factory) 4 bits Device ID (See Table 21-3) 16 bits JEDEC “00010100001” 11 bits LSB “1” 1 bit Table 21-3. DEVICE ID CODES DEVICE DS21Q42 DS21Q44 16-BIT NUMBER 0000h 0001h HIGH-Z All digital outputs of the DS21Q44 will be placed in a high impedance state. The BYPASS register will be connected between JTDI and JTDO. CLAMP All digital outputs of the DS21Q44 will output data from the boundary scan parallel output while connecting the bypass register between JTDI and JTDO. The outputs will not change during the CLAMP instruction. 88 of 117 DS21FT44/DS21FF44 21.4. TEST REGISTERS IEEE 1149.1 requires a minimum of two test registers; the bypass register and the boundary scan register. An optional test register has been included with the DS21Q44 design. This test register is the identification register and is used in conjunction with the IDCODE instruction and the Test-Logic-Reset state of the TAP controller. Boundary Scan Register This register contains both a shift register path and a latched parallel output for all control cells and digital I/O cells and is 126 bits in length. able 21-3 shows all of the cell bit locations and definitions. Bypass Register This is a single 1-bit shift register used in conjunction with the BYPASS, CLAMP, and HIGH-Z instructions, which provides a short path between JTDI and JTDO. Identification Register The identification register contains a 32-bit shift register and a 32 bit latched parallel output. This register is selected during the IDCODE instruction and when the TAP controller is in the Test-Logic-Reset state. 89 of 117 DS21FT44/DS21FF44 Table 21-4. BOUNDARY SCAN REGISTER DESCRIPTION MCM PIN (DIE1) B7 G20 H20 G19 H19 G18 H18 G17 H17 W15 MCM PIN (DIE2) MCM PIN (DIE3) MCM PIN (DIE4) G20 H20 G19 H19 G18 H18 G17 H17 W15 G20 H20 G19 H19 G18 H18 G17 H17 W15 G20 H20 G19 H19 G18 H18 G17 H17 W15 SCAN REGISTER BIT 102 60 59 58 57 56 55 54 37 22 DS21Q42 DIE SYMBOL TYPE 8MCLK A0 A1 A2 A3 A4 A5 A6/ALE (AS) A7 BTS O I I I I I I I I I — 94 BUS.cntl — B6 T8 L20 M20 L19 M19 L18 M18 L17 M17 Y14 W14 G16 V14 E10 Y4 L20 M20 L19 M19 L18 M18 L17 M17 Y14 W14 G16 V14 E10 Y15 L20 M20 L19 M19 L18 M18 L17 M17 Y14 W14 G16 V14 E10 H16 K17 P17 C2 G3 E6 A8 A2 K1 D10 B9 E18 B2 H2 D9 A9 H16 K17 P17 N1 Y1 U6 N5 M3 V1 W6 J3 E18 M2 V3 V7 P3 T17 H16 K17 P17 Y8 W12 V17 U17 T9 W10 Y18 N17 E18 U9 W11 W17 T20 100 23 93 92 91 90 89 88 87 86 25 24 53 — — — — — — 19 72 39 5 107 76 43 9 111 21 75 42 8 110 CLKSI CS* D0 or AD0 D1 or AD1 D2 or AD2 D3 or AD3 D4 or AD4 D5 or AD5 D6 or AD6 D7 or AD7 FS0 FS1 INT* JTCLK JTDI JTDOF JTDOT JTMS JTRST* MUX RCHBLK0 RCHBLK1 RCHBLK2 RCHBLK3 RCLK0 RCLK1 RCLK2 RCLK3 RD*/(DS*) RNEG0 RNEG1 RNEG2 RNEG3 I I I/O I/O I/O I/O I/O I/O I/O I/O I I O I I O O I I I O O O O I I I I I I I I I E19 L20 M20 L19 M19 L18 M18 L17 M17 Y14 W14 G16 V14 E10 A19 H16 K17 P17 D16 K20 B18 B16 D14 P20 C18 C12 E18 E14 N20 C20 B13 90 of 117 CONTROL BIT DESCRIPTION 0 = D0–D7 or AD0– AD7 are inputs 1 = D0–D7 or AD0– AD7 are outputs DS21FT44/DS21FF44 MCM PIN (DIE1) A1 H1 H4 C9 C1 H3 C6 C8 D3 G2 D4 D8 B1 MCM PIN (DIE2) M1 W2 V5 P4 P1 W4 T7 N4 N2 V4 V6 K5 N3 MCM PIN (DIE3) T10 V11 Y19 R19 U11 Y12 V16 T16 U10 Y11 W19 U20 T11 MCM PIN (DIE4) D15 J18 A20 A14 E16 F20 C16 A12 E15 K19 C17 A15 J17 — G1 Y2 V13 J19 — D6 U5 V15 B17 — A7 J4 P18 B12 — B5 E2 E5 B8 D1 H5 C5 A5 A13 C3 J1 F5 A10 B3 J2 J5 B10 M4 T2 Y5 W3 R1 Y3 T6 K2 A13 L1 V2 V8 P5 L2 W1 W7 R3 T4 Y9 U12 R17 U13 Y13 T18 P16 A13 U14 V12 W18 T19 T14 Y10 V18 V20 E13 N18 E20 C14 K16 F19 E17 C11 A13 D11 K18 C19 B15 E12 N19 B19 B14 SCAN REGISTER BIT 74 41 7 109 68 33 1 103 73 40 6 108 69 DS21Q42 DIE SYMBOL TYPE RPOS0 RPOS1 RPOS2 RPOS3 RSER0 RSER1 RSER2 RSER3 RSIG0 RSIG1 RSIG2 RSIG3 RSYNC0 I I I I O O O O O O O O I/O 70 RSYNC0.cntl — 34 RSYNC1 I/O 35 RSYNC1.cntl — 2 RSYNC2 I/O 3 RSYNC2.cntl — 104 RSYNC3 I/O 105 RSYNC3.cntl — 71 38 4 106 65 31 125 99 26 79 46 12 114 80 47 13 115 *RSYSCLK0 *RSYSCLK1 *RSYSCLK2 *RSYSCLK3 TCLK0 TCLK1 TCLK2 TCLK3 TEST TNEG0 TNEG1 TNEG2 TNEG3 TPOS0 TPOS1 TPOS2 TPOS3 I I I I I I I I I O O O O O O O O 91 of 117 CONTROL BIT DESCRIPTION 0 = RSYNC0 an input 1 = RSYNC0 an output 0 = RSYNC1 an input 1 = RSYNC1 an output 0 = RSYNC2 an input 1 = RSYNC2 an output 0 = RSYNC3 an input 1 = RSYNC3 an output DS21FT44/DS21FF44 MCM PIN (DIE1) B4 E1 F3 D7 C4 F1 G4 C10 A3 F2 G5 E8 E3 MCM PIN (DIE2) L5 T1 Y6 T3 L3 U2 V9 R5 L4 U1 Y7 R4 R2 MCM PIN (DIE3) M16 W9 W16 W20 U15 V10 U18 R18 T15 W8 Y17 U19 T13 MCM PIN (DIE4) D13 F17 D18 A18 E11 P19 B20 A16 C13 R20 D20 A17 J16 — F4 W5 W13 F18 — E7 T5 U16 C15 — A4 M5 N16 D12 — B5 E2 E5 B8 C7 E4 D2 E9 A6 D5 Y16 M4 T2 Y5 W3 K3 U7 P2 U3 K4 U8 Y16 T4 Y9 U12 R17 V19 T12 L16 U4 R16 Y20 Y16 E13 N18 E20 C14 D17 F16 B11 J20 A11 D19 Y16 SCAN REGISTER BIT 84 51 17 119 82 49 15 117 83 50 16 118 62 DS21Q42 DIE SYMBOL TYPE TSER0 TSER1 TSER2 TSER3 TSIG0 TSIG1 TSIG2 TSIG3 TSSYNC0 TSSYNC1 TSSYNC2 TSSYNC3 TSYNC0 I I I I I I I I I I I I I/O 63 TSYNC0.cntl — 28 TSYNC1 I/O 29 TSYNC1.cntl — 122 TSYNC2 I/O 123 TSYNC2.cntl — 96 TSYNC3 I/O 97 TSYNC3.cntl — 85 52 18 120 — — — — — — 20 *TSYSCLK0 *TSYSCLK1 *TSYSCLK2 *TSYSCLK3 VDD VDD VDD VSS VSS VSS WR*/(R/W*) I I I I — — — — — — I *RSYSCLKn and TSYSCLKn are connected together. 92 of 117 CONTROL BIT DESCRIPTION 0 = TSYNC0 an input 1 = TSYNC0 an output 0 = TSYNC1 an input 1 = TSYNC1 an output 0 = TSYNC2 an input 1 = TSYNC2 an output 0 = TSYNC3 an input 1 = TSYNC3 an output DS21FT44/DS21FF44 22. TIMING DIAGRAMS Figure 22-1. RECEIVE SIDE TIMING 14 FRAME# RSYNC1/ RFSYNC 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 RSYNC 2 RLCLK 3 4 RLINK Notes: 1. RSYNC in the frame mode (RCR1.6 = 0) 2. RSYNC in the multiframe mode (RCR1.6 = 1) 3. RLCLK is programmed to output just the Sa4 bit 4. RLINK will always output all five Sa bits as well as the rest of the receive data stream 5. This diagram assumes the CAS MF begins with the FAS word Figure 22-2. RECEIVE SIDE BOUNDARY TIMING (With Elastic Store Disabled) RCLK CHANNEL 1 RPOS, RNEG 1 LSB Si CHANNEL 2 LSB CHANNEL 2 1 A Sa4 Sa5 Sa6 Sa7 Sa8 MSB CHANNEL 32 CHANNEL 1 RSER MSB LSB Si 1 A Sa4 Sa5 Sa6 Sa7 Sa8 MSB RSYNC / RFSYNC CHANNEL 32 B A RSIG CHANNEL 1 C Sa5 D CHANNEL 2 Note 5 RCHCLK RCHBLK 2 RLINK Sa4 Sa5 Sa6 Sa7 Sa8 RLCLK3 Notes: 1. There is a 6 RCLK delay from RPOS, RNEG to RSER 2. RCHBLK is programmed to block channel 2 3. RLINK is programmed to output the Sa4 bit 4. Shown is a non-align frame boundary 5. RSIG normally contains the CAS multiframe alignment nibble (0000) in Channel 1 93 of 117 DS21FT44/DS21FF44 Figure 22-3. RECEIVE SIDE 1.544MHz BOUNDARY TIMING (With Elastic Store Enabled) RSYSCLK RSER1 CHANNEL 23/31 CHANNEL 24/32 CHANNEL 1/2 LSB MSB LSB F MSB RSYNC2/ RMSYNC RSYNC3 RCHCLK RCHBLK4 Notes: 1. Data from the E1 channels 1, 5, 9, 13, 17, 21, 25, and 29 is dropped (channel 2 from the E1 link is mapped to channel 1 of the T1 link, etc.) and the F-bit position is added (forced to one) 2. RSYNC is in the output mode (RCR1.5 = 0) 3. RSYNC is in the input mode (RCR1.5 = 1) 4. RCHBLK is programmed to block channel 24 Figure 22-4. RECEIVE SIDE 2.048MHz BOUNDARY TIMING (With Elastic Store Enabled) RSYSCLK CHANNEL 31 CHANNEL 32 RSER LSB CHANNEL 1 LSB MSB MSB 1 RSYNC / RMSYNC RSYNC2 CHANNEL 31 RSIG A B CHANNEL 32 C D A B CHANNEL 1 C D Note 4 RCHCLK RCHBLK 3 Notes: 1. RSYNC is in the output mode (RCR1.5 = 0) 2. RSYNC is in the input mode (RCR1.5 = 1) 3. RCHBLK is programmed to block channel 1 4. RSIG normally contains the CAS multiframe alignment nibble (0000) in Channel 1 94 of 117 DS21FT44/DS21FF44 Figure 22-5. RECEIVE SIDE, INTERLEAVED BUS OPERATION BYTE MODE TIMING RSYNC 1 RSER FR1 CH32 FR0 CH1 FR1 CH1 FR0 CH2 FR1 CH2 FR1 CH32 FR0 CH1 FR1 CH1 FR0 CH2 FR1 CH2 1 RSIG 2 RSER FR2 CH32 FR3 CH32 FR0 CH1 FR1 CH1 FR2 CH1 FR3 CH1 FR0 CH2 FR1 CH2 FR2 CH2 FR3 CH2 FR2 CH32 FR3 CH32 FR0 CH1 FR1 CH1 FR2 CH1 FR3 CH1 FR0 CH2 FR1 CH2 FR2 CH2 FR3 CH2 2 RSIG BIT DETAIL SYSCLK 3 RSYNC FRAMER 3, CHANNEL 32 RSER FRAMER 3, CHANNEL 32 RSIG A B C/A FRAMER 1, CHANNEL 1 FRAMER 0, CHANNEL 1 LSB MSB LSB MSB FRAMER 1, CHANNEL 1 FRAMER 0, CHANNEL 1 D/B A B C/D LSB D/B Notes: 1. 4.096 MHz bus configuration. 2. 8.192 MHz bus configuration. 3. RSYNC is in the input mode (RCR1.5 = 1). 95 of 117 A B C/D D/B DS21FT44/DS21FF44 Figure 22-6. RECEIVE SIDE, INTERLEAVED BUS OPERATION FRAME MODE TIMING RSYNC 1 RSER 1 RSIG 2 RSER 2 RSIG FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 BIT DETAIL SYSCLK 3 RSYNC RSER FRAMER 3, CHANNEL 32 LSB MSB FRAMER 3, CHANNEL 32 RSIG A B C/A FRAMER 0, CHANNEL 2 FRAMER 0, CHANNEL 1 LSB MSB FRAMER 0, CHANNEL 2 FRAMER 0, CHANNEL 1 A D/B B C/D LSB D/B A B C/D 2 3 4 D/B Notes: 1. 4.096 MHz bus configuration. 2. 8.192 MHz bus configuration. 3. RSYNC is in the input mode (RCR1.5 = 1). Figure 22-7. TRANSMIT SIDE TIMING FRAME# 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 TSYNC 2 TSYNC TLCLK TLINK 3 3 Notes: 1. TSYNC in the frame mode (TCR1.1 = 0) 2. TSYNC in the multiframe mode (TCR1.1 = 1) 3. TLINK is programmed to source just the Sa4 bit 4. This diagram assumes both the CAS MF and the CRC4 begin with the align frame 96 of 117 1 5 6 DS21FT44/DS21FF44 Figure 22-8. TRANSMIT SIDE BOUNDARY TIMING (With Elastic Store Disabled) TCLK CHANNEL 1 TSER LSB Si 1 A Sa4 Sa5 CHANNEL 2 Sa6 Sa7 Sa8 CHANNEL 32 TPOS, TNEG1 MSB MSB LSB MSB CHANNEL 1 LSB Si 1 A Sa4 Sa5 Sa6 Sa7 Sa8 MSB 2 TSYNC TSYNC3 CHANNEL 1 TSIG B C CHANNEL 2 A D B C D Note 6 TCHCLK TCHBLK TLCLK TLINK 4 5 5 Don't Care Don't Care Notes: 1. There is a 5 TCLK delay from TSER to TPOS and TNEG 2. TSYNC is in the input mode (TCR1.0 = 0) 3. TSYNC is in the output mode (TCR1.0 = 1) 4. TCHBLK is programmed to block channel 2 5. TLINK is programmed to source the Sa4 bits 6. The signaling data at TSIG during channel 1 is normally overwritten in the transmit formatter with the CAS multiframe alignment nibble (0000) 7. Shown is a non-align frame boundary Figure 22-9. TRANSMIT SIDE 1.544MHz BOUNDARY TIMING (With Elastic Store Enabled) TSYSCLK CHANNEL 23 TSER CHANNEL 24 CHANNEL 1 MSB LSB LSB MSB F-Bit TSSYNC TCHCLK 1 TCHBLK Notes: 1. TCHBLK is programmed to block channel 23 2. The F-bit position is ignored by the DS2154 97 of 117 DS21FT44/DS21FF44 Figure 22-10. TRANSMIT SIDE 2.048MHz BOUNDARY TIMING (With Elastic Store Enabled) TSYSCLK CHANNEL 31 CHANNEL 32 TSER CHANNEL 1 LSB LSB MSB MSB TSSYNC CHANNEL 31 TSIG A B CHANNEL 32 C A D B CHANNEL 1 C D A TCHCLK 1 TCHBLK Notes: 1. TCHBLK is programmed to block channel 31 Figure 22-11. G.802 TIMING TIMESLOT # 30 31 0 1 2 3 4 5 6 7 8 910 111213141516 17 18 19202122232425262728293031 0 1 2 3 4 RSYNC/TSYNC RCHCLK/TCHCLK RCHBLK/TCHBLK1 Notes: 1. RCHBLK or TCHBLK is programmed to pulse high during timeslots 1 to 15, 17 to 25, and during bit 1 of timeslot 26 detail RCLK / RSYSCLK TCLK / TSYSCLK Timeslot 25 RSER/TSER Timeslot 26 LSB RCHCLK/TCHCLK RCHBLK/TCHBLK 98 of 117 MSB DS21FT44/DS21FF44 Figure 22-12. TRANSMIT SIDE, INTERLEAVED BUS OPERATION BYTE MODE TIMING TSSYNC 1 TSER 1 TSIG 2 TSER FR1 CH32 FR0 CH1 FR1 CH1 FR0 CH2 FR1 CH2 FR1 CH32 FR0 CH1 FR1 CH1 FR0 CH2 FR1 CH2 FR2 CH32 FR3 CH32 FR0 CH1 FR1 CH1 FR2 CH1 FR3 CH1 FR0 CH2 FR1 CH2 FR2 CH2 FR3 CH2 FR2 CH32 FR3 CH32 FR0 CH1 FR1 CH1 FR2 CH1 FR3 CH1 FR0 CH2 FR1 CH2 FR2 CH2 FR3 CH2 2 TSIG BIT DETAIL SYSCLK TSSYNC FRAMER 3, CHANNEL 32 TSER FRAMER 3, CHANNEL 32 TSIG A B C/A D/B FRAMER 1, CHANNEL 1 FRAMER 0, CHANNEL 1 LSB MSB LSB MSB FRAMER 1, CHANNEL 1 FRAMER 0, CHANNEL 1 A B C/D LSB D/B Notes: 1. 4.096 MHz bus configuration. 2. 8.192 MHz bus configuration. 99 of 117 A B C/D D/B DS21FT44/DS21FF44 Figure 22-13. TRANSMIT SIDE INTERLEAVED BUS OPERATION FRAME MODE TIMING TSSYNC 1 TSER 1 TSIG 2 TSER FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 FR0 CH1-32 FR1 CH1-32 FR2 CH1-32 FR3 CH1-32 2 TSIG BIT DETAIL SYSCLK TSSYNC FRAMER 3, CHANNEL 32 TSER FRAMER 3, CHANNEL 32 TSIG A B C/A D/B FRAMER 0, CHANNEL 2 FRAMER 0, CHANNEL 1 LSB MSB LSB MSB FRAMER 0, CHANNEL 2 FRAMER 0, CHANNEL 1 A B C/D LSB D/B Notes: 1. 4.096 MHz bus configuration. 2. 8.192 MHz bus configuration. 100 of 117 A B C/D D/B DS21FT44/DS21FF44 Figure 22-14. DS21Q44 FRAMER SYNCHRONIZATION FLOWCHART Power Up RLOS = 1 FAS Search FASSA = 1 RLOS = 1 FAS Sync Criteria Met FASSA = 0 Resync if RCR1.0 = 0 Increment CRC4 Sync Counter; CRC4SA = 0 8ms Time Out CRC4 Multiframe Search (if enabled via CCR1.0) CRC4SA = 1 CRC4 Sync Criteria Met; CRC4SA = 0; Reset CRC4 Sync Counter Set FASRC (RIR.1) CRC4 Resync Criteria Met (RIR.2) CAS Resync Criteria Met; Set CASRC (RIR.0) FAS Resync Criteria Met Check for FAS Framing Error (depends on RCR1.2) Check for >=915 Out of 1000 CRC4 Word Errors If CRC4 is on (CCR1.0 = 1) Check for CAS MF Word Error If CAS is on (CCR1.3 = 0) 101 of 117 CAS Multiframe Search (if enabled via CCR1.3) CASSA = 1 Sync Declared RLOS = 0 CAS Sync Criteria Met CASSA = 0 DS21FT44/DS21FF44 Figure 22-15. DS21Q44 TRANSMIT DATA FLOW TSER & TDATA HDLC ENGINE TCBR1/2/3/4 TSIG 0 RSER (note #1) TLINK 1 Hardware Signaling Insertion CCR3.5 CCR3.2 TNAF.0-4 0 Sa Data Source MUX (TDC1) 1 0 1 DS0 Data Source MUX (TDC1/2) TAF TNAF.5-7 0 TAF/TNAF Bit MUX TC1 to TC32 1 0 1 Per-Channel Code Generation (TCC1/2/3/4) 0 1 Timeslot 0 Pass-Through (TCR1.6) 1 0 Si Bit Insertion Control (TCR1.3) Receive Side CRC4 Error Detector CRC4 Multiframe Alignment Word Generation (CCR.4) 1 0 E-Bit Generation (TCR2.1) 0 1 Sa Bit Insertion Control (TCR2.3 thru TCR2.7) TSiAF TSiNAF TIDR TRA Auto Remote Alarm Generation (CCR2.4) 0 TSa4 to TSa8 1 TIRFunction Select (CCR3.5) 0 1 Sa Bit Insertion Control Register (TSaCR) AIS Generation TS1 to TS16 0 1 Idle Code / Channel Insertion Control via TIR1/2/3/4 0 1 Transmit Signaling All Ones (TCR1.2) TCBR1/2/3/4 0 1 Signaling Bit Insertion Control CCR3.6 TCR1.5 Code Word Generation 0 1 CRC4 Enable (CCR1.4) KEY: = Register AIS Generation DS0 Monitor = Device Pin 0 1 Transmit Unframed All Ones (TCR1.4) or Auto AIS (CCR2.5) = Selector NOTES: 1. TCLK should be tied to RCLK and TSYNC should be tied to RFSYNC for data to be properly sourced from RSER. 2. Auto Remote Alarm if enabled will only overwrite bit 3 of timeslot 0 in the Not Align Frames if the alarm needs to be sent. 102 of 117 TPOS, TNEG DS21FT44/DS21FF44 23. OPERATING PARAMETERS ABSOLUTE MAXIMUM RATINGS* Voltage Range on Any Non-Supply Pin Relative to Ground Supply Voltage Range Operating Temperature Range for DS21Q44T Operating Temperature Range for DS21Q44TN Storage Temperature Range Soldering Temperature Range -1.0V to +5.5V -0.3V to +3.63V 0ºC to +70ºC -40ºC to +85ºC -55ºC to +125ºC See IPC/JEDEC J-STD-020A *This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time can affect reliability. RECOMMENDED DC OPERATING CONDITIONS PARAMETER Logic 1 Logic 0 Supply SYMBOL VIH VIL VDD MIN 2.2 -0.3 2.97 (TA = 0°C to +70°C for DS21FF44/DS21FT44 TA = -40°C to +85°C for DS21FF44N/DS21FT44N) TYP MAX UNITS NOTES 5.5 V +0.8 V 3.63 V CAPACITANCE PARAMETER Input Capacitance Output Capacitance SYMBOL CIN COUT MIN TYP 5 7 MAX (TA = +25°C) UNITS NOTES pF pF DC CHARACTERISTICS PARAMETER Supply Current at 3.3V (DS21FT44) Supply Current at 3.3V (DS21FF44) Input Leakage Output Leakage Output Current (2.4V) Output Current (0.4V) (VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44 VDD = 2.97 to 3.63V, TA = -40ºC to +85ºC for DS21FF44N/DS21FT44N) SYMBOL MIN TYP MAX UNITS NOTES IDD 225 mA 1 IDD 300 mA 1 µA µA mA mA 2 3 IIL ILO IOH IOL -1.0 +1.0 1.0 -1.0 +4.0 NOTES: 1) TCLK = RCLK = TSYSCLK = RSYSCLK = 2.048MHz; outputs open-circuited. 2) 0.0V < VIN < VDD 3) Applied to INT* when tri-stated. 103 of 117 DS21FT44/DS21FF44 AC CHARACTERISTICS—MULTIPLEXED PARALLEL PORT (MUX = 1) (VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44; VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FT44N) SYMBOL MIN TYP MAX UNITS NOTES tCYC 200 ns PARAMETER Cycle Time Pulse Width, DS low or PWEL RD* high Pulse Width, DS high or PWEH RD* low Input Rise/Fall times tR , t F R/W* Hold Time tRWH R/W* Setup time before tRWS DS high CS*, FSO or FS1 Setup time before DS, WR* or tCS RD* active CS*, FSO or FS1 Hold tCH time Read Data Hold time tDHR Write Data Hold time tDHW Muxed Address valid to tASL AS or ALE fall Muxed Address Hold tAHL time Delay time DS, WR* or tASD RD* to AS or ALE rise Pulse Width AS or ALE PWASH high Delay time, AS or ALE tASED to DS, WR* or RD* Output Data Delay time tDDR from DS or RD* Data Setup time tDSW See Figures 23-1 to 23-3 for details 100 ns 100 ns 20 10 ns ns 50 ns 20 ns 0 ns 10 10 50 ns ns 15 ns 10 ns 20 ns 30 ns 10 ns 20 80 50 ns ns 104 of 117 DS21FT44/DS21FF44 AC CHARACTERISTICS—NONMULTIPLEXED PARALLEL PORT (MUX = 0) (VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44; VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FTN44) SYMBOL MIN TYP MAX UNITS NOTES PARAMETER Setup Time for A0 to A7, FS0 or FS1 Valid to t1 CS* Active Setup Time for CS* Active to either RD*, t2 WR*, or DS* Active Delay Time from either RD* or DS* Active to t3 Data Valid Hold Time from either RD*, WR*, or DS* t4 Inactive to CS* Inactive Hold Time from CS* Inactive to Data Bus 3– t5 state Wait Time from either WR* or DS* Active to t6 Latch Data Data Setup Time to either WR* or DS* t7 Inactive Data Hold Time from either WR* or DS* t8 Inactive Address Hold from either WR* or DS* t9 inactive See Figures 23–4 to 23–7 for details. 0 ns 0 ns 75 0 ns ns 5 50 ns 75 ns 15 ns 10 ns 10 ns 105 of 117 DS21FT44/DS21FF44 AC CHARACTERISTICS—RECEIVE SIDE (VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44 VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FT44N) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES RCLK Period tCP 488 ns RCLK Pulse Width tCH 75 ns tCL RSYSCLK Period tSP 648 1 122 ns tSP 488 2 RSYSCLK Pulse Width tSH 50 ns tSL RSYNC Setup/Hold to tSU 20 tSH - 5 ns tHD RSYSCLK Falling RSYNC Pulse Width tPW 50 ns RPOS/RNEG Setup to tSU 20 ns RCLK Falling RPOS/RNEG Hold From tHD 20 ns RCLK Falling RSYSCLK/RCLKI Rise tR , tF 25 ns and Fall Times Delay RCLK to RSER, tD1 50 ns RSIG, RLINK Valid Delay RCLK to RCHCLK, RSYNC, RCHBLK, tD2 50 ns RFSYNC, RLCLK Delay RSYSCLK to tD3 50 ns RSER, RSIG Valid Delay RSYSCLK to RCHCLK, RCHBLK, tD4 50 ns RMSYNC, RSYNC See Figures 23-8 to 23-10 for details. NOTES: 1) RSYSCLK = 1.544MHz 2) RSYSCLK = 2.048MHz 106 of 117 DS21FT44/DS21FF44 AC CHARACTERISTICS—TRANSMIT SIDE (VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44 VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FT44N) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES TCLK Period tCP 488 ns TCLK Pulse Width tCH 75 ns tCL TCLKI Pulse Width tLH 75 ns tLL TSYSCLK Period tSP 648 1 122 ns tSP 448 2 TSYSCLK Pulse Width tSH 50 ns tSL TSYNC or TSSYNC tCH - 5 tSU Setup/Hold to TCLK or or 20 ns tHD TSYSCLK falling tSH - 5 TSYNC or TSSYNC Pulse tPW 50 ns Width TSER, TSIG, TLINK Setup to TCLK, tSU 20 ns TSYSCLK Falling TSER, TSIG, TLINK Hold from TCLK, TSYSCLK tHD 20 ns Falling TCLK or TSYSCLK Rise tR , tF 25 ns and Fall Times Delay TCLK to TPOS, tDD 50 ns TNEG Valid Delay TCLK to TCHBLK, TCHCLK, TSYNC, tD2 50 ns TLCLK Delay TSYSCLK to tD3 75 ns TCHCLK, TCHBLK See Figures 23–11 to 23–13 for details. NOTES: 1) TSYSCLK = 1.544MHz 2) TSYSCLK = 2.048MHz 107 of 117 DS21FT44/DS21FF44 Figure 23-1. INTEL BUS READ AC TIMING (BTS = 0 / MUX = 1) t CYC ALE PWASH t ASD WR* t ASD RD* PWEL t ASED PWEH t CH t CS CS* t ASL t DHR t DDR AD0-AD7 t AHL Figure 23-2. INTEL BUS WRITE TIMING (BTS = 0 / MUX = 1) t CYC ALE PWASH t ASD RD* WR* t ASD PWEL t ASED PWEH t CH t CS CS* t ASL t DHW AD0-AD7 t AHL t DSW 108 of 117 DS21FT44/DS21FF44 Figure 23-3. MOTOROLA BUS AC TIMING (BTS = 1 / MUX = 1) PWASH AS t ASD DS PWEH t ASED PWEL t CYC t RWS R/W* t DDR t ASL AD0-AD7 (read) t RWH t AHL t DHR t CH t CS CS* t DSW t ASL AD0-AD7 (write) t DHW t AHL Figure 23-4. INTEL BUS READ AC TIMING (BTS = 0 / MUX = 0) A0 to A7, FS0, FS1 Address Valid Data Valid D0 to D7 WR* 5ns min. / 20ns max. t1 CS* 0ns min. RD* t5 0ns min. t2 t3 t4 75ns max. 109 of 117 0ns min. DS21FT44/DS21FF44 Figure 23-5. INTEL BUS WRITE AC TIMING (BTS = 0 / MUX = 0) A0 to A7, FS0, FS1 Address Valid D0 to D7 t7 RD* t8 10ns 10ns min. min. t1 0ns min. CS* 0ns min. t2 t6 t4 0ns min. 75ns min. WR* Figure 23-6. MOTOROLA BUS READ AC TIMING (BTS = 1 / MUX = 0) A0 to A7, FS0, FS1 Address Valid Data Valid D0 to D7 5ns min. / 20ns max. R/W* t5 t1 0ns min. CS* 0ns min. t2 t3 t4 0ns min. 75ns max. DS* t2 0ns min. DS 1 t4 t3 0ns min. 75ns max. Notes: 1. The signal DS is active high when emulating the DS21Q43 (FMS = 1). 110 of 117 DS21FT44/DS21FF44 Figure 23-7. MOTOROLA BUS WRITE AC TIMING (BTS = 1 / MUX = 0) A0 to A7, FS0, FS1 Address Valid D0 to D7 R/W* 10ns min. t1 CS* 0ns min. t2 t4 t6 DS* t2 t6 0ns min. 1 t8 10ns min. 0ns min. 75ns min. DS t7 75ns min. Notes: 1. The signal DS is active high when emulating the DS21Q43 (FMS = 1) . 111 of 117 0ns min. DS21FT44/DS21FF44 Figure 23-8. RECEIVE SIDE AC TIMING RCLK t D1 MSB of Channel 1 RSER / RSIG t D2 RCHCLK t D2 RCHBLK t D2 RFSYNC / RMSYNC t D2 RSYNC1 t D2 2 RLCLK t D1 RLINK Sa4 to Sa8 Bit Position Notes: 1. RSYNC is in the output mode (RCR1.5 = 0). 2. RLCLK will only pulse high during Sa bit locations as defined in RCR2; no relationship between RLCLK and RSYNC or RFSYNC is implied. 112 of 117 DS21FT44/DS21FF44 Figure 23-9. RECEIVE SYSTEM SIDE AC TIMING tSL tF tR tSH RSYSCLK tSP tD3 MSB of Channel 1 RSER / RSIG tD4 RCHCLK tD4 RCHBLK t D4 RMSYNC t D4 1 RSYNC tHD tSU RSYNC2 Notes: 1. RSYNC is in the output mode (RCR1.5 = 0) 2. RSYNC is in the input mode (RCR1.5 = 1) 113 of 117 DS21FT44/DS21FF44 Figure 23-10. RECEIVE LINE INTERFACE AC TIMING t CL tF tR t CH RCLK t CP t SU RPOS, RNEG t HD Figure 23-11. TRANSMIT SIDE AC TIMING t CP t CL tF tR t CH TCLK t SU TSER / TSIG t HD t D2 TCHCLK t D2 TCHBLK t D2 TSYNC1 t SU t HD TSYNC2 5 TLCLK t D2 t HD TLINK t SU Notes: 1. TSYNC is in the output mode (TCR1.0 = 1). 2. TSYNC is in the input mode (TCR1.0 = 0). 3. TSER is sampled on the falling edge of TCLK when the transmit side elastic store is disabled. 4. TCHCLK and TCHBLK are synchronous with TCLK when the transmit side elastic store is disabled. 5. TLINK is only sampled during Sa bit locations as defined in TCR2; no relationship between TLCLK/TLINK and TSYNC is implied. 114 of 117 DS21FT44/DS21FF44 Figure 23-12. TRANSMIT SYSTEM SIDE AC TIMING tSP tSL tF tR tSH TSYSCLK tSU TSER t D3 tHD TCHCLK tD3 TCHBLK tSU tHD TSSYNC Notes: 1. TSER is only sampled on the falling edge of TSYSCLK when the transmit side elastic store is enabled. 2. TCHCLK and TCHBLK are synchronous with TSYSCLK when the transmit side elastic store is enabled. 115 of 117 DS21FT44/DS21FF44 Figure 23-13. TRANSMIT LINE INTERFACE SIDE AC TIMING t CP tR tF t CL TCLK TPOS, TNEG t DD 24. MCM PACKAGE DIMENSIONS 116 of 117 t CH DS21FT44/DS21FF44 POWER SUPPLY DECOUPLING In a typical PCB layout for the MCM, all of the VDD pins will connect to a common power plane and all the VSS lines will connect to a common ground plane. The recommended method for decoupling is shown below in both schematic and pictorial form. As shown in the pictorial, the capacitors should be symmetrically located about the device. Figure 24-1 uses standard capacitors, two .47 uf ceramics and two .01uf ceramics. Since VDD and VSS signals will typically pass vertically to the power and ground planes of a PCB, the decoupling caps must be placed as close to the DS21Fx4y as possible and routed vertically to power and ground planes. Figure 24-1. DECOUPLING SCHEME USING STANDARD TANTALUM CAPS VDD .47 .01 VDD DS21Fx4y .47 .01 .47 .01 117 of 117 .47 DS21Fx4y .01