72255LA15TF

CMOS SuperSync FIFO™ 8,192 x 18 16,384 x 18 IDT72255LA IDT72265LA LEAD FINISH (SnPb) ARE IN EOL PROCESS - LAST TIME BUY EXPIRES JUNE 15, 2018 FEATURES • • • • • • • • • • • • • • • • Choose among the following memory organizations: IDT72255LA — 8,192 x 18 IDT72265LA — 16,384 x 18 Pin-compatible with the IDT72275/72285 SuperSync FIFOs 10ns read/write cycle time (8ns access time) Fixed, low first word data latency time Auto power down minimizes standby power consumption Master Reset clears entire FIFO Partial Reset clears data, but retains programmable settings Retransmit operation with fixed, low first word data latency time Empty, Full and Half-Full flags signal FIFO status Programmable Almost-Empty and Almost-Full flags, each flag can default to one of two preselected offsets Program partial flags by either serial or parallel means Select IDT Standard timing (using EF and FF flags) or First Word Fall Through timing (using OR and IR flags) Output enable puts data outputs into high impedance state Easily expandable in depth and width Independent Read and Write clocks (permit reading and writing simultaneously) • • • Available in the 64-pin Thin Quad Flat Pack (TQFP) and the 64pin Slim Thin Quad Flat Pack (STQFP) High-performance submicron CMOS technology Industrial temperature range (–40°C to +85°C) is available Green parts available, see ordering information DESCRIPTION The IDT72255LA/72265LA are exceptionally deep, high speed, CMOS First-In-First-Out (FIFO) memories with clocked read and write controls. These FIFOs offer numerous improvements over previous SuperSync FIFOs, including the following: • The limitation of the frequency of one clock input with respect to the other has been removed. The Frequency Select pin (FS) has been removed, thus it is no longer necessary to select which of the two clock inputs, RCLK or WCLK, is running at the higher frequency. • The period required by the retransmit operation is now fixed and short. • The first word data latency period, from the time the first word is written to an empty FIFO to the time it can be read, is now fixed and short. (The variable clock cycle counting delay associated with the latency period found on previous SuperSync devices has been eliminated on this SuperSync family.) FUNCTIONAL BLOCK DIAGRAM WEN D0 -D17 WCLK INPUT REGISTER L D SEN OFFSET REGISTER FLAG LOGIC WRITE CONTROL LOGIC RAM ARRAY 8,192 x 18 16,384 x 18 WRITE POINTER F F /IR PAF EF /OR P AE HF FWFT/SI READ POINTER READ CONTROL LOGIC RT OUTPUT REGISTER MRS P RS RESET LOGIC RCLK REN OE Q0 -Q17 IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. SuperSync FIFO is a trademark of Integrated Device Technology, Inc COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES 4670 drw01 NOVEMBER 2017 1 © 2017 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. DSC-4670/5 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES DESCRIPTION (CONTINUED) The frequencies of both the RCLK and the WCLK signals may vary from 0 to fMAX with complete independence. There are no restrictions on the frequency of one clock input with respect to the other. There are two possible timing modes of operation with these devices: IDT Standard mode and First Word Fall Through (FWFT) mode. In IDT Standard mode, the first word written to an empty FIFO will not appear on the data output lines unless a specific read operation is performed. A read operation, which consists of activating REN and enabling a rising RCLK edge, will shift the word from internal memory to the data output lines. SuperSync FIFOs are particularly appropriate for networking, video, telecommunications, data communications and other applications that need to buffer large amounts of data. The input port is controlled by a Write Clock (WCLK) input and a Write Enable (WEN) input. Data is written into the FIFO on every rising edge of WCLK when WEN is asserted. The output port is controlled by a Read Clock (RCLK) input and Read Enable (REN) input. Data is read from the FIFO on every rising edge of RCLK when REN is asserted. An Output Enable (OE) input is provided for three-state control of the outputs. RCLK REN RT OE EF/OR VCC PAE PAF HF FF/IR LD FWFT/SI GND MRS WCLK PRS PIN CONFIGURATIONS PIN 1 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 WEN SEN DC VCC GND D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 48 47 46 45 44 43 42 41 40 39 38 37 15 16 34 33 36 35 Q17 Q16 GND Q15 Q14 VCC Q13 Q12 Q11 GND Q10 Q9 Q8 Q7 Q6 GND Q1 GND Q2 Q3 VCC Q4 Q5 GND Q0 D1 D0 D5 D4 D3 D2 D6 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 TQFP (PN64, ORDER CODE: PF) STQFP (PP64, ORDER CODE: TF) TOP VIEW NOTE: 1. DC = Don’t Care. Must be tied to GND or VCC, cannot be left open. 2 4670 drw02 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES DESCRIPTION (CONTINUED) programming, WEN together with LD on each rising edge of WCLK, are used to load the offset registers via Dn. REN together with LD on each rising edge of RCLK can be used to read the offsets in parallel from Qn regardless of whether serial or parallel offset loading has been selected. During Master Reset (MRS) the following events occur: The read and write pointers are set to the first location of the FIFO. The FWFT pin selects IDT Standard mode or FWFT mode. The LD pin selects either a partial flag default setting of 127 with parallel programming or a partial flag default setting of 1,023 with serial programming. The flags are updated according to the timing mode and default offsets selected. The Partial Reset (PRS) also sets the read and write pointers to the first location of the memory. However, the timing mode, partial flag programming method, and default or programmed offset settings existing before Partial Reset remain unchanged. The flags are updated according to the timing mode and offsets in effect. PRS is useful for resetting a device in mid-operation, when reprogramming partial flags would be undesirable. The Retransmit function allows data to be reread from the FIFO more than once. A LOW on the RT input during a rising RCLK edge initiates a retransmit operation by setting the read pointer to the first location of the memory array. If, at any time, the FIFO is not actively performing an operation, the chip will automatically power down. Once in the power down state, the standby supply current consumption is minimized. Initiating any operation (by activating control inputs) will immediately take the device out of the power down state. The IDT72255LA/72265LA are fabricated using IDT’s high speed submicron CMOS technology. In FWFT mode, the first word written to an empty FIFO is clocked directly to the data output lines after three transitions of the RCLK signal. A REN does not have to be asserted for accessing the first word. However, subsequent words written to the FIFO do require a LOW on REN for access. The state of the FWFT/ SI input during Master Reset determines the timing mode in use. For applications requiring more data storage capacity than a single FIFO can provide, the FWFT timing mode permits depth expansion by chaining FIFOs in series (i.e. the data outputs of one FIFO are connected to the corresponding data inputs of the next). No external logic is required. These FIFOs have five flag pins, EF/OR (Empty Flag or Output Ready), FF/ IR (Full Flag or Input Ready), HF (Half-full Flag), PAE (Programmable AlmostEmpty flag) and PAF (Programmable Almost-Full flag). The EF and FF functions are selected in IDT Standard mode. The IR and OR functions are selected in FWFT mode. HF, PAE and PAF are always available for use, irrespective of timing mode. PAE and PAF can be programmed independently to switch at any point in memory. (See Table I and Table 2.) Programmable offsets determine the flag switching threshold and can be loaded by two methods: parallel or serial. Two default offset settings are also provided, so that PAE can be set to switch at 127 or 1,023 locations from the empty boundary and the PAF threshold can be set at 127 or 1,023 locations from the full boundary. These choices are made with the LD pin during Master Reset. For serial programming, SEN together with LD on each rising edge of WCLK, are used to load the offset registers via the Serial Input (SI). For parallel PARTIAL RESET (PRS) MASTER RESET (MRS) WRITE CLOCK (WCLK) READ CLOCK (RCLK) WRITE ENABLE (WEN) READ ENABLE (REN) OUTPUT ENABLE (OE) LOAD (LD) DATA OUT (Q0 - Qn) DATA IN (D0 - Dn) SERIAL ENABLE(SEN) FIRST WORD FALL THROUGH/SERIAL INPUT (FWFT/SI) IDT 72255LA 72265LA RETRANSMIT (RT) EMPTY FLAG/OUTPUT READY (EF/OR) PROGRAMMABLE ALMOST-EMPTY (PAE) FULL FLAG/INPUT READY (FF/IR) HALF FULL FLAG (HF) PROGRAMMABLE ALMOST-FULL (PAF) 4670 drw03 Figure 1. Block Diagram of Single 8,192 x 18 and 16,384 x 18 Synchronous FIFO 3 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES PIN DESCRIPTION Symbol D0–D17 MRS Name Data Inputs Master Reset I/O I I PRS Partial Reset I RT Retransmit I FWFT/SI I WCLK First Word Fall Through/Serial In Write Clock I WEN RCLK Write Enable Read Clock I I REN OE SEN LD Read Enable Output Enable Serial Enable Load I I I I DC FF/IR Don't Care Full Flag/ Input Ready I O EF/OR Empty Flag/ Output Ready O PAF Programmable Almost-Full Flag O PAE Programmable Almost-Empty Flag O HF Q0–Q17 V CC GND Half-Full Flag Data Outputs Power Ground O O Description Data inputs for a 18-bit bus. MRS initializes the read and write pointers to zero and sets the output register to all zeroes. During Master Reset, the FIFO is configured for either FWFT or IDT Standard mode, one of two program mable flag default settings, and serial or parallel programming of the offset settings. PRS initializes the read and write pointers to zero and sets the output register to all zeroes. During Partial Reset, the existing mode (IDT or FWFT), programming method (serial or parallel), and programmable flag settings are all retained. RT asserted on the rising edge of RCLK initializes the READ pointer to zero, sets the EF flag to LOW (OR to HIGH in FWFT mode) temporarily and does not disturb the write pointer, programming method, existing timing mode or programmable flag settings. RT is useful to reread data from the first physical location of the FIFO. During Master Reset, selects First Word Fall Through or IDT Standard mode. After Master Reset, this pin functions as a serial input for loading offset registers. When enabled by WEN, the rising edge of WCLK writes data into the FIFO and offsets into the programmable registers for parallel programming, and when enabled by SEN, the rising edge of WCLK writes one bit of data into the programmable register for serial programming. WEN enables WCLK for writing data into the FIFO memory and offset registers. When enabled by REN, the rising edge of RCLK reads data from the FIFO memory and offsets from the programmable registers. REN enables RCLK for reading data from the FIFO memory and offset registers. OE controls the output impedance of Qn. SEN enables serial loading of programmable flag offsets. During Master Reset, LD selects one of two partial flag default offsets (127 or 1,023) and determines the flag offset programming method, serial or parallel. After Master Reset, this pin enables writing to and reading from the offset registers. This pin must be tied to either VCC or GND and must not toggle after Master Reset. In the IDT Standard mode, the FF function is selected. FF indicates whether or not the FIFO memory is full. In the FWFT mode, the IR function is selected. IR indicates whether or not there is space available for writing to the FIFO memory. In the IDT Standard mode, the EF function is selected. EF indicates whether or not the FIFO memory is empty. In FWFT mode, the OR function is selected. OR indicates whether or not there is valid data available at the outputs. PAF goes LOW if the number of words in the FIFO memory is more than total word capacity of the FIFO minus the full offset value m, which is stored in the Full Offset register. There are two possible default values for m: 127 or 1,023. PAE goes LOW if the number of words in the FIFO memory is less than offset n, which is stored in the Empty Offset register. There are two possible default values for n: 127 or 1,023. Other values for n can be programmed into the device. HF indicates whether the FIFO memory is more or less than half-full. Data outputs for an 18-bit bus. +5 Volt power supply pins. Ground pins. 4 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES ABSOLUTE MAXIMUM RATINGS Symbol VTERM TSTG IOUT Rating Terminal Voltage with respect to GND Com’l & Ind’l –0.5 to +7.0 Storage Temperature –55 to +125 DC Output Current –50 to +50 RECOMMENDED DC OPERATING CONDITIONS Unit V Symbol VCC °C GND mA NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Parameter Supply Voltage (Com’l/Ind’l) Supply Voltage (Com’l/Ind’l) Min. Typ. Max. Unit 4.0 5.0 5.5 V 0 0 0 V VIH Input High Voltage (Com’l/Ind’l) 2.0 ⎯ — V VIL Input Low Voltage (Com’l/Ind’l) ⎯ ⎯ 0.8 V TA Operating Temperature Commercial 0 ⎯ +70 °C TA Operating Temperature Industrial -40 ⎯ +85 °C (1) NOTE: 1. 1.5V undershoots are allowed for 10ns once per cycle. DC ELECTRICAL CHARACTERISTICS (Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = -40°C to +85°C) IDT72255LA IDT72265LA Commercial & Industrial(1) tCLK = 10, 15, 20 ns Symbol Parameter Min. Max. Unit ILI(2) ILO(3) Input Leakage Current Output Leakage Current –1 –10 1 10 µA µA VOH VOL Output Logic “1” Voltage, IOH = –2 mA Output Logic “0” Voltage, IOL = 8 mA 2.4 — — 0.4 V V ICC1(4,5,6) Active Power Supply Current — 80 mA ICC2(4,7) Standby Current — 20 mA NOTES: 1. Industrial temperature range product for 15ns and 20ns speed grades are available as a standard device. 2. Measurements with 0.4 ≤ VIN ≤ VCC. 3. OE ≥ VIH, 0.4 ≤ VOUT ≤ VCC. 4. Tested with outputs disabled (IOUT = 0). 5. RCLK and WCLK toggle at 20 MHz and data inputs switch at 10 MHz. 6. Typical ICC1 = 15 + 2.1*fS + 0.02*CL*fS (in mA) with VCC = 5V, TA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2, CL = capacitive load (in pF). 7. All Inputs = VCC –0.2V or GND + 0.2V, except RCLK and WCLK, which toggle at 20 MHz. CAPACITANCE (TA = +25°C, f = 1.0MHz) Symbol Parameter(1) Conditions Max. Unit (2) CIN Input Capacitance VIN = 0V 10 pF COUT(1,2) Output Capacitance VOUT = 0V 10 pF NOTES: 1. With output deselected, (OE ≥ VIH). 2. Characterized values, not currently tested. 5 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES AC ELECTRICAL CHARACTERISTICS(1) (Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = –40°C to +85°C) Commercial IDT72255LA10 IDT72265LA10 Symbol Parameter Commercial & Industrial(2) IDT72255LA15 IDT72255LA20 IDT72265LA15 IDT72265LA20 Min. Max. Min. Max. Min. Max. Unit fS Clock Cycle Frequency — 100 — 66.7 — 50 MHz tA Data Access Time 2 8 2 10 2 12 ns tCLK Clock Cycle Time 10 — 15 — 20 — ns tCLKH Clock High Time 4.5 — 6 — 8 — ns tCLKL Clock Low Time 4.5 — 6 — 8 — ns tDS Data Setup Time 3 — 4 — 5 — ns tDH Data Hold Time 0 — 1 — 1 — ns tENS Enable Setup Time 3 — 4 — 5 — ns tENH Enable Hold Time 0 — 1 — 1 — ns tLDS Load Setup Time 3 — 4 — 5 — ns tLDH Load Hold Time 0 — 1 — 1 — ns tRS Reset Pulse Width 10 — 15 — 20 — ns tRSS Reset Setup Time 10 — 15 — 20 — ns tRSR Reset Recovery Time 10 — 15 — 20 — ns tRSF Reset to Flag and Output Time — 10 — 15 — 20 ns tFWFT Mode Select Time 0 — 0 — 0 — ns tRTS Retransmit Setup Time 3 — 4 — 5 — ns tOLZ Output Enable to Output in Low Z(4) 0 — 0 — 0 — ns tOE Output Enable to Output Valid 2 6 3 8 3 10 ns tOHZ Output Enable to Output in High Z 2 6 3 8 3 10 ns tWFF Write Clock to FF or IR — 8 — 10 — 12 ns tREF Read Clock to EF or OR — 8 — 10 — 12 ns tPAF Write Clock to PAF — 8 — 10 — 12 ns tPAE Read Clock to PAE — 8 — 10 — 12 ns tHF Clock to HF — 16 — 20 — 22 ns tSKEW1 Skew time between RCLK and WCLK for FF/IR 5 — 6 — 10 — ns tSKEW2 Skew time between RCLK and WCLK for PAE and PAF 12 — 15 — 20 — ns tSKEW3 Skew time between RCLK and WCLK for EF/OR 60 — 60 — 60 — ns tSKEW4 Skew time between RCLK and WCLK for PAE and PAF for Re-transmit operation 15 — 17 — 25 — ns (3) (4) NOTES: 1. All AC timings apply to both Standard IDT mode and First Word Fall Through mode. 2. Industrial temperature range product for 15ns and 20ns speed grades are available as a standard device. 3. Pulse widths less than minimum values are not allowed. 4. Values guaranteed by design, not currently tested. 5V 1.1K D.U.T. AC TEST CONDITIONS Input Pulse Levels Input Rise/Fall Times Input Timing Reference Levels Output Reference Levels Output Load 680Ω GND to 3.0V 3ns 1.5V 1.5V See Figure 2 30pF* 4670 drw04 Figure 2. Output Load * Includes jig and scope capacitances. 6 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES FUNCTIONAL DESCRIPTION If the FIFO is full, the first read operation will cause FF to go HIGH. Subsequent read operations will cause PAF and HF to go HIGH at the conditions described in Table 1. If further read operations occur, without write operations, PAE will go LOW when there are n words in the FIFO, where n is the empty offset value. Continuing read operations will cause the FIFO to become empty. When the last word has been read from the FIFO, the EF will go LOW inhibiting further read operations. REN is ignored when the FIFO is empty. When configured in IDT Standard mode, the EF and FF outputs are double register-buffered outputs. Relevant timing diagrams for IDT Standard mode can be found in Figure 7, 8 and 11. TIMING MODES: IDT STANDARD vs FIRST WORD FALL THROUGH (FWFT) MODE The IDT72255LA/72265LA support two different timing modes of operation: IDT Standard mode or First Word Fall Through (FWFT) mode. The selection of which mode will operate is determined during Master Reset, by the state of the FWFT/SI input. If, at the time of Master Reset, FWFT/SI is LOW, then IDT Standard mode will be selected. This mode uses the Empty Flag (EF) to indicate whether or not there are any words present in the FIFO. It also uses the Full Flag function (FF) to indicate whether or not the FIFO has any free space for writing. In IDT Standard mode, every word read from the FIFO, including the first, must be requested using the Read Enable (REN) and RCLK. If, at the time of Master Reset, FWFT/SI is HIGH, then FWFT mode will be selected. This mode uses Output Ready (OR) to indicate whether or not there is valid data at the data outputs (Qn). It also uses Input Ready (IR) to indicate whether or not the FIFO has any free space for writing. In the FWFT mode, the first word written to an empty FIFO goes directly to Qn after three RCLK rising edges, REN = LOW is not necessary. Subsequent words must be accessed using the Read Enable (REN) and RCLK. Various signals, both input and output signals operate differently depending on which timing mode is in effect. FIRST WORD FALL THROUGH MODE (FWFT) In this mode, the status flags, IR, PAF, HF, PAE, and OR operate in the manner outlined in Table 2. To write data into to the FIFO, WEN must be LOW. Data presented to the DATA IN lines will be clocked into the FIFO on subsequent transitions of WCLK. After the first write is performed, the Output Ready (OR) flag will go LOW. Subsequent writes will continue to fill up the FIFO. PAE will go HIGH after n + 2 words have been loaded into the FIFO, where n is the empty offset value. The default setting for this value is stated in the footnote of Table 2. This parameter is also user programmable. See section on Programmable Flag Offset Loading. If one continued to write data into the FIFO, and we assumed no read operations were taking place, the HF would toggle to LOW once the 4,098th word for the IDT72255LA and 8,194th word for the IDT72265LA, respectively was written into the FIFO. Continuing to write data into the FIFO will cause the PAF to go LOW. Again, if no reads are performed, the PAF will go LOW after (8,193-m) writes for the IDT72255LA and (16,385-m) writes for the IDT72265LA, where m is the full offset value. The default setting for this value is stated in the footnote of Table 2. When the FIFO is full, the Input Ready (IR) flag will go HIGH, inhibiting further write operations. If no reads are performed after a reset, IR will go HIGH after D writes to the FIFO. D = 8,193 writes for the IDT72255LA and 16,385 writes for the IDT72265LA, respectively. Note that the additional word in FWFT mode is due to the capacity of the memory plus output register. If the FIFO is full, the first read operation will cause the IR flag to go LOW. Subsequent read operations will cause the PAF and HF to go HIGH at the conditions described in Table 2. If further read operations occur, without write operations, the PAE will go LOW when there are n + 1 words in the FIFO, where n is the empty offset value. Continuing read operations will cause the FIFO to become empty. When the last word has been read from the FIFO, OR will go HIGH inhibiting further read operations. REN is ignored when the FIFO is empty. When configured in FWFT mode, the OR flag output is triple registerbuffered, and the IR flag output is double register-buffered. Relevant timing diagrams for FWFT mode can be found in Figure 9, 10 and 12. IDT STANDARD MODE In this mode, the status flags, FF, PAF, HF, PAE, and EF operate in the manner outlined in Table 1. To write data into to the FIFO, Write Enable (WEN) must be LOW. Data presented to the DATA IN lines will be clocked into the FIFO on subsequent transitions of the Write Clock (WCLK). After the first write is performed, the Empty Flag (EF) will go HIGH. Subsequent writes will continue to fill up the FIFO. The Programmable Almost-Empty flag (PAE) will go HIGH after n + 1 words have been loaded into the FIFO, where n is the empty offset value. The default setting for this value is stated in the footnote of Table 1. This parameter is also user programmable. See section on Programmable Flag Offset Loading. If one continued to write data into the FIFO, and we assumed no read operations were taking place, the Half-Full flag (HF) would toggle to LOW once the 4,097th word for IDT72255LA and 8,193th word for IDT72265LA respectively was written into the FIFO. Continuing to write data into the FIFO will cause the Programmable Almost-Full flag (PAF) to go LOW. Again, if no reads are performed, the PAF will go LOW after (8,192-m) writes for the IDT72255LA and (16,384-m) writes for the IDT72265LA. The offset “m” is the full offset value. The default setting for this value is stated in the footnote of Table 1. This parameter is also user programmable. See section on Programmable Flag Offset Loading. When the FIFO is full, the Full Flag (FF) will go LOW, inhibiting further write operations. If no reads are performed after a reset, FF will go LOW after D writes to the FIFO. D = 8,192 writes for the IDT72255LA and 16,384 for the IDT72265LA, respectively. 7 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES PROGRAMMING FLAG OFFSETS Full and Empty Flag offset values are user programmable. The IDT72255LA/72265LA has internal registers for these offsets. Default settings are stated in the footnotes of Table 1 and Table 2. Offset values can be programmed into the FIFO in one of two ways; serial or parallel loading method. The selection of the loading method is done using the LD (Load) pin. During Master Reset, the state of the LD input determines whether serial or parallel flag offset programming is enabled. A HIGH on LD during Master Reset selects serial loading of offset values and in addition, sets a default PAE offset value of 3FFH (a threshold 1,023 words from the empty boundary), and a default PAF offset value of 3FFH (a threshold 1,023 words from the full boundary). A LOW on LD during Master Reset selects parallel loading of offset values, and in addition, sets a default PAE offset value of 07FH (a threshold 127 words from the empty boundary), and a default PAF offset value of 07FH (a threshold 127 words from the full boundary). See Figure 3, Offset Register Location and Default Values. In addition to loading offset values into the FIFO, it also possible to read the current offset values. It is only possible to read offset values via parallel read. Figure 4, Programmable Flag Offset Programming Sequence, summarizes the control pins and sequence for both serial and parallel programming modes. For a more detailed description, see discussion that follows. The offset registers may be programmed (and reprogrammed) any time after Master Reset, regardless of whether serial or parallel programming has been selected. TABLE 1 — STATUS FLAGS FOR IDT STANDARD MODE IDT72255LA Number of Words in FIFO IDT72265LA FF PAF HF PAE EF 0 0 H H H L L 1 to n (1) 1 to n (1) H H H L H (n + 1) to 4,096 (n + 1) to 8,192 H H H H H 4,097 to (8,192–(m+1)) 8,193 to (16,384–(m+1)) H H L H H (16,384–m) (2) H L L H H L L L H H (8,192–m) (2) to 8,191 8,192 to 16,383 16,384 NOTES: 1. n = Empty Offset, Default Values: n = 127 when parallel offset loading is selected or n = 1,023 when serial offset loading is selected. 2. m = Full Offset, Default Values: m = 127 when parallel offset loading is selected or m = 1,023 when serial offset loading is selected. TABLE 2 — STATUS FLAGS FOR FWFT MODE Number of Words in FIFO (1) IDT72255LA IDT72265LA 0 0 1 to n+1 (1) 1 to n+1 (1) L H H L L (n + 2) to 4,097 (n + 2) to 8,193 L H H H L 4,098 to (8,193–(m+1))(2) 8,194 to (16,385–(m+1)) (2) L H L H L (8,193–m) to 8,192 (16,385–m) (2) to 16,384 L L L H L 8,193 16,385 H L L H L NOTES: 1. n = Empty Offset, Default Values: n = 127 when parallel offset loading is selected or n = 1,023 when serial offset loading is selected. 2. m = Full Offset, Default Values: m = 127 when parallel offset loading is selected or m = 1,023 when serial offset loading is selected. 8 FF PAF HF L H H PAE EF L H IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES 72255LA — 8,192 x 18–BIT 72265LA — 16,384 x 18–BIT 12 17 0 13 17 0 EMPTY OFFSET REGISTER EMPTY OFFSET REGISTER DEFAULT VALUE 07FH if LD is LOW at Master Reset, 3FFH if LD is HIGH at Master Reset 17 DEFAULT VALUE 07FH if LD is LOW at Master Reset, 3FFH if LD is HIGH at Master Reset 0 12 17 0 13 FULL OFFSET REGISTER FULL OFFSET REGISTER DEFAULT VALUE 07FH if LD is LOW at Master Reset, 3FFH if LD is HIGH at Master Reset DEFAULT VALUE 07FH if LD is LOW at Master Reset, 3FFH if LD is HIGH at Master Reset 4670 drw06 Figure 3. Offset Register Location and Default Values LD WEN REN SEN 0 0 1 1 0 1 0 1 0 1 1 0 X 1 1 1 1 0 X X 1 X 0 X X 1 1 1 X X WCLK Selection RCLK X Parallel write to registers: Empty Offset Full Offset Parallel read from registers: Empty Offset Full Offset X X X Serial shift into registers: 26 bits for the 72255LA 28 bits for the 72265LA 1 bit for each rising WCLK edge Starting with Empty Offset (LSB) Ending with Full Offset (MSB) X No Operation X Write Memory Read Memory X No Operation 4670 drw07 NOTES: 1. The programming method can only be selected at Master Reset. 2. Parallel reading of the offset registers is always permitted regardless of which programming method has been selected. 3. The programming sequence applies to both IDT Standard and FWFT modes. Figure 4. Programmable Flag Offset Programming Sequence 9 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES alternative to holding WEN LOW and toggling LD, parallel programming can also be interrupted by setting LD LOW and toggling WEN. Note that the status of a partial flag (PAE or PAF) output is invalid during the programming process. From the time parallel programming has begun, a partial flag output will not be valid until the appropriate offset word has been written to the register(s) pertaining to that flag. Measuring from the rising WCLK edge that achieves the above criteria; PAF will be valid after two more rising WCLK edges plus tPAF, PAE will be valid after the next two rising RCLK edges plus tPAE plus tSKEW2. The act of reading the offset registers employs a dedicated read offset register pointer. The contents of the offset registers can be read on the Q0Qn pins when LD is set LOW and REN is set LOW. Data are read via Qn from the Empty Offset Register on the first LOW-to-HIGH transition of RCLK. Upon the second LOW-to-HIGH transition of RCLK, data are read from the Full Offset Register. The third transition of RCLK reads, once again, from the Empty Offset Register. See Figure 15, Parallel Read of Programmable Flag Registers, for the timing diagram for this mode. It is permissible to interrupt the offset register read sequence with reads or writes to the FIFO. The interruption is accomplished by deasserting REN, LD, or both together. When REN and LD are restored to a LOW level, reading of the offset registers continues where it left off. It should be noted, and care should be taken from the fact that when a parallel read of the flag offsets is performed, the data word that was present on the output lines Qn will be overwritten. Parallel reading of the offset registers is always permitted regardless of which timing mode (IDT Standard or FWFT modes) has been selected. SERIAL PROGRAMMING MODE If Serial Programming mode has been selected, as described above, then programming of PAE and PAF values can be achieved by using a combination of the LD, SEN, WCLK and SI input pins. Programming PAE and PAF proceeds as follows: when LD and SEN are set LOW, data on the SI input are written, one bit for each WCLK rising edge, starting with the Empty Offset LSB and ending with the Full Offset MSB. A total of 26 bits for the IDT72255LA and 28 bits for the IDT72265LA. See Figure 13, Serial Loading of Programmable Flag Registers, for the timing diagram for this mode. Using the serial method, individual registers cannot be programmed selectively. PAE and PAF can show a valid status only after the complete set of bits (for all offset registers) has been entered. The registers can be reprogrammed as long as the complete set of new offset bits is entered. When LD is LOW and SEN is HIGH, no serial write to the registers can occur. Write operations to the FIFO are allowed before and during the serial programming sequence. In this case, the programming of all offset bits does not have to occur at once. A select number of bits can be written to the SI input and then, by bringing LD and SEN HIGH, data can be written to FIFO memory via Dn by toggling WEN. When WEN is brought HIGH with LD and SEN restored to a LOW, the next offset bit in sequence is written to the registers via SI. If an interruption of serial programming is desired, it is sufficient either to set LD LOW and deactivate SEN or to set SEN LOW and deactivate LD. Once LD and SEN are both restored to a LOW level, serial offset programming continues. From the time serial programming has begun, neither partial flag will be valid until the full set of bits required to fill all the offset registers has been written. Measuring from the rising WCLK edge that achieves the above criteria; PAF will be valid after two more rising WCLK edges plus tPAF, PAE will be valid after the next two rising RCLK edges plus tPAE plus tSKEW2. It is not possible to read the flag offset values in a serial mode. RETRANSMIT OPERATION The Retransmit operation allows data that has already been read to be accessed again. There are two stages: first, a setup procedure that resets the read pointer to the first location of memory, then the actual retransmit, which consists of reading out the memory contents, starting at the beginning of memory. Retransmit setup is initiated by holding RT LOW during a rising RCLK edge. REN and WEN must be HIGH before bringing RT LOW. At least one word, but no more than D - 2 words should have been written into the FIFO between Reset (Master or Partial) and the time of Retransmit setup. D = 8,192 for the IDT72255LA and D = 16,384 for the IDT72265LA. In FWFT mode, D = 8,193 for the IDT72255LA and D = 16,385 for the IDT72265LA. If IDT Standard mode is selected, the FIFO will mark the beginning of the Retransmit setup by setting EF LOW. The change in level will only be noticeable if EF was HIGH before setup. During this period, the internal read pointer is initialized to the first location of the RAM array. When EF goes HIGH, Retransmit setup is complete and read operations may begin starting with the first location in memory. Since IDT Standard mode is selected, every word read including the first word following Retransmit setup requires a LOW on REN to enable the rising edge of RCLK. See Figure 11, Retransmit Timing (IDT Standard Mode), for the relevant timing diagram. If FWFT mode is selected, the FIFO will mark the beginning of the Retransmit setup by setting OR HIGH. During this period, the internal read pointer is set to the first location of the RAM array. When OR goes LOW, Retransmit setup is complete; at the same time, the contents of the first location appear on the outputs. Since FWFT mode is selected, the first word appears on the outputs, no LOW on REN is necessary. Reading all subsequent words requires a LOW on REN to PARALLEL MODE If Parallel Programming mode has been selected, as described above, then programming of PAE and PAF values can be achieved by using a combination of the LD, WCLK , WEN and Dn input pins. ProgrammingPAE and PAF proceeds as follows: when LD and WEN are set LOW, data on the inputs Dn are written into the Empty Offset Register on the first LOW-toHIGH transition of WCLK. Upon the second LOW-to-HIGH transition of WCLK, data are written into the Full Offset Register. The third transition of WCLK writes, once again, to the Empty Offset Register. See Figure 14, Parallel Loading of Programmable Flag Registers, for the timing diagram for this mode. The act of writing offsets in parallel employs a dedicated write offset register pointer. The act of reading offsets employs a dedicated read offset register pointer. The two pointers operate independently; however, a read and a write should not be performed simultaneously to the offset registers. A Master Reset initializes both pointers to the Empty Offset (LSB) register. A Partial Reset has no effect on the position of these pointers. Write operations to the FIFO are allowed before and during the parallel programming sequence. In this case, the programming of all offset registers does not have to occur at one time. One, two or more offset registers can be written and then by bringing LD HIGH, write operations can be redirected to the FIFO memory. When LD is set LOW again, and WEN is LOW, the next offset register in sequence is written to. As an 10 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES enable the rising edge of RCLK. See Figure 12, Retransmit Timing (FWFT Mode), for the relevant timing diagram. For either IDT Standard mode or FWFT mode, updating of the PAE, HF and PAF flags begin with the rising edge of RCLK that RT is setup. PAE is synchronized to RCLK, thus on the second rising edge of RCLK after RT is setup, the PAE flag will be updated. HF is asynchronous, thus the rising edge of RCLK that RT is setup will update HF. PAF is synchronized to WCLK, thus the second rising edge of WCLK that occurs tSKEW after the rising edge of RCLK that RT is setup will update PAF. RT is synchronized to RCLK. 11 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES SIGNAL DESCRIPTION the read pointer to the first location of memory, then the actual retransmit, which consists of reading out the memory contents, starting at beginning of the memory. Retransmit setup is initiated by holding RT LOW during a rising RCLK edge. REN and WEN must be HIGH before bringing RT LOW. If IDT Standard mode is selected, the FIFO will mark the beginning of the Retransmit setup by setting EF LOW. The change in level will only be noticeable if EF was HIGH before setup. During this period, the internal read pointer is initialized to the first location of the RAM array. When EF goes HIGH, Retransmit setup is complete and read operations may begin starting with the first location in memory. Since IDT Standard mode is selected, every word read including the first word following Retransmit setup requires a LOW on REN to enable the rising edge of RCLK. See Figure 11, Retransmit Timing (IDT Standard Mode), for the relevant timing diagram. If FWFT mode is selected, the FIFO will mark the beginning of the Retransmit setup by setting OR HIGH. During this period, the internal read pointer is set to the first location of the RAM array. When OR goes LOW, Retransmit setup is complete; at the same time, the contents of the first location appear on the outputs. Since FWFT mode is selected, the first word appears on the outputs, no LOW on REN is necessary. Reading all subsequent words requires a LOW on REN to enable the rising edge of RCLK. See Figure 12, Retransmit Timing (FWFT Mode), for the relevant timing diagram. INPUTS: DATA IN (D0 - D17) Data inputs for 18-bit wide data. CONTROLS: MASTER RESET (MRS) A Master Reset is accomplished whenever the MRS input is taken to a LOW state. This operation sets the internal read and write pointers to the first location of the RAM array. PAE will go LOW, PAF will go HIGH, and HF will go HIGH. If FWFT is LOW during Master Reset then the IDT Standard mode, along with EF and FF are selected. EF will go LOW and FF will go HIGH. If FWFT is HIGH, then the First Word Fall Through mode (FWFT), along with IR and OR, are selected. OR will go HIGH and IR will go LOW. If LD is LOW during Master Reset, then PAE is assigned a threshold 127 words from the empty boundary and PAF is assigned a threshold 127 words from the full boundary; 127 words corresponds to an offset value of 07FH. Following Master Reset, parallel loading of the offsets is permitted, but not serial loading. If LD is HIGH during Master Reset, then PAE is assigned a threshold 1,023 words from the empty boundary and PAF is assigned a threshold 1,023 words from the full boundary; 1,023 words corresponds to an offset value of 3FFH. Following Master Reset, serial loading of the offsets is permitted, but not parallel loading. Parallel reading of the registers is always permitted. (See section describing the LD pin for further details.) During a Master Reset, the output register is initialized to all zeroes. A Master Reset is required after power up, before a write operation can take place. MRS is asynchronous. See Figure 5, Master Reset Timing, for the relevant timing diagram. FIRST WORD FALL THROUGH/SERIAL IN (FWFT/SI) This is a dual purpose pin. During Master Reset, the state of the FWFT/ SI input determines whether the device will operate in IDT Standard mode or First Word Fall Through (FWFT) mode. If, at the time of Master Reset, FWFT/SI is LOW, then IDT Standard mode will be selected. This mode uses the Empty Flag (EF) to indicate whether or not there are any words present in the FIFO memory. It also uses the Full Flag function (FF) to indicate whether or not the FIFO memory has any free space for writing. In IDT Standard mode, every word read from the FIFO, including the first, must be requested using the Read Enable (REN) and RCLK. If, at the time of Master Reset, FWFT/SI is HIGH, then FWFT mode will be selected. This mode uses Output Ready (OR) to indicate whether or not there is valid data at the data outputs (Qn). It also uses Input Ready (IR) to indicate whether or not the FIFO memory has any free space for writing. In the FWFT mode, the first word written to an empty FIFO goes directly to Qn after three RCLK rising edges, REN = LOW is not necessary. Subsequent words must be accessed using the Read Enable (REN) and RCLK. After Master Reset, FWFT/SI acts as a serial input for loading PAE and PAF offsets into the programmable registers. The serial input function can only be used when the serial loading method has been selected during Master Reset. Serial programming using the FWFT/SI pin functions the same way in both IDT Standard and FWFT modes. PARTIAL RESET (PRS) A Partial Reset is accomplished whenever the PRS input is taken to a LOW state. As in the case of the Master Reset, the internal read and write pointers are set to the first location of the RAM array, PAE goes LOW, PAF goes HIGH, and HF goes HIGH. Whichever mode is active at the time of Partial Reset, IDT Standard mode or First Word Fall Through, that mode will remain selected. If the IDT Standard mode is active, then FF will go HIGH and EF will go LOW. If the First Word Fall Through mode is active, then OR will go HIGH, and IR will go LOW. Following Partial Reset, all values held in the offset registers remain unchanged. The programming method (parallel or serial) currently active at the time of Partial Reset is also retained. The output register is initialized to all zeroes. PRS is asynchronous. A Partial Reset is useful for resetting the device during the course of operation, when reprogramming partial flag offset settings may not be convenient. See Figure 6, Partial Reset Timing, for the relevant timing diagram. WRITE CLOCK (WCLK) A write cycle is initiated on the rising edge of the WCLK input. Data setup and hold times must be met with respect to the LOW-to-HIGH transition of the WCLK. It is permissible to stop the WCLK. Note that while WCLK is idle, the FF/IR, PAF and HF flags will not be updated. (Note that WCLK is only capable of updating HF flag to LOW). The Write and Read Clocks can either be independent or coincident. RETRANSMIT (RT) The Retransmit operation allows data that has already been read to be accessed again. There are two stages: first, a setup procedure that resets 12 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES WRITE ENABLE (WEN) When the WEN input is LOW, data may be loaded into the FIFO RAM array on the rising edge of every WCLK cycle if the device is not full. Data is stored in the RAM array sequentially and independently of any ongoing read operation. When WEN is HIGH, no new data is written in the RAM array on each WCLK cycle. To prevent data overflow in the IDT Standard mode, FF will go LOW, inhibiting further write operations. Upon the completion of a valid read cycle, FF will go HIGH allowing a write to occur. The FF is updated by two WCLK cycles + tSKEW after the RCLK cycle. To prevent data overflow in the FWFT mode, IR will go HIGH, inhibiting further write operations. Upon the completion of a valid read cycle, IR will go LOW allowing a write to occur. The IR flag is updated by two WCLK cycles + tSKEW after the valid RCLK cycle. WEN is ignored when the FIFO is full in either FWFT or IDT Standard mode. OUTPUT ENABLE (OE) When Output Enable is enabled (LOW), the parallel output buffers receive data from the output register. When OE is HIGH, the output data bus (Qn) goes into a high impedance state. LOAD (LD) This is a dual purpose pin. During Master Reset, the state of the LD input determines one of two default offset values (127 or 1,023) for the PAE and PAF flags, along with the method by which these offset registers can be programmed, parallel or serial. After Master Reset, LD enables write operations to and read operations from the offset registers. Only the offset loading method currently selected can be used to write to the registers. Offset registers can be read only in parallel. A LOW on LD during Master Reset selects a default PAE offset value of 07FH (a threshold 127 words from the empty boundary), a default PAF offset value of 07FH (a threshold 127 words from the full boundary), and parallel loading of other offset values. A HIGH on LD during Master Reset selects a default PAE offset value of 3FFH (a threshold 1,023 words from the empty boundary), a default PAF offset value of 3FFH (a threshold 1,023 words from the full boundary), and serial loading of other offset values. After Master Reset, the LD pin is used to activate the programming process of the flag offset values PAE and PAF. Pulling LD LOW will begin a serial loading or parallel load or read of these offset values. See Figure 4, Programmable Flag Offset Programming Sequence. READ CLOCK (RCLK) A read cycle is initiated on the rising edge of the RCLK input. Data can be read on the outputs, on the rising edge of the RCLK input. It is permissible to stop the RCLK. Note that while RCLK is idle, the EF/OR, PAE and HF flags will not be updated. (Note that RCLK is only capable of updating the HF flag to HIGH). The Write and Read Clocks can be independent or coincident. OUTPUTS: READ ENABLE (REN) When Read Enable is LOW, data is loaded from the RAM array into the output register on the rising edge of every RCLK cycle if the device is not empty. When the REN input is HIGH, the output register holds the previous data and no new data is loaded into the output register. The data outputs Q0-Qn maintain the previous data value. In the IDT Standard mode, every word accessed at Qn, including the first word written to an empty FIFO, must be requested using REN. When the last word has been read from the FIFO, the Empty Flag (EF) will go LOW, inhibiting further read operations. REN is ignored when the FIFO is empty. Once a write is performed, EF will go HIGH allowing a read to occur. The EF flag is updated by two RCLK cycles + tSKEW after the valid WCLK cycle. In the FWFT mode, the first word written to an empty FIFO automatically goes to the outputs Qn, on the third valid LOW to HIGH transition of RCLK + tSKEW after the first write. REN does not need to be asserted LOW. In order to access all other words, a read must be executed using REN. The RCLK LOW to HIGH transition after the last word has been read from the FIFO, Output Ready (OR) will go HIGH with a true read (RCLK with REN = LOW), inhibiting further read operations. REN is ignored when the FIFO is empty. FULL FLAG (FF/IR) This is a dual purpose pin. In IDT Standard mode, the Full Flag (FF) function is selected. When the FIFO is full, FF will go LOW, inhibiting further write operations. When FF is HIGH, the FIFO is not full. If no reads are performed after a reset (either MRS or PRS), FF will go LOW after D writes to the FIFO (D = 8,192 for the IDT72255LA and 16,384 for the IDT72265LA). See Figure 7, Write Cycle and Full Flag Timing (IDT Standard Mode), for the relevant timing information. In FWFT mode, the Input Ready (IR) function is selected. IR goes LOW when memory space is available for writing in data. When there is no longer any free space left, IR goes HIGH, inhibiting further write operations. If no reads are performed after a reset (either MRS or PRS), IR will go HIGH after D writes to the FIFO (D = 8,193 for the IDT72255LA and 16,385 for the IDT72265LA) See Figure 9, Write Timing (FWFT Mode), for the relevant timing information. The IR status not only measures the contents of the FIFO memory, but also counts the presence of a word in the output register. Thus, in FWFT mode, the total number of writes necessary to deassert IR is one greater than needed to assert FF in IDT Standard mode. FF/IR is synchronous and updated on the rising edge of WCLK. FF/IR are double register-buffered outputs. SERIAL ENABLE (SEN) The SEN input is an enable used only for serial programming of the offset registers. The serial programming method must be selected during Master Reset. SEN is always used in conjunction with LD. When these lines are both LOW, data at the SI input can be loaded into the program register one bit for each LOW-to-HIGH transition of WCLK. (See Figure 4.) When SEN is HIGH, the programmable registers retains the previous settings and no offsets are loaded. SEN functions the same way in both IDT Standard and FWFT modes. EMPTY FLAG (EF/OR) This is a dual purpose pin. In the IDT Standard mode, the Empty Flag (EF) function is selected. When the FIFO is empty, EF will go LOW, inhibiting further read operations. When EF is HIGH, the FIFO is not empty. See Figure 8, Read Cycle, Empty Flag and First Word Latency Timing (IDT Standard Mode), for the relevant timing information. In FWFT mode, the Output Ready (OR) function is selected. OR goes LOW at the same time that the first word written to an empty FIFO appears valid on the outputs. OR stays LOW after the RCLK LOW to HIGH transition 13 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES LOW when there are n words or less in the FIFO. The offset “n” is the empty offset value. The default setting for this value is stated in the footnote of Table 1. In FWFT mode, the PAE will go LOW when there are n+1 words or less in the FIFO. The default setting for this value is stated in the footnote of Table 2. See Figure 17, Programmable Almost-Empty Flag Timing (IDT Standard and FWFT Mode), for the relevant timing information. PAE is synchronous and updated on the rising edge of RCLK. that shifts the last word from the FIFO memory to the outputs. OR goes HIGH only with a true read (RCLK with REN = LOW). The previous data stays at the outputs, indicating the last word was read. Further data reads are inhibited until OR goes LOW again. See Figure 10, Read Timing (FWFT Mode), for the relevant timing information. EF/OR is synchronous and updated on the rising edge of RCLK. In IDT Standard mode, EF is a double register-buffered output. In FWFT mode, OR is a triple register-buffered output. PROGRAMMABLE ALMOST-FULL FLAG (PAF) The Programmable Almost-Full flag (PAF) will go LOW when the FIFO reaches the almost-full condition. In IDT Standard mode, if no reads are performed after reset (MRS), PAF will go LOW after (D - m) words are written to the FIFO. The PAF will go LOW after (8,192-m) writes for the IDT72255LA and (16,384-m) writes for the IDT72265LA. The offset “m” is the full offset value. The default setting for this value is stated in the footnote of Table 1. In FWFT mode, the PAF will go LOW after (8,193-m) writes for the IDT72255LA and (16,385-m) writes for the IDT72265LA, where m is the full offset value. The default setting for this value is stated in the footnote of Table 2. See Figure 16, Programmable Almost-Full Flag Timing (IDT Standard and FWFT Mode), for the relevant timing information. PAF is synchronous and updated on the rising edge of WCLK. HALF-FULL FLAG (HF) This output indicates a half-full FIFO. The rising WCLK edge that fills the FIFO beyond half-full sets HF LOW. The flag remains LOW until the difference between the write and read pointers becomes less than or equal to half of the total depth of the device; the rising RCLK edge that accomplishes this condition sets HF HIGH. In IDT Standard mode, if no reads are performed after reset (MRS or PRS), HF will go LOW after (D/2 + 1) writes to the FIFO, where D = 8,192 for the IDT72255LA and 16,384 for the IDT72265LA. In FWFT mode, if no reads are performed after reset (MRS or PRS), HF will go LOW after (D-1/2 + 2) writes to the FIFO, where D = 8,193 for the IDT72255LA and 16,385 for the IDT72265LA. See Figure 18, Half-Full Flag Timing (IDT Standard and FWFT Modes), for the relevant timing information. Because HF is updated by both RCLK and WCLK, it is considered asynchronous. PROGRAMMABLE ALMOST-EMPTY FLAG (PAE) The Programmable Almost-Empty flag (PAE) will go LOW when the FIFO reaches the almost-empty condition. In IDT Standard mode, PAE will go DATA OUTPUTS (Q0-Q17) (Q0 - Q17) are data outputs for 18-bit wide data. 14 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES tRS MRS tRSS tRSR tRSS tRSR REN WEN tRSR tFWFT FWFT/SI tRSS tRSR LD tRSS RT tRSS SEN If FWFT = HIGH, OR = HIGH tRSF EF/OR If FWFT = LOW, EF = LOW tRSF If FWFT = LOW, FF = HIGH FF/IR If FWFT = HIGH, IR = LOW tRSF PAE tRSF PAF, HF tRSF OE = HIGH Q0 - Qn OE = LOW Figure 5. Master Reset Timing 15 4670 drw08 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 PRS COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES tRS tRSS tRSR tRSS tRSR REN WEN tRSS RT tRSS SEN If FWFT = HIGH, OR = HIGH tRSF EF/OR If FWFT = LOW, EF = LOW If FWFT = LOW, FF = HIGH tRSF FF/IR If FWFT = HIGH, IR = LOW tRSF PAE tRSF PAF, HF tRSF OE = HIGH Q0 - Qn OE = LOW Figure 6. Partial Reset Timing 16 4670 drw09 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES tCLK tCLKH NO WRITE WCLK tSKEW1 NO WRITE tCLKL 2 1 1 (1) (1) tDS D0 - Dn 2 tSKEW1 tDH tDS tDH DX DX+1 tWFF tWFF tWFF tWFF FF WEN RCLK tENS tENS tENH tENH REN tA Q0 - Qn tA DATA IN OUTPUT REGISTER DATA READ NEXT DATA READ 4670 drw10 NOTES: 1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go high (after one WCLK cycle pus tWFF). If the time between the rising edge of the RCLK and the rising edge of the WCLK is less than tSKEW1, then the FF deassertion may be delayed one extra WCLK cycle. 2. LD = HIGH, OE = LOW, EF = HIGH Figure 7. Write Cycle and Full Flag Timing (IDT Standard Mode) tCLK tCLKH RCLK 1 tENS tCLKL 2 tENH tENS tENH tENH tENS NO OPERATION NO OPERATION tREF tREF tREF tA tA Q0 - Qn LAST WORD tOLZ LAST WORD tA D0 D1 tOLZ tOHZ tOE (1) tSKEW3 WCLK tENS tDS D0 - Dn D0 tENH tENS tENH tDHS tDS tDH D1 4670 drw 11 NOTES: 1. tSKEW3 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that EF will go HIGH (after one RCLK cycle plus tREF). If the time between the rising edge of WCLK and the rising edge of RCLK is less than tSKEW3, then EF deassertion may be delayed one extra RCLK cycle. 2. LD = HIGH. 3. First word latency: 60ns + tREF + 1*TRCLK. Figure 8. Read Cycle, Empty Flag and First Data Word Latency Timing (IDT Standard Mode) 17 18 tDS W1 tENS W2 2 DATA IN OUTPUT REGISTER 1 tSKEW3(1) tDH W3 3 tREF tA W4 tDS W1 W[n +2] W[n+3] 1 tPAE tSKEW2(2) 2 W[n+4] W[ D-1 ] tDS W[ D-1 ] tHF W[ D-1 ] W[D-m-2] tDS W[D-m-1] W[D-m] 1 tPAF W[D-m+1] W[D-m+2] W[D-1] WD 4670 drw 12 tWFF tENH Figure 9. Write Timing (First Word Fall Through Mode) NOTES: 1. tSKEW3 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that OR will go LOW after two RCLK cycles plus tREF. If the time between the rising edge of WCLK and the rising edge of RCLK is less than tSKEW3, then OR assertion may be delayed one extra RCLK cycle. 2. tSKEW2 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that PAE will go HIGH after one RCLK cycle plus tPAE. If the time between the rising edge of WCLK and the rising edge of RCLK is less than tSKEW2, then the PAE deassertion may be delayed one extra RCLK cycle. 3. LD = HIGH, OE = LOW 4. n = PAE offset, m = PAF offset and D = maximum FIFO depth. 5. D = 8,193 for IDT72255LA and 16,385 for IDT72265LA. 6. First word latency: 60ns + tREF + 2*TRCLK. Q0 - Q17 RCLK D0 - D17 WCLK IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES 19 W1 tOHZ tWFF tENS tDH tDS WD tENH tENS W1 tOE tA W2 1 tSKEW1(1) tA 2 tWFF W3 Wm+2 (2) tSKEW2 W[m+3] tA tPAF W[m+4] W[ D-1 ] tHF W[ D-1 tA ] W[D-n-1] tA W[D-n] 1 tPAE W[D-n+1] W[D-n+2] W[D-1] tA tENS WD 4670 drw 13 tREF Figure 10. Read Timing (First Word Fall Through Mode) NOTES: 1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that IR will go LOW after one WCLK cycle plus tWFF. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW1, then the IR assertion may be delayed one extra WCLK cycle. 2. tSKEW2 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that PAF will go HIGH after one WCLK cycle plus tPAF. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW2, then the PAF deassertion may be delayed one extra WCLK cycle. 3. LD = HIGH 4. n = PAE Offset, m = PAF offset and D = maximum FIFO depth. 5. D = 8,193 for IDT72255LA and 16,385 for IDT72265LA. Q0 - Q17 RCLK D0 - D17 WCLK IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES RCLK 2 1 tENS tENH tENS tRTS tENH REN tA Q0 - Qn tA Wx tA Wx+1 W1 (3) W2 (3) tSKEW4 1 WCLK 2 tRTS WEN tENS tENH RT tREF tREF (5) EF tPAE PAE tHF HF tPAF PAF 4670 drw 14 NOTES: 1. Retransmit setup is complete after EF returns HIGH, only then can a read operation begin. 2. OE = LOW. 3. W1 = first word written to the FIFO after Master Reset, W2 = second word written to the FIFO after Master Reset. 4. No more than D –2 may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, FF will be HIGH throughout the Retransmit setup procedure. D = 8,192 for IDT72255LA and 16,384 for IDT72265LA. 5. EF goes HIGH at 60 ns + 1 RCLK cycle + tREF. Figure 11. Retransmit Timing (IDT Standard Mode) 20 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES RCLK 1 tENH tENS 3 2 4 tENH tENH tRTS REN tA tA Q0 - Qn Wx Wx+1 W1 (4) W2 W3 tSKEW4 1 WCLK 2 tRTS WEN tENS tENH RT tREF tREF (5) OR tPAE PAE tHF HF tPAF PAF 4670 drw15 NOTES: 1. Retransmit setup is complete after OR returns LOW. 2. No more than D –2 words may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, IR will be LOW throughout the Retransmit setup procedure. D = 8,193 for the IDT72255LA and 16,385 for the IDT72265LA. 3. OE = LOW 4. W1, W2, W3 = first, second and third words written to the FIFO after Master Reset. 5. OR goes LOW at 60 ns + 2 RCLK cycles + tREF. Figure 12. Retransmit Timing (FWFT Mode) WCLK tENS tLDS tENH tENH tLDH tLDH tDH tDS SI BIT 0 BIT X EMPTY OFFSET (1) BIT 0 BIT X FULL OFFSET NOTE: 1. X = 12 for the IDT72255LA and X = 13 for the IDT72265LA. Figure 13. Serial Loading of Programmable Flag Registers (IDT Standard and FWFT Modes) 21 (1) 4670 drw 16 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES t CLK t CLKH t CLKL WCLK t LDS t LDH t LDH t ENS t ENH tENH t DS tDH t DH PAE OFFSET D0 - D15 PAF OFFSET 4670 drw 17 Figure 14. Parallel Loading of Programmable Flag Registers (IDT Standard and FWFT Modes) t CLK t CLKH t CLKL RCLK t LDS t LDH t ENS t LDH t ENH t ENH tA tA DATA IN OUTPUT REGISTER Q0 - Q15 PAE OFFSET PAF OFFSET 4670 drw 18 NOTE: 1. OE = LOW Figure 15. Parallel Read of Programmable Flag Registers (IDT Standard and FWFT Modes) t CLKH t CLKL WCLK 1 tENS 1 2 2 tENH tPAF D - (m+1) words in FIFO tPAF (2) D - m words in FIFO (2) (3) D-(m+1) words in FIFO(2) t SKEW2 RCLK tENS tENH 4670 drw 19 NOTES: 1. m = PAF offset. 2. D = maximum FIFO depth. In IDT Standard mode: D = 8,192 for the IDT72255LA and 16,384 for the IDT72265LA. In FWFT mode: D = 8,193 for the IDT72255LA and 16,385 for the IDT72265LA. 3. tSKEW2 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that PAF will go HIGH (after one WCLK cycle plus tPAF). If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW2, then the PAF deassertion time may be delayed one extra WCLK cycle. 4. PAF is asserted and updated on the rising edge of WCLK only. Figure 16. Programmable Almost-Full Flag Timing (IDT Standard and FWFT Modes) 22 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 t CLKH COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES t CLKL WCLK tENS tENH n words in FIFO (2), n+1 words in FIFO (3) tSKEW2 (4) RCLK n words in FIFO (2), n+1 words in FIFO (3) n+1 words in FIFO (2), n+2 words in FIFO (3) tPAE tPAE 1 2 1 tENS 2 tENH 4670 drw 20 NOTES: 1. n = PAE offset. 2. For IDT Standard mode 3. For FWFT mode. 4. tSKEW2 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that PAE will go HIGH (after one RCLK cycle plus tPAE). If the time between the rising edge of WCLK and the rising edge of RCLK is less than tSKEW2, then the PAE deassertion may be delayed one extra RCLK cycle. 5. PAE is asserted and updated on the rising edge of WCLK only. Figure 17. Programmable Almost-Empty Flag Timing (IDT Standard and FWFT Modes) tCLKH tCLKL WCLK tENH tENS tHF D/2 + 1 words in FIFO(1), D/2 words in FIFO(1), [ ] +1 [ (2) words in FIFO ] + 2 words in FIFO(2) D/2 words in FIFO(1), [ ] +1 words in FIFO(2) tHF RCLK tENS 4670 drw 21 NOTES: 1. For IDT Standard mode: D = maximum FIFO depth. D = 8,192 for the IDT72255LA and 16,384 for the IDT72265LA. 2. For FWFT mode: D = maximum FIFO depth. D = 8,193 for the IDT72255LA and 16,385 for the IDT72265LA. Figure 18. Half-Full Flag Timing (IDT Standard and FWFT Modes) 23 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES OPTIONAL CONFIGURATIONS IDT Standard mode, such problems can be avoided by creating composite flags, that is, ANDing EF of every FIFO, and separately ANDing FF of every FIFO. In FWFT mode, composite flags can be created by ORing OR of every FIFO, and separately ORing IR of every FIFO. Figure 23 demonstrates a width expansion using two IDT72255LA/ 72265LA devices. D0 - D17 from each device form a 36-bit wide input bus and Q0-Q17 from each device form a 36-bit wide output bus. Any word width can be attained by adding additional IDT72255LA/72265LA devices. WIDTH EXPANSION CONFIGURATION Word width may be increased simply by connecting together the control signals of multiple devices. Status flags can be detected from any one device. The exceptions are the EF and FF functions in IDT Standard mode and the IR and OR functions in FWFT mode. Because of variations in skew between RCLK and WCLK, it is possible for EF/FF deassertion and IR/OR assertion to vary by one cycle between FIFOs. In PARTIAL RESET ( ) MASTER RESET ( ) FIRST WORD FALL THROUGH/ SERIAL INPUT (FWFT/SI) RETRANSMIT ( ) Dm+1 - Dn m+n DATA IN m D0 - Dm n READ CLOCK (RCLK) WRITE CLOCK (WCLK) READ ENABLE ( WRITE ENABLE ( OUTPUT ENABLE ( LOAD ( ) FULL FLAG/INPUT READY ( / ) #1 FULL FLAG/INPUT READY ( / ) #2 IDT 72255LA 72265LA IDT 72255LA 72265LA (1) GATE PROGRAMMABLE ( HALF-FULL FLAG ( ) ) ) EMPTY FLAG/OUTPUT READY ( / ) #1 EMPTY FLAG/OUTPUT READY ( / ) #2 (1) ) ) PROGRAMMABLE ( ) FIFO #1 FIFO #2 m n Qm+1 - Qn Q0 - Qm NOTES: 1. Use an AND gate in IDT Standard mode, an OR gate in FWFT mode. 2. Do not connect any output control signals directly together. 3. FIFO #1 and FIFO #2 must be the same depth, but may be different word widths. Figure 19. Block Diagram of 8,192 x 36 and 16,384 x 36 Width Expansion 24 GATE m+n DATA OUT 4670 drw 22 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES DEPTH EXPANSION CONFIGURATION (FWFT MODE ONLY) The IDT72255LA can easily be adapted to applications requiring depths greater than 8,192 and 16,384 for the IDT72265LA with an 18-bit bus width. In FWFT mode, the FIFOs can be connected in series (the data outputs of one FIFO connected to the data inputs of the next) with no external logic necessary. The resulting configuration provides a total depth equivalent to the sum of the depths associated with each single FIFO. Figure 24 shows a depth expansion using two IDT72255LA/72265LA devices. Care should be taken to select FWFT mode during Master Reset for all FIFOs in the depth expansion configuration. The first word written to an empty configuration will pass from one FIFO to the next ("ripple down") until it finally appears at the outputs of the last FIFO in the chain–no read operation is necessary but the RCLK of each FIFO must be free-running. Each time the data word appears at the outputs of one FIFO, that device's OR line goes LOW, enabling a write to the next FIFO in line. For an empty expansion configuration, the amount of time it takes for OR of the last FIFO in the chain to go LOW (i.e. valid data to appear on the last FIFO's outputs) after a word has been written to the first FIFO is the sum of the delays for each individual FIFO: that the tSKEW3 specification is not met between WCLK and transfer clock, or RCLK and transfer clock, for the OR flag. The "ripple down" delay is only noticeable for the first word written to an empty depth expansion configuration. There will be no delay evident for subsequent words written to the configuration. The first free location created by reading from a full depth expansion configuration will "bubble up" from the last FIFO to the previous one until it finally moves into the first FIFO of the chain. Each time a free location is created in one FIFO of the chain, that FIFO's IR line goes LOW, enabling the preceding FIFO to write a word to fill it. For a full expansion configuration, the amount of time it takes for IR of the first FIFO in the chain to go LOW after a word has been read from the last FIFO is the sum of the delays for each individual FIFO: (N – 1)*(3*transfer clock) + 2 TWCLK where N is the number of FIFOs in the expansion and TWCLK is the WCLK period. Note that extra cycles should be added for the possibility that the tSKEW1 specification is not met between RCLK and transfer clock, or WCLK and transfer clock, for the IR flag. The Transfer Clock line should be tied to either WCLK or RCLK, whichever is faster. Both these actions result in data moving, as quickly as possible, to the end of the chain and free locations to the beginning of the chain. (N – 1)*(4*transfer clock) + 3*TRCLK where N is the number of FIFOs in the expansion and TRCLK is the RCLK period. Note that extra cycles should be added for the possibility FWFT/SI • WRITE CLOCK TRANSFER CLOCK FWFT/SI RCLK WCLK FWFT/SI • WCLK READ CLOCK RCLK READ ENABLE WRITE ENABLE IDT 72255LA 72265LA IDT 72255LA 72265LA INPUT READY OUTPUT READY OUTPUT ENABLE GND DATA IN n Dn Qn n n Dn DATA OUT Qn 4670 drw 23 Figure 20. Block Diagram of 16,384 x 18 and 32,768 x 18 Depth Expansion 25 ORDERING INFORMATION XXXXX Device Type X Power XX Speed X Package X X X Process / Temperature Range BLANK 8 Tray Tape and Reel BLANK I(1) Commercial (0°C to +70°C) Industrial (-40°C to +85°C) G(2) Green PF TF Thin Plastic Quad Flatpack (TQFP, PN64) Slim Thin Quad Flatpack (STQFP, PP64) 10 15 20 Commercial Only Com'l & Ind'l Com‘l & Ind’l LA Low Power 72255 72265 8,192 x 18 — SuperSync FIFO 16,384 x 18 — SuperSync FIFO Clock Cycle Time (tCLK) Speed in Nanoseconds 4670 drw24 NOTES: 1. Industrial temperature range product for 15ns and 20ns speed grades are available as a standard device. 2. Green parts are available. For specific speeds and packages contact your local sales office. LEAD FINISH (SnPb) parts are in EOL process. Product Discontinuation Notice - PDN# SP-17-02 DATASHEET DOCUMENT HISTORY 04/25/2001 10/17/2005 01/13/2009 07/15/2014 11/27/2017 pgs. 1, 5, 6 and 26. pgs. 1, 6, 20, 21 and 26. PCN#F0509-01. pg. 26. pg. 1, 2 and 26. Product Discontinuation Notice - PDN# SP-17-02 Last time buy expires June 15, 2018. 26 5 VOLT CMOS SuperSync FIFO™ 8,192 x 18 16,384 x 18 IDT72255LA IDT72265LA ADDENDUM DIFFERENCES BETWEEN THE IDT72255LA/72265LA AND IDT72255L/72265L IDT has improved the performance of the IDT72255/72265 SuperSync™ FIFOs. The new versions are designated by the “LA” mark. The LA part is pinfor-pin compatible with the original “L” version. Some difference exist between the two versions. The following table details these differences. Item NEW PART OLD PART IDT72255LA IDT72265LA IDT72255L IDT72265L Comments Pin #3 DC (Don’t Care) - There is no restriction on WCLK and RCLK. See note 1. FS (Frequency Select) In the LA part this pin must be tied to either VCC or GND and must not toggle after reset. First Word Latency (IDT Standard Mode) 60ns(2) + tREF + 1 TRCLK(4) tFWL1 = 10*Tf(3) + 2TRCLK(4)(ns) First word latency in the LA part is a fixed value, independent of the frequency of RCLK or WCLK. First Word Latency (FWFT Mode) 60ns(2) + tREF + 2 TRCLK(4) tFWL2 = 10*Tf(3) + 3TRCLK(4)(ns) First word latency in the LA part is a fixed value, independent of the frequency of RCLK or WCLK. Retransmit Latency (IDT Standard Mode) 60ns(2) + tREF + 1 TRCLK(4) tRTF1 = 14*Tf(3) + 3TRCLK(4)(ns) Retransmit latency in the LA part is a fixed value, independent of the frequency of RCLK or WCLK. 60ns(2) + tREF + 2 TRCLK(4) tRTF2 = 14*Tf(3) + 4TRCLK(4)(ns) Retransmit latency in the LA part is a fixed value, independent of the frequency of RCLK or WCLK. 80mA 180mA Active supply current 20mA 15mA Standby current 15 + 2.1*fS + 0.02*CL*fS(mA) Not Given Typical ICC1 Current calculation Retransmit Latency (FWFT Mode) I CC1 I CC2 Typical ICC1 (5) NOTES: 1. WCLK and RCLK can vary independently and can be stopped. There is no restriction on operating WCLK and RCLK. 2. This is tSKEW3. 3. Tf is the period of the ‘selected clock’. 4. TRCLK is the cycle period of the read clock. 5. Typical ICC1 is based on VCC = 5V, tA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz using TTL levels), data switching at fS/2, CL = Capacitive Load (in pF). IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc and the SuperSyncFIFO is a trademark of Integrated Device Technology, Inc. COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES 27 ©2017 Integrated Device Technology, Inc. All rights reserved. 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