H5GQ1H24AFR
1Gb (32Mx32) GDDR5 SGRAM H5GQ1H24AFR
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 1
H5GQ1H24AFR Revision History
Revision No. 0.1 0.2 0.3 0.4 0.5 0.6 Defined target spec. Updated tRTPS / tRTW / tFAW / t32AW / Thermal Characteristics Updated tCKE / Pin Cap / CRCWL / CRCRL/ IDD / PLL Value Updated tRRDL / Revision ID/ Density ID Removed tFLK / tSTDBYLK Updated tCKE / tCKSRE / tCKSRX (@ 6Gbps only) Updated Updated Updated Updated Updated Updated CRCWL / VREFD Selection Coding Auto VREFD Training tCKE & tPD Leakage Current x16 Mode IDD Value & 1.35V Timing Parameters Ordering Information History Draft Date Dec. 2008 Mar. 2009 April. 2009 May. 2009 May. 2009 July. 2009 Remark Preliminary Preliminary Preliminary Preliminary Preliminary Preliminary
0.7 1.0
VREFD Options Figure31 change Revision 1.0 Release
Sep. 2009 Nov. 2009
Preliminary
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TABLE OF CONTENTS
FEATURES........................................................................................................................................................5 FEATURES..............................................................................................................................................5 FUNCTIONAL DESCRIPTION....................................................................................................................5 DEFINITION OF SINGLE STATE TERMINOLOGY....................................................................................................7 CLOCKING..........................................................................................................................................................8 INITIALIZATION................................................................................................................................................10 POWER UP SEQUENCE...........................................................................................................................10 INITIALIZATION WITH STABLE POWER..................................................................................................11 VENDOR ID...........................................................................................................................................13 ADDRESS.........................................................................................................................................................15 ADDRESSING.........................................................................................................................................15 ADDRESS BUS INVERSION(ABI)..............................................................................................................16 BAND GROUP........................................................................................................................................18 TRAINING........................................................................................................................................................21 INTERFACE TRAINING SEQUENCE..........................................................................................................21 ADDRESS TRAINING..............................................................................................................................22 WCK2CK TRAINING...............................................................................................................................25 READ TRAINING...................................................................................................................................32 WRITE TRAINING.................................................................................................................................38 MODE REGISTER..............................................................................................................................................41 Mode REGISTER 0(MR0).......................................................................................................................42 Mode REGISTER 1(MR1).......................................................................................................................45 Mode REGISTER 2(MR2).......................................................................................................................48 Mode REGISTER 3(MR3).......................................................................................................................50 Mode REGISTER 4(MR4).......................................................................................................................52 Mode REGISTER 5(MR5).......................................................................................................................55 Mode REGISTER 6(MR6).......................................................................................................................57 Mode REGISTER 7(MR7).......................................................................................................................60 Mode REGISTER 15(MR15)....................................................................................................................62 OPERATION......................................................................................................................................................63 COMMAND.............................................................................................................................................63 DESELECT.............................................................................................................................................65 NO OPERATION.....................................................................................................................................65 MODE REGISTER SET.............................................................................................................................65 ACTIVATION..........................................................................................................................................66 BANK RESTRITIONS...............................................................................................................................68 WRITE (WOM).......................................................................................................................................70 WRITE DATA MAS(DM)...........................................................................................................................89
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READ....................................................................................................................................................86 DQ PREAMBLE .....................................................................................................................................95 READ AND WRITE DATA BUS INVERSION (DBI).......................................................................................97 ERROR DETECTION CODE.....................................................................................................................99 PRECHARGE........................................................................................................................................103 AUTO PRECHARGE...............................................................................................................................104 REFRESH.............................................................................................................................................104 SELF REFRESH....................................................................................................................................106 POWER-DOWN....................................................................................................................................109 COMMAND TRUTH TABLE.....................................................................................................................110 RDQS MODE........................................................................................................................................114 CLOCK FREQUENCY CHANGE SEQUENCE..............................................................................................116 DYNAMIC VOLTAGE SWITCHING(DVS).................................................................................................117 TEMPERATURE SENSOR.......................................................................................................................119 DUTY CYCLE CORRECTOR....................................................................................................................120 OPERATING CONDITIONS................................................................................................................................122 Absolute Maximum Ratings...................................................................................................................122 AC & DC Characteristics........................................................................................................................124 CLOCK TO DATA TIMING SENSITIVITY..................................................................................................148 PACKAGE SPECIFICATION................................................................................................................................151 BALL-OUT...............................................................................................................................................151 SIGNALS.................................................................................................................................................153 ON DIE TERMINATION(ODT)....................................................................................................................156 PACKAGE DIMENSIONS...........................................................................................................................157 MIRROR FUNCTION(MF) ENABLE AND X16 MODE ENABLE.................................................................................158 BOUNDARY SCAN............................................................................................................................................163
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 4
H5GQ1H24AFR
FEATURES
• Single ended interface for data, address and command • Quarter data‐rate differential clock inputs CK/CK# for ADR/CMD • Two half data‐rate differential clock inputs WCK/ WCK#, each associated with two data bytes (DQ, DBI#, EDC) • Double Data Rate (DDR) data (WCK) • Single Data Rate (SDR) command (CK) • Double Data Rate (DDR) addressing (CK) • 16 internal banks • 4 bank groups for tCCDL = 3 tCK • 8n prefetch architecture: 256 bit per array read or write access • Burst length: 8 only • Programmable CAS latency: 5 to 20 tCK • Programmable WRITE latency: 1 to 7 tCK • WRITE Data mask function via address bus (single/ double byte mask) • Data bus inversion (DBI) & address bus inversion (ABI) • Input/output PLL on/off mode • Address training: address input monitoring by DQ pins • WCK2CK clock training with phase information by EDC pins • Data read and write training via READ FIFO • READ FIFO pattern preload by LDFF command • Direct write data load to READ FIFO by WRTR command • Consecutive read of READ FIFO by RDTR command • Read/Write data transmission integrity secured by cyclic redundancy check (CRC‐8) • READ/WRITE EDC on/off mode • Programmable EDC hold pattern for CDR • Programmable CRC READ latency = 0 to 3 tCK • Programmable CRC WRITE latency = 7 to 14 tCK • Low Power modes • RDQS mode on EDC pin • Optional on‐chip temperature sensor with read‐out • Auto & self refresh modes • Auto precharge option for each burst access • 32ms, auto refresh (8k cycles) • Temperature sensor controlled self refresh rate • On‐die termination (ODT); nominal values of 60 ohm and 120 ohm • Pseudo open drain (POD‐15) compatible outputs (40 ohm pulldown, 60 ohm pullup) • ODT and output drive strength auto‐calibration with external resistor ZQ pin (120 ohm) • Programmable termination and driver strength offsets • Selectable external or internal VREF for data inputs; programmable offsets for internal VREF • Separate external VREF for address / command inputs • Vendor ID, FIFO depth and Density info fields for identification • x32/x16 mode configuration set at power‐up with EDC pin • Mirror function with MF pin • Boundary scan function with SEN pin • 1.6V / 1.5V +/‐ 0.045V supply for device operation (VDD) • 1.6V / 1.5V +/‐ 0.045V supply for I/O interface (VDDQ) • 170 ball BGA package
Rev. 1.0/Nov. 2009
FUNCTIONAL DESCRIPTION
The GDDR5 SGRAM is a high speed dynamic random‐access memory designed for applications requiring high bandwidth. GDDR5 devices contain the following number of bits: 1 Gb has 1,073,741,824 bits and sixteen banks The GDDR5 SGRAM uses a 8n prefetch architecture and DDR interface to achieve high‐ speed operation. The device can be configured to operate in x32 mode or x16 (clamshell) mode. The mode is detected during device initialization. The GDDR5 interface transfers two 32 bit wide data words per WCK clock cycle to/from the I/O pins. Corresponding to the 8n‐prefetch a single write or read access consists of a 256 bit wide, two CK clock cycle data transfer at the internal memory core and eight corresponding 32 bit wide one‐half WCK clock cycle data transfers at the I/O pins. The GDDR5 SGRAM operates from a differential clock CK and CK#. Commands are registered at every rising edge of CK. Addresses are registered at every rising edge of CK and every rising edge of CK#. GDDR5 replaces the pulsed strobes (WDQS & RDQS) used in previous DRAMs such as GDDR4 with a free running differential forwarded clock (WCK/WCK#) with both input and output data registered and driven respectively at both edges of the forwarded WCK. Read and write accesses to the GDDR5 SGRAM are burst oriented; an access starts at a selected location and consists of a total of eight data words. Accesses begin with the registration of an ACTIVE command, which is then followed by a READ or WRITE command. The address bits registered coincident with the ACTIVE command and the next rising CK# edge are used to select the bank and the row to be accessed. The address bits registered coincident with the READ or WRITE command and the next rising CK# edge are used to select the bank and the column location for the burst access.
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ORDERING INFORMATION
Part No H5GQ1H24AFR-R0C H5GQ1H24AFR-T3C H5GQ1H24AFR-T2L (Note1) H5GQ1H24AFR-T2C H5GQ1H24AFR-T1C H5GQ1H24AFR-T0C VDD/VDDQ = 1.5V Power Supply VDD/VDDQ = 1.6V CK Frequency WCK Frequency Max Data Rate 1.50GHz 1.375GHz 1.25GHz 1.25GHz 1.125GHz 1.00GHz 3.00GHz 2.75GHz 2.50GHz 2.50GHz 2.25GHz 2.00GHz 6.0Gbps/pin 5.5Gbps/pin 5.0Gbps/pin 5.0Gbps/pin 4.5Gbps/pin 4.0Gbps/pin POD_15 Interface
Above Hynix P/N’s are Leead-free, RoHS Compliant and Halogen-free. Note.1)It supports not only 5Gbps @ 1.5V, but also 3.2Gbps @ 1.35V.
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0.1. DEFINITION OF SIGNAL STATE TERMINOLOGY
GDDR5 SGRAM will be operated in both ODT Enable (terminated) and ODT Disable (unterminated) modes. For highest data rates it is recommended to operate in the ODT Enable mode. ODT Disable mode is designed to reduce power and may operate at reduced data rates. There exist situations where ODT Enable mode can not be guaranteed for a short period of time, i.e. during power up. Following are four terminologies defined for the state of a device (GDDR5 SGRAM or controller) pin dur‐ ing operation. The state of the bus will be determined by the combination of the device pins connected to the bus in the system. For example in GDDR5 it is possible for the SGRAM pin to be tristated while the controller pin is High or ODT. In both cases the bus would be High if the ODT is enabled. For details on the GDDR5 SGRAM pins and their function see “PACKAGE SPECIFICATION” on page 156 and “SIG‐ NALS” on page 158 in the section entitled “PACKAGE SPECIFICATION” on page 156.
Device pin signal level:
• High: A device pin is driving the Logic “1” state. • Low: A device pin is driving the Logic “0” state. • Hi‐Z: A device pin is tristate. • ODT: A device pin terminates with ODT setting, which could be terminating or tristate depending on Mode Register setting.
Bus signal level:
• High: One device on bus is High and all other devices on bus are either ODT or Hi‐Z. The voltage level on the bus would be nominally VDDQ • Low: One device on bus is Low and all other devices on bus are either ODT or Hi‐Z. The voltage level on the bus would be nominally VOL(DC) if ODT was enabled, or VSSQ if Hi‐Z. • Hi‐Z: All devices on bus are Hi‐Z. The voltage level on bus is undefined as the bus is floating. • ODT: At least one device on bus is ODT and all others are Hi‐Z. The voltage level on the bus would be nominally VDDQ.
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0.2. CLOCKING
The GDDR5 SGRAM operates from a differential clock CK and CK#. Commands are registered at every rising edge of CK. Addresses are registered at every rising edge of CK and every rising edge of CK#. GDDR5 uses a DDR data interface and an 8n‐prefetch architecture. The data interface uses two differen‐ tial forwarded clocks (WCK/WCK#). DDR means that the data is registered at every rising edge of WCK and rising edge of WCK#. WCK and WCK# are continuously running and operate at twice the frequency of the command/address clock (CK/CK#).
CK# CK
COMMAND
ADDRESS
WCK# WCK DQ*1
Figure 1: GDDR5 Clocking and Interface Relationship
Note : Figure.1 shows the relationship between the data rate of the buses and the clocks and is not a timing diagram.
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 8
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.
Controller
ADD/CMD centered with CK/CK# CMD/ADD
D Q
GDDR5 SGRAM
CMD sampled by CK/CK# as SDR ADD sampled by CK/CK# as DDR
D Q QB
CMD/ADD
DRAM core
CK/CK# (1GHz) Oscillator PLL
WCK2CK Alignment
Data Tx/Rx
D
Q
PLL
/2
WCK/WCK# (2GHz) To EDC pin WCKint (1GHz) early/late Clock Phase Controller Phase detector/ Phase accumulator corelogic early/late from calibration data DQ [0]‐[7] (4Gbps)
Q
D
Q
D
Receiver clock Clock Phase Controller
DQ
D D Q
Q
DRAM core
For 8 data bits
Figure 2: Block Diagram of an example clock system
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 9
H5GQ1H24AFR 1. INITIALIZATION
1.1. POWER‐UP SEQUENCE
GDDR5 SGRAMs must be powered up and initialized in a predefined manner as shown in Figure . Operational procedures other than those specified may result in undefined operation. The Mode Registers do not have RESET default values, except for ABI#, ADR/CMD termination, and the EDC hold pattern. If the mode registers are not set during the initialization sequence, it may lead to unspecified operation.
Step 1 2 3 4 5 6 7 Apply power to VDD Apply power to VDDQ at same time or after power is applied to VDD Apply VREFC and VREFD at same time or after power is applied to VDDQ After power is stable, provide stable clock signals CK/CK# Assert and hold RESET# low to ensure all drivers are in Hi‐Z and all active terminations are off. Assert and hold NOP command. Wait a minimum of 200μs. If boundary scan mode is necessary, SEN can be asserted HIGH to enter boundary scan mode. Boundary scan mode must be entered directly after power‐up while RESET# is low. Once boundary scan is executed, power‐up sequence should be followed. Set CKE# for the desired ADR/CMD ODT settings, then bring RESET# High to latch in the logic state of CKE#, tATS and tATH must be met during this procedure. See Table 1 for the values and logic states for CKE#. The rising edge of RESET# will determine x32 mode or x16 mode depending on the state of EDC1(EDC2 when MF=1). In normal x32 mode, EDC1 has to be sustained HIGH until RESET# is HIGH. See Table for the values and logic states for EDC1(EDC2 when MF=1). Bring CKE# Low after tATH is satisfied Wait at least 200μs referenced from the beginning of tATS Issue at least 2 NOP commands Issue a PRECHARGE ALL command followed by NOP commands until tRP is satisfied Issue MRS command to MR15. Set GDDR5 SGRAM into address training mode (optional) Complete address training (optional) Issue MRS command to read the Vendor ID Issue MRS command to set WCK01/WCK01# and WCK23/WCK23# termination values Provide stable clock signals WCK01/WCK01# and WCK23/WCK23# Issue MRS commands to use PLL or not and select the position of a WCK/CK phase detector. The use of PLL and the position of a phase detector should be issued before WCK2CK training. Issue MRS commands including PLL reset to the mode registers in any order. tMRD must be met during this procedure. WLmrs, CLmrs, CRCWL and CRCRL must be programmed before WCK2CK training. Issue two REFRESH commands followed by NOP until tRFC is satisfied After any necessary GDDR5 training sequences such as WCK2CK training, READ training (LDFF, RDTR) and WRITE training (WRTR, RDTR), the device is ready for operation.
8
9 10 11 12 13 14 15 16 17
18
19 20
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 10
H5GQ1H24AFR
Table 1 Address and Command Termination
VALUE (OHMS) ZQ/2 ZQ CKE# at RESET# high transition Low High
VDD VDDQ VREFD/C
(( ))
(( )) (( ))
(( ))
(( ))
(( ))
(( ))
(( ))
(( ))
tATS tATH
(( ))
RESET#
(( ))
(( ))
CKE# CK# CK CMD
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( ))
NOP
NOP( (
NOP
NOP
PRE
NOP
TRAIN / MRS ((
)) (( ))
A.C.
A.C.
ADR DQ, DBI# EDC
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
TRAIN / MRS ((
)) (( ))
ADR
ADR ADR ADR (( ((
)) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
TRAIN / MRS ((
)) (( )) ))
TRAIN / MRS ((
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
EDC WCK# WCK
x32 x16
(( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( ))
TRAIN / MRS ((
)) (( )) (( ))
All Banks Precharge min. 200 μs Voltages and CK stable Note: A.C. = Any Command min. 200 μs tRP
Execution of steps 13‐21 in Power‐up sequence
Figure 3: GDDR5 SGRAM Power‐up Initialization
1.2. Initialization with Stable Power The following sequence is required for reset subsequent to power‐up initialization. This requires that the power has been stable within the specified VDD and VDDQ ranges since power‐up initialization (See
Figure 4)
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 11
H5GQ1H24AFR
1) Assert RESET# Low anytime when reset is needed. 2) Hold RESET# Low for minimum 100ns. Assert and hold NOP command. 3) Set CKE# for the desired ADR/CMD ODT settings, then bring RESET# High to latch in the logic state of CKE#; tATS and tATH must be met during this procedure. Keep EDC1 (MF=0) / EDC2 (MF=1) at the same logic level as during power‐up initialization as device functionality is not guaranteed if the I/O width has changed. 4) Continue with step 9 of the power‐up initialization sequence.
VDD, VDDQ VREFD/C
(( ))
(( ))
(( ))
(( ))
(( ))
(( ))
tATS tATH
(( ))
RESET#
(( ))
(( ))
CKE# CK# CK CMD
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( (( )) )) (( )) (( )) (( ))
(( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( ))
NOP
NOP( (
NOP
NOP
PRE
NOP
TRAIN / MRS ((
)) (( ))
A.C.
A.C.
ADR DQ, DBI# EDC WCK# WCK
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
TRAIN / MRS ((
)) (( ))
ADR
ADR ADR ADR (( ((
)) (( )) (( )) (( )) (( )) (( )) (( )) )) (( )) (( )) (( )) (( )) (( )) (( ))
TRAIN / MRS ((
)) (( )) )) (( )) (( ))
TRAIN / MRS ((
All Banks Precharge min. 100 ns min. 200 μs tRP
Execution of steps 13‐21 in Power‐up sequence
Notes: 1. A.C. = Any Command 2. Device functionality is not guaranteed if x32/x16 mode is not the same as during power‐up initialization.
Figure 4: Initialization with Stable Power
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1.2. VENDOR ID
GDDR5 SGRAMs are required to include a Vendor ID feature that allows the controller to receive informa‐ tion from the GDDR5 SGRAM to differentiate between different vendors and different devices using a software algorithm. When the Vendor ID function is enabled the GDDR5 SGRAM will provide its Manufacturers Vendor Code on bits [3:0] as shown in Table 2; Revision Identification on bits [7:4]; Density on bits [9:8] ; FIFO Depth on bits [11:10] as shown in Table 3 & Table4. Bits [15:12] are RFU. Vendor ID is part of the INFO field of Mode Register 3 (MR3) and is selected by issuing a MODE REGIS‐ TER SET command with MR3 bit A6 set to 1, and bit A7 set to 0. MR3 bits A0‐A5 and A8‐A11 are set to the desired values. The Vendor ID will be driven onto the DQ bus after the MRS command that sets bits A6 to 1 and A7 to 0. The DQ bus will be continuously driven until an MRS command sets MR3 A6 and A7 back to 0 to disable the INFO field or to another valid state for the INFO field if the INFO field includes support for additional vendor specific information. The DQ bus will be in ODT state after tWRIDOFF (max). The code can be sam‐ pled by the controller after waiting tWRIDON (max) and before tWRIDOFF (min). DBI is not enabled or ignored during all Vendor ID operations. Table 4 shows the mapping of the Vendor ID info to the physical DQs. The 16 bits of Vendor ID are sent on Byte 0 and 2 when MF=0. When MF=1 the 16 bits are sent on Byte 1 and 3. Optionally the vendor may replicate the data on the other 2 bytes when in x32 mode. Byte 0 would be replicated on Byte 1 and Byte 2 would be replicated on Byte 3 when MF=0. When MF=1, Byte 1 would be replicated on Byte 0 and Byte 3 would be replicated on Byte 2. TABLE 2. Manufacturers Vendor Code
Manufacturers ID 0 1 2 3 4 5 6 7 8 9 A B C D E F Bit 3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Name of Company Reserved Samsung Qimonda Elpida Etron Nanya Hynix ProMOS Winbond ESMT Reserved Reserved Reserved Reserved Reserved Micron
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Table 3 Revision ID & Density & FIFO Depth
Revision ID Bit 7 0 Bit 6 0 Bit 6 0 Bit 4 1 Bit 9 0 Density Bit 8 1 Bit 11 1 FIFO Bit 10 0
Table 4 Vendor ID to DQ mapping
Bit MF=0 MF=1 Feature Bit MF=0 MF=1 Feature 15 DQ23 DQ15 7 DQ7 DQ31 6 DQ6 DQ30 5 DQ5 DQ29 4 DQ4 DQ28 3 DQ3 DQ27 2 DQ2 DQ26 1 DQ1 DQ25 0 DQ0 DQ24
Revision Identification 14 DQ22 DQ14 RFU 13 DQ21 DQ13 12 DQ20 DQ12 11 DQ19 DQ11
Manufacturers Vendor Code 10 DQ18 DQ10 9 DQ17 DQ9 Density 8 DQ16 DQ8
FIFO Depth
CK# CK CMD BA0‐BA3 A2‐A5 A8 A7 A11 A6 A9,A10 A0,A1 NOP MRS
MRA Code
NOP
NOP
NOP
NOP
MRS
MRA Code
NOP
NOP
NOP
NOP
Code
Code
Code
Code
Code Code
Code Code
tWRIDON(max) DQ Vendor ID + Rev Code
tWRIDOFF(min)
MRA = Mode Register Address; Code = Opcode to be loaded
Donʹt Care
Figure 5: Vendor ID Timing Diagram
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H5GQ1H24AFR 2. ADDRESS
2.1. ADDRESSING
GDDR5 SGRAMs use a double data rate address scheme to reduce pins required on the GDDR5 SGRAM as shown in Table 5. The addresses should be provided to the GDDR5 SGRAM in two parts; the first half is latched on the rising edge of CK along with the command pins such as RAS#, CAS# and WE#; the second half is latched on the next rising edge of CK#. The use of DDR addressing allows all address values to be latched in at the same rate as the SDR com‐ mands. All addresses related to command access have been positioned for latching on the initial rising edge for faster decoding.
Table 5 Address Pairs
Clock Rising CK Rising CK# BA3 A3 BA2 A4 BA1 A5 BA0 A2 (A12) (RFU) A11 A6 A10 A0 A9 A1 A8 A7
Note: Address pin A12 is required only for 2G density.
GDDR5 addressing includes support for 1G density. For all densities two modes are supported (x32 mode or x16 mode). x32 and x16 modes differ only in the number of valid column addresses, as shown in Table6.
Table 6 Addressing Scheme
1G x32 mode Row address Column address Bank address Autoprecharge Page Size Refresh Refresh period A0~A11 A0~A5 BA0~BA3 A8 2K 8K/32ms 3.9us x16 mode A0~A11 A0~A6 BA0~BA3 A8 2K 8K/32ms 3.9us
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2.2. ADDRESS BUS INVERSION (ABI)
Address Bus Inversion (ABI) reduces the power requirements on address pins, as the no. of address lines driving a low level can be limited to 4 (in case A12/RFU is not wired) or 5 (in case A12/RFU is wired). The Address Bus Inversion function is associated with the electrical signalling on the address lines between a controller and the GDDR5 SGRAM, regardless of whether the information conveyed on the address lines is a row or column address, a mode register op‐code, a data mask, or any other pattern. The ABI# input is an active Low double data rate (DDR) signal and sampled by the GDDR5 SGRAM at the rising edge of CK and the rising edge of CK# along with the address inputs. Once enabled by the corresponding ABI Mode Register bit, the GDDR5 SGRAM will invert the pattern received on the address inputs in case ABI# was sampled Low, or leave the pattern non‐inverted in case ABI# was sampled High, as shown in Figure 6.
Address Pins ABI# 8 (9) 8 (9) to DRAM core
from Mode Register: 0 = enabled 1 = disabled
Note: bus width is 8 when A12/RFU pin is not present, and 9 when A12/RFU pin is present
Figure 6: Example of Address Bus Inversion Logic
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The flow diagram in Figure 7 illustrates the ABI operation. The controller decides whether to invert or not invert the data conveyed on the address lines. The GDDR5 SGRAM has to perform the reverse operation based on the level of the ABI# pin. Address input timing parameters are only valid with ABI being enabled and a maximum of 4 address inputs driven Low.
Controller
Data to be sent on address lines Determine ’0’ count
No
’0’ count > 4 ?
Yes
ABI# = ’H’ Don’t invert
ABI# = ’L’ Invert
ABI# = ’H’ Don’t invert
ABI# = ’L’ Invert
GDDR5 SGRAM
Data received on address lines
Figure 7: Address Bus Inversion (ABI) Flow Diagram
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2.3. BANK GROUPS
For GDDR5 SGRAM devices operating at frequencies above a certain threshold, the activity within a bank group must be restricted to ensure proper operation of the device. The 8 or 16 banks in GDDR5 SGRAMs are divided into four bank groups. The bank groups feature is controlled by bits A10 and A11 in Mode Register 3 (MR3). The assignment of the banks to the bank groups is shown in Table 7.
Table 7 Bank Groups
Bank 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Addressing BA3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 BA2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 BA1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 BA0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Group D Group C Group B Group A 1G 16 banks
These bank groups allow the specification of different command delay parameters depending on whether back‐to‐back accesses are to banks within one bank group or across bank groups as shown in Table 8.
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H5GQ1H24AFR
Table 8 Command Sequences Affected by Bank Groups
Corresponding AC Timing Parameter Command Sequence Bank Groups Disabled tRRDS tCCDS tCCDS tWTRS tRTPS Bank Groups Enabled Accesses to different bank Accesses within the same groups bank group tRRDS tCCDS tCCDS tWTRS 1 tck tRRDL tCCDL tCCDL tWTRL tRTPL 1 Notes
ACTIVE to ACTIVE WRITE to WRITE READ to READ Internal WRITE to READ READ to PRECHARGE
Note.1 : Parameters tRTPS and tRTPL apply only when READ and PRECHARGE go to the same bank; use tRTPS when BG are disabled, and tRTPL when BG are enabled.
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Back-to-back column accesses based on tCCDL and tCCDS parameters.
Example 1 (Bank Groups disabled): tCCDS = 2 * tCK
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13
CLK
CAS A0 DQ A0
A1 A1
B0 B0
B1 B1
C0 C0
C1 C1
D0 D0
Example 2: (Bank Groups enabled): tCCDL = 4 * tCK
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13
CLK
CAS A0 DQ A0
A1 A1
A2 A2
A3 A3
Example 3: (Bank Groups enabled): tCCDS = 2 * tCK
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13
CLK
CAS A0 DQ A0
B0 B0
A1 A1
B1 B1
C0 C0
D0 D0
C1 C1
Notes: 1) Column accesses are to open banks, and tRCD has been met. 2) CL = 0 assumed 3) Ax, Bx, Cx, Dx: accesses to bank groups A, B, C or D, respectively 4) With bank groups enabled, tCCDL is 3tCK, as programmed in MR3.
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H5GQ1H24AFR 3. TRAINING
3.1. INTERFACE TRAINING SEQUENCE
Due to the high data rates of GDDR5, it is recommended that the interfaces be trained to operate with the optimal timings. GDDR5 SGRAM has features defined which allow for complete and efficient training of the I/O interface without the use of the GDDR5 SGRAM array. The interface trainings are required for nor‐ mal DRAM functionality unless running in lower frequency modes as described in the low frequency sec‐ tion. Interface timings will only be guaranteed after all required trainings have been executed. A recommended order of training sequences has been chosen based on the following criteria: The address training must be done first to allow full access to the Mode Registers. (MRS for address train‐ ing is a special single data rate mode register set guaranteed to work without training). Address input tim‐ ing shall function without training as long as tAS/H are met at the GDDR5 SGRAM. WCK2CK training should be done before read training because a shift in WCK relative CK will cause a shift in all READ timings relative to CK. READ training should be done before WRITE training because optimal WRITE training depends on cor‐ rect READ data.
Initialization
Address Training (optional)
WCK2CK Alignment Training
READ Training
WRITE Training
Start Normal Operation
Figure 8: Interface Training Sequence
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3.2. ADDRESS TRAINING
The GDDR5 SGRAM provides means for address bus interface training. The controller may use the address training mode to improve the timing margins on the address bus. Address training mode is entered and exited via the ADT bit in Mode Register 15 (MR15). Mode Register 15 supports the same setup and hold times on the address pins as for commands to allow a safe entry into address training mode. Address training mode uses an internal bridge between the GDDR5 SGRAM’s address inputs and DQ/ DBI# outputs. It also uses a special READ command for address capture that is encoded using the SDR command pins only (CS#,RAS#,CAS#,WE# = L,H,L,H). The address values normally used to encode the commands will not be interpreted. Once the address training mode has been entered, the address values registered coincident with this special READ command will be transmitted to the controller on the DQ/ DBI# pins. The controller is then expected to compare the address pattern received to the expected value and to adjust the address transmit timing accordingly. The procedure may be repeated using different address pattern and interface timings. No WCK clock is required for this special READ command operation during address training mode. The latched addresses are driven out asynchronously. The only commands allowed during address training mode are this special READ, MRS (e.g. to exit address training mode) and NOP / DESELECT. When enabled by the ABI bit in Mode Register 1, address bus inversion (ABI) is effective during address training mode. It is suggested to train the ABI# pin’s interface timing together with the other address lines. The timing diagram in Figure 9 illustrates the typical command sequence in address training mode. The DQ/DBI# output drivers are enabled as long as the ADT bit is set. The minimum spacing between consec‐ utive special READ commands is 2 tCK.
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CK# CK CMD MRS NOP READ (*) NOP READ (*) NOP READ (*) NOP MRS NOP NOP NOP NOP
ADDR
MR15 A10=1
ADRx ADRx R# R
ADRy ADRy R R#
ADRz ADRz R R#
MR15 A10=0
tMRD tADR Even DQ Odd DQ
tADR tADR
tADZ
ADRx R ADRx R#
ADRy R ADRy R#
ADRz R ADRz R#
Notes: 1) READ command encoding: CS# = L, RAS# = H, CAS# = L, WE# = H 2) ADRxR = 1st half of address x, sampled on rising edge of CK; ADRxR# = 2nd half of address x, sampled on rising edge of CK# 3) Addresses sampled on rising edge of CK are returned on even DQ after tADR; addresses sampled on rising edge of CK# are returned on odd DQ simultaneously with even DQ 4) DQs are enabled when ADT bit in Mode Register 15 set to 1 (Enter Address Training Mode) DQs are disabled after tADZ when ADT bit in Mode Register 15 set to 0 (Exit Address Training Mode)
Donʹt Care
Figure 9: Address Training Timing Table 9 AC timings in Address Training Mode
Parameter READ command to data out delay ADT off to DQ/DBI# in ODT state delay Symbol tADR tADZ Min 0.5*tCK+0 ‐‐ Max 0.5*tCK+10 0.5*tCK+10 Unit ns ns
Table 10 defines the correspondence between address bits and DQ/DBI#. Devices configured to x16 mode reflect the address on the two bytes being enabled in that mode, which are bytes 0 and 2 for MF=0 and bytes 1 and 3 for MF=1 configurations. Devices configured to x32 mode reflect the address on the same DQ as in x16 mode; in addition they are allowed but not required to reflect the address on those bytes that are disabled in x16 mode, thus reflecting each address twice. Devices not supporting an A12/RFU pin shall drive a logic High on the DBI# pins.
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Table 10 Address to DQ Mapping in Address Training Mode
Output DQ Address bits registered at rising edge of CK A12 DBI0# DBI1# A8 DQ22 DQ30 A11 DQ20 DQ28 BA1 DQ18 DQ26 BA2 DQ16 DQ24 BA3 DQ6 DQ14 BA0 DQ4 DQ12 A9 DQ2 DQ10 A10 DQ0 DQ8
Output DQ
Address bits registered at rising edge of CK# RFU DBI2# DBI3# A7 DQ23 DQ31 A6 DQ21 DQ29 A5 DQ19 DQ27 A4 DQ17 DQ25 A3 DQ7 DQ15 A2 DQ5 DQ13 A1 DQ3 DQ11 A0 DQ1 DQ9
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3.3. WCK2CK TRAINING
The purpose of WCK2CK training is to align the data WCK clock with the command CK clock to aid in the GDDR5 SGRAM’s internal data synchronization between the logic clocked by CK/CK# and WCK/WCK#. This will help to define both Read and Write latencies between the GDDR5 SGRAM and memory control‐ ler. WCK2CK training mode is controlled via MRS.
Before starting WCK2CK training, the following conditions must be met:
• CK/CK# clock is stable and toggling • The timing of all address and command pins must be guaranteed • PLL on/off(MR1 bit A7) and PLL delay compensation enable(MR7 bit A2) are set to desired mode before WCK to CK training is started • The desired WCK2CK alignment point (MR6, bit A0) is selected • The EDC hold pattern (MR4, bits A0‐A3) must be programmed to ‘1111’ • 2 Mode Register bits for internal WCK01 and WCK23 inversion (MR3, bits A2‐A3) must be set to a known state • All banks are idle and no other command execution is in progress
WCK2CK training must be done after any of the following conditions:
• Device initialization • Any CLmrs, WLmrs, CRCRL or CRCWL latency change • CK and WCK frequency changes • PLL on/off(MR1 bit A7) and PLL delay compensation mode(MR7 bit A2) changes • Change of the WCK2CK alignment point (MR6, bit A0) • WCK state change from off to toggling, including self refresh exit or exit from power‐down when bit A1 (LP2) in MR5 is set
Figure 10 and Figure 11 show example WCK2CK training sequences. WCK2CK training is entered via MRS by setting bit A4 in MR3. This will initiate the WCK divide‐by‐2 circuits associated with WCK01 and WCK23 clocks in the GDDR5 SGRAM. In case the divide‐by‐2 circuits are at opposite output phases, which is indicated by opposite “early/late” phases on the EDC pins associated with WCK01 and WCK23 (see below), they may be put in phase by using the WCK01 and WCK23 inversion bits. Alternatively, the WCK clocks may be put into a stable inactive state for this initialization event to aid in resetting all divid‐ ers to the same output phase as shown in Figure 11. The challenge of this method is to restart the WCK clocks in a way that even their first clock edges meet the WCK clock input specification. Otherwise, divide‐by‐2 circuits for both WCK01 and WCK23 might again have opposite phase alignment. Figure 12 illustrates how the WCK phase information is derived. The phase detectors (PD) sample the internally divided‐by‐2 WCK clocks. Only one sample point is shown in the figure for clarity. In reality, when WCK2CK training mode is enabled, a sample will occur every tCK and will be translated to the EDC pins accordingly. If the divided‐by‐2 WCK clock arrives early, then the EDC pin outputs the EDC hold pattern during the time interval specified in Figure 12. If the divided‐by‐2 WCK clock arrives late, then the EDC pin outputs the inverted EDC hold pattern during the time interval specified in Figure 12. This is shown in Table 11.
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CK CK# CMD WCK WCK# tLK Enter WCK2CK Training Start WCK2CK Phase Search PLL Reset (PLL on only) tMRD Exit WCK2CK Training (sets data synchronizers, rests FIFO pointers) NOP NOP MRS NOP NOP NOP NOP MRS MRS A.C.
Figure 10: Example WCK2CK Training Sequence
CK# CK CMD WCK WCK# tWCK2MRS tMRSTWCK tWCK2TR tLK tMRD NOP MRS NOP NOP NOP NOP NOP NOP MRS MRS Valid
Enter WCK2CK Training by MRS (resets WCK divide‐ by‐2 circuits)
WCK Restart
Start WCK2CK Phase Search
PLL Reset (PLL on only)
Exit WCK2CK Training by MRS (Set data synchronizers, resets FIFO pointers)
Figure 11: Example WCK2CK Training Sequence with WCK Stopping
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CK 1 WCK01/2 WCK23/2 (internal) 1 Early EDC0 EDC2
‐ tWCK2CK
WCK Early
x
x
x
x
x
x
x
~ ~
x
1 1 1 1 tWCKTPH
x
x
x
x
x
x
x
WCK01/2 WCK23/2 (internal) 2 Late EDC0 EDC2
0 + tWCK2CK WCK Late
x
x
x
x
x
x
x
~ ~
x
0 0 0 0 tWCKTPH
x
x
x
x
x
x
x
WCK01/2 WCK23/2 (internal) 3 Aligned EDC0 EDC2
x
x
x
x
x
x
x
~ ~
x
x
x
x
x
x
x
x
x
x
x
x
tWCKTPH
Figure 12: EDC pin Behaviour for WCK2CK Training (assumes ‘1111’ as EDC Hold Pattern)
Table 11 Phase Detector and EDC Pin behavior
WCK/2 value sampled by CK ‘1’ ‘0’ WCK2CK Phase ‘Early’ ‘Late’ Data on EDC Pin EDC hold (‘1111’) Inverted EDC Hold (‘0000’) Action Increase Delay on WCK Decrease Delay on WCK
The ideal alignment is indicated by the phase detector output transitioning from “early” to “late” when the delay of the WCK phase is continuously increased. The WCK phase range for ideal alignment is speci‐ fied by the parameter tWCK2CKPIN ; the value(s) vary with the PLL mode (on or off) and the selected align‐ ment point. If enabled, the PLL shall not interfere in the behavior of the WCK2CK training. Significantly moving the phase and/or stopping the WCK during training may disturb the PLL. It is required to perform a PLL reset after the WCK2CK training has determined and selected the proper alignment between WCK and CK clocks. The PLL lock time tLK must be met before exiting WCK2CK training to guarantee that the PLL is in lock such that the GDDR5 SGRAM data synchronizers are set upon WCK2CK training exit. WCK2CK training is exited via MRS by resetting bit A4 in MR3. For proper reset of the data synchronizers it is required that the WCK and CK clocks are aligned within tWCK2CKSYNC at the time of the WCK2CK training exit.
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After exiting WCK2CK training mode, the WCK phase is allowed to further drift from the ideal alignment point by a maximum of tWCK2CK (e.g. due to voltage and temperature variation). Once this WCK phase drift exceeds tWCK2CK(min) or tWCK2CK(max), it is required to repeat the WCK2CK training and realign the clocks.
WCK2CK alignment at PIN Mode The WCK and CK phase alignment point can be changed via MRS by setting bit A0 in MR6. In normal mode, when MR6 A0 is set to ‘0’, the phases of CK and WCK are aligned at CK pins and the end of WCK tree as shown in Figure 13. On the other hand, when MR6 A0 is set to ‘1’, the phases of CK and WCK are aligned at the pin as shown in Figure 14. PIN mode is supported up to the max CK clock frequency of fCKPIN, and is an option to reduce the time of WCK2CK training at low frequency.
WCK WCK# CK CK# EDC
D CK
Q Internal WCK/2
Phase Detector
Internal CK
Figure 13: Normal Mode
WCK WCK# CK CK# EDC
D CK
Q Internal WCK/2
Phase Detector
Internal CK
Figure 14: Pin Mode
WCK2CK Auto Synchronization GDDR5 SGRAMs support a WCK2CK automatic synchronization mode that eliminates the need for WCK2CK training upon power‐down exit. This mode is controlled by the autosync bit (MR7, bit A4), and is effective when the LP2 bit (MR5, bit A1) is set and the WCK clocks are stopped during power‐down.
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Also, this mode works for both normal and PIN mode. When WCK2CK automatic synchronization mode is enabled, a full WCK2CK training including Phase search is not required after power‐down exit, although WCK2CK MRS must be issued momentarily for setting the data synchronizers. However, WCK and CK clocks must meet the tWCK2CKSYNC specification upon power‐down exit. Any allowed command may be issued after tXPN or after tLK in case the PLL had been enabled upon power‐down entry. The PLL sequence is not affected by this mode. The use of WCK2CK automatic synchronization mode is restricted to lower operating frequencies up to fCKAUTOSYNC as described in the datasheets. Table 12 describes WCK2CK training methods for different frequency ranges. Each Frequency range is vendor specific. Normal and PIN mode of WCK2CK training are described in Table 12. Each frequency range is DRAM vendor specific. Divider initialization can be done by training with WCK2CK inversion, WCK2CK stopping, or WCK2CK auto‐sync. If the user wants to use WCK2CK stop for divider initializa‐ tion instead of WCK2CK auto‐sync, the user must not set the WCK2CK auto‐sync. Low frequency, the combined use of PIN and WCK2CK auto‐sync modes can minimize WCK2CK training time.
Table 12 WCK2CK training simplified for Normal mode and PIN mode
High Frequency Frequency WCK2CK alignment mode
Phase Search
Low Frequency < 2Gbps
≥ 2Gbps Normal
Required
PIN
Required
Normal
No*
PIN
No*
* Note: The divided WCK/WCK# should be aligned CK/CK# by WCK2CK Auto Synchronization or WCK stop mode
The following examples describe the WCK2CK training in more detail. Example 1: outline of a basic WCK2CK training sequence without WCK clock stop: 1) Enable training mode via MRS and wait tMRD 2) Sweep and observe the phase independently for WCK01 on EDC0 and WCK23 on EDC2; in case the internal divide‐by‐2 circuits are at opposite phase use either the WCK01 or WCK23 inversion bit to flip one of the WCK divide‐by‐2 circuits 3) Adjust the WCK phase independently for WCK01 and WCK23 to the optimal point (“ideal alignment”) 4) Issue a PLL reset and wait for tLK (PLL on mode only) 5) While all WCK and CK are aligned, exit WCK2CK training mode via MRS 6) Wait tMRD for the reset of data synchronizers
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Example 2: outline of a basic WCK2CK training sequence with optional WCK clock stop: 1) Stop WCK clocks with WCK01/WCK23 LOW and WCK01#/WCK23# HIGH 2) Wait tWCK2MRS for internal WCK clocks to settle 3) Enable training mode via MRS and wait tMRD for divide‐by‐2 circuits to reset 4) Start WCK clocks without glitches (both divide‐by‐2 circuits remain in sync) 5) Wait tWCK2TR for internal WCK clocks to stabilize 6) Sweep and observe the phase independently for WCK01 on EDC0 and WCK23 on EDC2; adjust the WCK phase to the optimal point (“ideal alignment”) 7) Issue a PLL reset and wait tLK (PLL on mode only) 8) While all WCK and CK are aligned, exit WCK2CK training mode via MRS 9) Wait tMRD for the reset of data synchronizers
READ and WRITE latency timings are defined relative to CK. Any offset in WCK and CK at the pins and/ or the phase detector will be reflected in the latency timings. The parameters used to define the relation‐ ship between WCK and CK are shown in Figure 6. For more details on the impact on READ and WRITE timings see the OPERATIONS section.
tCK CK# CK
tCH
tCL
Case 1: Negative tWCK2CKPIN; tWCK2CK = 0 (ideal WCK2CK alignment) tWCKH tWCKL tWCK tWCK2CKPIN WCK# WCK Case 2: Negative tWCK2CKPIN; negative tWCK2CK WCK# WCK Case 3: Positive tWCK2CKPIN; tWCK2CK = 0 (ideal WCK2CK alignment) WCK# WCK Case 4: Positive tWCK2CKPIN; positive tWCK2CK WCK WCK#
Note: tWCK2CKPIN and tWCK2CK parameter values could be negative or positive numbers, depending on the selected WCK2CK alignment point, PLL‐on‐or PLL‐off mode operation and design implementation. They also vary across PVT. WCK2CK training is required to determine the correct WCK‐to‐CK phase for stable device operation.
tWCK2CKPIN + tWCK2CK
tWCK2CKPIN
tWCK2CKPIN + tWCK2CK
Figure 15: WCK2CK Timings
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GDDR5 WCK2CK Training in x16 mode For configurations with WCK clocks not shared between two GDDR5 SGRAMs it is suggested to set the WCK phase to the ideal alignment point. However, for configurations where two GDDR5 SGRAMs (x16) share their WCK clocks as in a x16 clamshell, an offset given by the midpoint of both DRAM’s ideal WCK positions may be required. The maximum allowed offset in this case is specified by parameter tWCK2CKSYNC: it defines the WCK offset range from the ideal alignment which still guarantees a GDDR5 SGRAM device to internally synchronize its WCK and CK clocks upon training exit. Example: outline of training sequence for x32 and x16 configurations with 2 GDDR5 SGRAMs sharing their WCK clocks (e.g. clamshell): 1) Enable training mode for both DRAMs via MRS and wait tMRD 2) For both DRAMs sweep and observe the phase independently for WCK01 on EDC0 and WCK23 on EDC2; in case the internal divide‐by‐2 circuits are at opposite phases use either the WCK01 or WCK23 inversion bit to flip one of the WCK divide‐by‐2 circuits; in case of shared CS# signals use MREMF0 and MREMF1 bits in MR15 to explicitly direct the MRS command for this phase flipping to either DRAM1 or DRAM2 (“soft chip select”); 3) Sweep and observe the phase on DRAM1 independently for WCK01 on EDC0 and WCK23 on EDC2; store the setting for the optimal WCK phase 4) Sweep and observe the phase on DRAM2 independently for WCK01 on EDC0 and WCK23 on EDC2; store the setting for the optimal WCK phase 5) Sweep WCK01 and WCK23 phase to midpoint of DRAM1 and DRAM2 optimal settings 6) Issue a PLL reset and wait for tLK (PLL on mode only) 7) While all WCK and CK are aligned, exit WCK2CK training mode via MRS 8) Wait tMRD for the reset of data synchronizers
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3.4. READ TRAINING
Read training allows the memory controller to find the data‐eye center (symbol training) and burst frame location (frame training) for each high‐speed output of the GDDR5 SGRAM. Each pin (DQ0‐DQ31, DBI0#‐ DBI3#, EDC0‐EDC3) can be individually trained during this sequence. For Read Training the following conditions must be true:
• at least one bank is active, or an auto refresh must be in progress and bit A2 in Mode Register 5 (MR5) is set to 0 to allow training during auto refresh (to disable this special REF enabling of the WCK clock tree an ACT command must be issued, or the device must be set into power‐down or self refresh mode) • WCK2CK training must be complete • the PLL must be locked, if enabled • RDBI and WDBI must be enabled prior to and during Read Training if the training shall include the DBI# pins. RDCRC and WRCRC must be enabled prior to and during Read Training if the training shall include the EDC pins.
The following commands are associated with Read Training:
• LDFF to preload the Read FIFO; • RDTR to read a burst of data directly out of the Read FIFO.
Neither LDFF nor RDTR access the memory core. No MRS is required to enter Read Training. Figure 16 shows an example of the internal data paths used with LDFF and RDTR. Table 13 lists AC timing parameters associated with Read Training.
Table 13 LDFF and RDTR TIMINGS
VALUES PARAMETER ACTIVE to LDFF command delay ACTIVE to RDTR command delay REFRESH to RDTR or WRTR command delay RDTR to RDTR command delay LDFF to LDFF command cycle time LDFF(111) to LDFF command cycle time LDFF(111) to RDTR command delay READ or RDTR to LDFF command delay
a. The min. value does not exceed 8 tCK.
SYMBOL MIN tRCDLTR tRCDRTR tREFTR tCCDS tLTLTR tLTL7TR tLTRTR tRDTLT 10 10 10 2 4 4 4 4 MAX – – – – – – – –
UNIT NOTES ns ns ns tCK tCK tCK tCK tCK
a
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Serial to Parallel Converter RX
e.g. 500Mbps
9
8:1
72
DQ
72
Reverse DBI
64
WRTR strobe (CK domain)
WRTR
FIFO 6 × 72=432 bits per byte
DQ0‐DQ7 DBI0#
e.g. 4Gbps
M U X
CRC8
DRAM Core
0 8 Parallel to Serial Converter TX
1 9
2
3
4
5
6
7 M U X
72 72
DBI
10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
64
9
8:1
72
32 33 34 35 36 37 38 39 WRTR LDFF
72
e.g. 40 41 42 43 44 45 46 47 500Mbps 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 RDTR strobe 01234 output pointer 012345 input pointer
(WCK)
CRC FIFO 6 × 8 =48 bits per byte
Parallel to Serial Converter
M U X
WRTR strobe LDFF strobe (burst 7) M U X
8 8
0 1 2 3 4 5 6 7 012345 input pointer
8 8
DEMUX BA0‐BA2 CRC strobe LDFF strobe (burst 7)
EDC0
TX
8:1
LDFF M U X
RDTR strobe (WCK)
01234 output pointer
10
Address Path
ADDR
RX
8
Data path used with LDFF Data path used with WRTR Data path used with LDFF/WRTR Data path used with RDTR
Notes: 1) FIFO depth of 5 shown; supported FIFO depths: 4, 5 or 6 2) data paths shown for 1 of 4 bytes (byte 0)
Figure 16: Data Paths used for Read and Write Training
LDFF Command The LDFF command (Figure 17) is used to securely load data to the GDDR5 SGRAM Read FIFOs via the address bus. Depending on the GDDR5 SGRAM READ FIFO depth nFIFO 6, any bit pattern of length 32‐ 48 can be loaded uniquely to every DQ, DBI# and EDC pin within a byte. The FIFO depth is fixed by design and can be read via the Vendor ID function. Eight LDFF commands are required to fill one FIFO stage; each LDFF command loads one burst position, and the bank addresses BA0‐BA2 select the burst position from 0 to 7. The data pattern is conveyed on address pins A0‐A7 for DQ0‐DQ7, A9 for DBI0#, and BA3 for EDC0; the data are internally replicated to all 4 bytes, as shown in Figure 18.
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LDFF loads the DBI FIFO regardless of the WDBI and RDBI Mode Register bits. It also loads the EDC FIFO regardless of the WRCRC and RDCRC Mode Register bits, and no CRC is calculated; however, RDBI and RDCRC must be enabled to read the DBI and EDC bits, respectively, with the RDTR command.
LDFF
CK# CK CKE# CS# LOW
RAS# CAS# WE#
A9, BA3 A1, A3 A8,A10,A11 A0,A7,A6 BA0‐BA2 A2, A4,A5
DATA
DATA
0,0,1
DATA
BP BP = Burst Position DATA = FIFO data
DATA
Figure 17: LDFF Command
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 34
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LDFF Command CK# CK L A10 A9 BA0 BA3 BA2 BA1 H A11 L A8 A0 A1 A2 A3 A4 A5 A6 A7 A0 A1 A2 A3 A4 A5 A6 A7 A9 BA3 1 FIFO STAGE = 1 BURST 0 1 2 3 4 5 6 7
Address‐to‐DQ Mapping Byte 0 Byte 1 Byte 2 Byte 3 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 DQ8 DQ9 DQ16 DQ24 DQ17 DQ25
DQ10 DQ18 DQ26 DQ11 DQ19 DQ27 DQ12 DQ20 DQ28 DQ13 DQ21 DQ29 DQ14 DQ22 DQ30 DQ15 DQ23 DQ31
DBI0# DBI1# DBI2# DBI3# EDC0 EDC1 EDC2 EDC3 Burst Position 2 3 4 0 0 1 1 1 0 0 1 0
BA2 BA1 BA0
0 0 0 0
1 0 0 1
5 1 0 1
6 1 1 0
7 1 1 1
LDFF FIFO Load Pulse
Figure 18: LDFF Command Address to DQ/DBI#/EDC Mapping
All burst addresses 0 to 7 must be loaded; LDFF commands to burst address 0 to 6 may be issued in ran‐ dom order; the LDFF command to burst address 7 (LDFF7) must be the last of 8 consecutive LDFF com‐ mands, as it effectively loads the data into the FIFO and results in a FIFO pointer increment. Consecutive LDFF commands have to be spaced by at least tLTLTR, and at least tLTL7TR cycles are required after each LDFF command to burst address 7. LDFF pattern may efficiently be replicated to the next FIFO stages by issuing consecutive LDFF commands to burst address 7 (with identical data pattern). The data pattern in the scratch memory for LDFF will be available until the first RDTR command. The DQ/DBI# output buffers remain in ODT state during LDFF. An amount of LDFF commands to burst address 7 greater than the FIFO depth is allowed and shall result in a looping of the FIFO’s data input. The total number of LDFF commands to burst address 7 modulo FIFO depth must equal the total number of RDTR commands modulo FIFO depth when used in conjunction with RDTR. No READ or WRITE com‐ mands are allowed between LDFF and RDTR. The EDC hold pattern is driven on the EDC pins during LDFF (provided RDQS mode is not enabled).
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RDTR Command A RDTR burst is initiated with a RDTR command as shown in Figure 19. No bank or column addresses are used as the data is read from the internal READ FIFO, not the array. The length of the burst initiated with a RDTR command is eight. There is no interruption nor truncation of RDTR bursts.
RDTR
CK# CK CKE# CS# LOW
RAS# CAS# WE#
A9 (A12) A1 A8,A10,A11 A7,A0,A6 BA0‐BA3 A2‐A5
0,1,1
Figure 19: RDTR Command
A RDTR command may only be issued when a bank is open or a refresh is in progress and bit A2 in MR5 is set to 0 to allow training during refresh. RDBI and RDCRC must be enabled to read the DBI and EDC bits, respectively, with the RDTR command. If not set, the DBI# pins will remain in ODT state, and the EDC pins will drive the EDC hold pattern. In case of the RDQS mode, the EDC pin functions like with a normal READ in this mode. The DBI# pin behaves like a DQ, and no encoding with DBI is performed. An amount of RDTR commands greater than the FIFO depth is allowed and shall result in a looping of the FIFO’s data output. The FIFO depth from which the RDTR data is read must be a number between 4‐6 and must be specified by the DRAM vendor. The FIFO depth is read via the Vendor ID function. During RDTR bursts, the first valid data‐out element will be available after the CAS latency (CL). The latency is the same as for READ. The data on the EDC pins comes with additional CRC latency (tCRCRD) after the CL. Upon completion of a burst, assuming no other RDTR command has been initiated, all DQ and DBI# pins will drive a value of ʹ1ʹ and the ODT will be enabled at a maximum of 1 tCK later. The drive value and ter‐ mination value may be different due to separately defined calibration offsets. If the ODT is disabled, the pins will drive Hi‐Z.
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Data from any RDTR burst may be concatenated with data from a subsequent RDTR command. A contin‐ uous flow of data can be maintained. The first data element from the new burst follows the last element of a completed burst. The new RDTR command should be issued after the first RDTR command according to the tCCDS timing. A WRTR can be issued any time after a RDTR command as long as the bus turn around time tRTW is met. The total number of RDTR commands modulo FIFO depth must be equal to total number of WRTR com‐ mands modulo FIFO depth when used in conjunction with WRTR. No READ or WRITE commands are allowed between WRTR and RDTR. The total number of RDTR commands modulo FIFO depth must be equal to the total number of LDFF commands to burst position 7 modulo FIFO depth when used in conjunction with LDFF. No READ or WRITE commands are allowed between LDFF and RDTR.
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3.5. WRITE TRAINING
Write training allows the memory controller to find the data‐eye center (symbol training) and burst frame location (frame training) for each high‐speed input of the GDDR5 SGRAM. Each pin (DQ0‐DQ31, DBI0#‐ DBI3#) can be individually trained during this sequence. For Write Training the following conditions must be true:
• at least one bank is active, or an auto refresh must be in progress and bit A2 in Mode Register 5 (MR5) is set to 0 to allow training during auto refresh (to disable this special REF enabling of the WCK clock tree an ACT command must be issued, or the device must be set into power‐down or self refresh mode) • the PLL must be locked, if enabled. • WCK2CK training should be complete • Read training should be complete • RDBI and WDBI must be enabled prior to and during Write Training if the training shall include the DBI# pins. RDCRC and WRCRC must be enabled prior to and during Write Training if the training shall include the EDC pins.
The following commands are associated with Write Training:
• WRTR to write a burst of data directly into the Read FIFO; • RDTR to read a burst of data directly out of the Read FIFO.
Neither WRTR nor RDTR access the memory core. No MRS is required to enter Write Training. Figure 16 shows an example of the internal data paths used with WRTR and RDTR. Figure 21 shows a typ‐ ical Write training command sequence using WRTR and RDTR. Table 14 lists AC timing parameters asso‐ ciated with WRITE Training.
Table 14 WRTR and RDTR Timings
VALUES PARAMETER ACTIVE to WRTR command delay ACTIVE to RDTR command delay REFRESH to RDTR or WRTR command delay RD/WR bank A to RD/WR bank B command delay different bank groups WRTR to RDTR command delay WRITE to WRTR command delay READ or RDTR to WRITE or WRTR command delay SYMBOL MIN tRCDWTR tRCDRTR tREFTR tCCDS tWTRTR tWRWTR tRTW 10 10 10 2 WL‐tWLmin WL+CRCWL+2 1 MAX – – – – – – – ns ns ns tCK tCK tCK ns
b a
UNIT
NOTES
a. tCCDS is either for gapless consecutive READ or RDTR (any combination), gapless consecutive WRITE, or gapless consecutive WRTR commands. b. tRTW is not a device limit but determined by the system bus turnaround time. The difference between tWCK2DQO and tWCK2DQI shall be considered in the calculation of the bus turnaround time.
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WRTR Command A WRTR burst is initiated with a WRTR command as shown in Figure 20. No bank or column addresses are used as the data is written to the internal READ FIFO, not the array. The length of the burst initiated with a WRTR command is eight. There is no interruption nor truncation of WRTR bursts.
WRTR
CK# CK CKE# CS# LOW
RAS# CAS# WE#
A9 (A12) A1 A8,A10,A11 A7,A0,A6 BA0‐BA3 A2‐A5
0,1,1
Figure 20: WRTR Command
A WRTR command may only be issued when a bank is open or a refresh is in progress and bit A2 in MR5 is set to 0 to allow training during refresh. WDBI and WRCRC must be enabled to write the DBI and EDC bits, respectively, with the WRTR com‐ mand. If WDBI is not set, a ‘1’ will be written to the DBI FIFO, and a ‘1’ will be assumed for the DBI# input in the CRC calculation. In contrast to a normal WRITE, no CRC is returned by the WRTR command and the EDC pins will drive the EDC hold pattern. In case of the RDQS mode, the EDC pin functions like with a normal READ in this mode. Please note that RDCRC must be enabled to read the calculated CRC data with the RDTR command. An amount of WRTR commands equal to the FIFO depth is required to fully load the FIFO; any number of WRTR commands greater than the FIFO depth is allowed and shall result in a looping of the FIFO’s data input. The FIFO depth to which the WRTR data is written must be 6. The FIFO depth is read via the Ven‐ dor ID function. During WRTR bursts, the first valid data‐in element must be available at the input latch after the Write Latency (WL). The Write Latency is the same as for WRITE. Upon completion of a burst, assuming no other WRTR data is expected on the bus the GDDR5 SGRAM DQ and DBI# pins will be driven according to the ODT state. Any additional input data will be ignored.
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Data from any WRTR burst may be concatenated with data from a subsequent WRTR command. A contin‐ uous flow of data can be maintained. The first data element from the new burst follows the last element of a completed burst. The new WRTR command should be issued after the previous WRTR command according to the tCCDS timing. A RDTR can be issued any time after a WRTR command as long as the internal bus turn around time tRTWTR is met. The total number of WRTR commands modulo FIFO depth must equal the total number of RDTR com‐ mands modulo FIFO depth when used in conjunction with RDTR. No READ or WRITE commands are allowed between WRTR and RDTR.
T0 CK# CK CMD ADDR WLmrs WCK WCK# WRTR
T1
T2
T3
T4
T5
Ta
Ta+1
Ta+2
Ta+3
Ta+4
NOP
WRTR
NOP
NOP
NOP
RDTR
NOP
RDTR
NOP
NOP
WLmrs
tWTRTR
CLmrs
CRCRL
CLmrs
CRCRL
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
DQ
EDC
EDC Hold EDC Hold EDC Hold EDC Hold EDC Hold EDC Hold EDC Hold EDC Hold
1. WLmrs, CLmrs and CRCRL set to 1 for ease of illustration; check Mode Register definition for supported settings 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK.
Figure 21: Write Training using WRTR and RDTR Commands
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D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 Donʹt Care
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5
H5GQ1H24AFR 4. MODE REGISTERS
GDDR5 specifies 10 Mode Registers to define the specific mode of operation. MR0 to MR7 and MR15 are defined as shown in the overview in Figure 22. MR8 to MR13 are not defined and may be used by DRAM vendors for vendor specific features. Reprogramming the Mode Registers will not alter the contents of the memory array. All Mode Registers are programmed via the MODE REGISTER SET (MRS) command and will retain the stored information until they are reprogrammed or the device loses power. Mode Registers must be loaded when all banks are idle and no bursts are in progress, and the controller must wait the specified time tMRD before initiating any subsequent operation. Violating either of these requirements will result in unspecified operation. No default states are defined for Mode Registers except when otherwise noted. Users therefore must fully initialize all Mode Registers to the desired values e.g. upon power-up. Reserved states should not be used, as unknown operation or incompatibility with future versions may result. RFU bits are reserved for future use and must be programmed to 0. Bit A12 is not used for any mode register programming as this address input is not defined for 1G density.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
MR0 MR1 MR2 MR3
0
0
0
0
0
Write Recovery (WR)
TM
CAS Latency (CLmrs)
Write Latency (WLmrs) Driver Strength
0
0
0
1
0
PLL WDBI RDBI PLL Reset ABI
Cal ADR/CMD Data Upd Termination Termination OCD Pullup Driver Offset
0
0
1
0
0
ADR/CMD Data and WCK Termination Offset Termination Offset Bank Groups WCK Termination Info
OCD Pulldown Driver Offset
0
0
1
1
0
RDQS WCK WCK WCK Mode 2CK 23Inv 01Inv Self Refresh
MR4
0
1
0
0
0
EDC WR RD 13Inv CRC CRC
CRC Read CRC Write Latency Latency (CRCWL) (CRCRL)
EDC Hold Pattern
MR5 MR6 MR7 MR14 MR15
0
1
0
1
0
RFU VREFD Offset Upper 2 bytes
PLL Bandwidth (PLLBW) VREFD Offset Lower 2 bytes VREFD
LP3
LP2
RFU
0
1
1
0
0
Auto VREFD WCK VREFD Merge PIN RFU
0
1
1
1
0
DCC
RFU
Half Temp DQ Auto LF VREFD Sense PreA Sync Mode
RFU MRE MRE RFU ADT MF1 MF0
1
1
1
1
0
X
X
X
X
X
X
X
X
Figure 22. Mode Registers Overview
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4.1. MODE REGISTER 0 (MR0)
Mode Register 0 controls operating modes such as Write Latency, CAS latency, Write Recovery and Test Mode as shown in Figure 23. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=0, BA1=0, BA2=0 and BA3=0.
BA3 BA2 BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
0
0
0
0
0
Write Recovery (WR)
TM
CAS Latency (CLmrs)
Write Latency (WLmrs)
A11 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
A10 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
A9 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
A8 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Write Recovery (WR) 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
A7 0 1
Test Mode Normal Test Mode
A2 0 0 0 0 1 1 1 1
A1 0 0 1 1 0 0 1 1
A0 0 1 0 1 0 1 0 1
Write Latency (WLmrs) RFU 1 2 3 4 5 6 7
A6 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
A5 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
A4 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
A3 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
CAS Latency (CLmrs) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Figure 23. Mode Register 0 (MR0) Definition
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WRITE Latency (WLmrs) The WRITE latency (WLmrs) is the delay in clock cycles used in the calculation of the total WRITE latency (WL) between the registration of a WRITE command and the availability of the first piece of input data. DRAM vendor specifications should be checked for value(s) of WLmrs supported. The full WRITE latency definition can be found in the section entitled OPERATION. When the WRITE latencies are set to small values (i.e. 1,2,... clocks), the input receivers never turn off, in turn, raising the operating power. When the WRITE latency is set to higher values (i.e. .. 6, 7 clocks) the input receivers turn on when the WRITE command is registered. Refer to vendor datasheets for value(s) of WLmrs where the input receivers are always on or only turn on when the WRITE command is registered
Speed 6.0Gbps 5.5Gbps 5.0Gbps 4.5Gbps 4.0Gbps Allowable Operating Frequency (Gbps) WL7 WL6 WL5 WL4 WL3 WL2 WL1
CAS Latency (CLmrs) The CAS latency (CLmrs) is the delay in clock cycles used in the calculation of the total READ latency (CL) between the registration of a READ command and the availability of the first piece of output data. By default CLmrs is specified by bits A3‐A6, defining a CLmrs range of 5 to 20 tCK. DRAM vendor specifications should be checked for value(s) of CLmrs supported. The full READ latency definition can be found in the section entitled OPERATION
Speed
RDBI ON/OFF OFF ON OFF ON OFF ON OFF ON OFF ON
Allowable Operating Frequency (Gbps) CL20 CL19 CL18 CL17 CL16 CL15 CL14 CL13 CL12
6.0Gbps
5.5Gbps
5.0Gbps
4.5Gbps
4.0Gbps
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WRITE Recovery (WR) The programmed WR value is used for the auto precharge feature along with tRP to determine tDAL. The WR register bits are not a required function and may be implemented at the discretion of the DRAM manufacturer. WR must be programmed with a value greater than or equal to RU{tWR/tCK}, where RU stands for round up, tWR is the analog value from the vendor datasheet and tCK is the operating clock cycle time. By default WR is specified by bits A8‐A11, defining a WR range of 4 to 19 tCK. Test Mode The normal operating mode is selected by issuing a MODE REGISTER SET command with bit A7 set to ’0’, and bits A0‐A6 and A8‐A11 set to the desired values. Programming bit A7 to ‘1’ places the device into a test mode that is only to be used by the DRAM manufacturer. No functional operation is specified with test mode enabled.
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4.2. MODE REGISTER 1 (MR1)
Mode Register 1 controls functions like drive strength, data termination, address/command termination, Read DBI, Write DBI, ABI, control of calibration updates and PLL as shown in Figure 24. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=1, BA1=0, BA2=0 and BA3=0. Bits A0‐A1, A4‐A6 and A10 of this register are initialized with’0’s.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
0
0
1
0
PLL ABI WDBI RDBI PLL Reset
Cal ADR/CMD Data Upd Termination Termination
Driver Strength
A1 0 A11 0 1 PLL Reset No Yes
A0 0 1 0 1
Driver Strength
Auto Calibration On
A7 0 1
PLL Off On
0 1 1
RFU Nominal (60/40) RFU
A10 0 1
ABI On Off
A6 0 1
Calibration Update On Off
A3 0 0 1 1
A2 0 1 0 1
Data Termination Disabled ZQ/2 ZQ RFU
A9 0 1
Write DBI On Off
A8 0 1
Read DBI On Off A5 0 0 1 1 A4 0 1 0 1 ADD/CMD Termination CKE# value at Reset ZQ/2 ZQ Disabled
Figure 24. Mode Register 1 (MR1) Definition
Impedance Autocalibration of Output Buffer and Active Terminator GDDR5 SGRAMs offer autocalibrating impedance output buffers and on‐die terminations. This enables a user to match the driver impedance and terminations to the system within a given range. To adjust the impedance, an external precision resistor is connected between the ZQ pin and VSSQ. A nominal resistor
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value of 120 Ohms is equivalent to the 40 Ohms Pulldown and 60 Ohms Pullup nominal impedances of GDDR5 SGRAMs. RESET#, CK and CK# are not internally terminated. CK and CK# shall be terminated on the system using external 1% resistors to VDDQ. The output driver and on‐die termination impedances are updated during all REFRESH commands to compensate for variations in supply voltage and temperature. The impedance updates are transparent to the system. Driver Strength Bits A0 and A1 define the driver strength. The Auto Calibration setting enables the Auto‐Calibration functionality for the Pulldown, Pullup and Termination over process, temperature and voltage changes. The design target for the factory setting is 40 Ohm Pulldown, 60 Ohm Pullup driver strength with nominal process, voltage and temperature conditions. The nominal option enables the factory setting for the Pulldown, Pullup driver strength and termination. With this option enabled, driver strength and termination are expected to change with process, voltage and temperature. AC timings are only guaranteed with Auto Calibration. Data Termination Bits A2 and A3 define the data termination value for the on‐die termination (ODT) for the DQ and DBI# pins in combination with the driver strength setting. The termination can be set to a value of ZQ/2 which is intended for a single loaded system, or ZQ which is intended for a weaker termination used in a lower power or frequency applications. The data termination may also be turned off. ADR/CMD Termination Bits A4 and A5 define the address/command termination. The default setting (’00’) provides that the address/command termination is determined by latching CKE# on the rising edge of RESET#. The address/command termination can also be set to a value of ZQ/2 which is intended for a single loaded system, or ZQ which is intended for double loaded configurations with two devices sharing a common address/command bus. The address/command termination may also be turned off.
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Calibration Update The Calibration Update setting enables the calibration value to be updated automatically by the auto calibration engine. The function is enabled upon power‐up to reduce update induced jitter. The user may decide to suppress updates from the auto calibration engine by disabling Calibration Update (A6=1). The calibration updates can occur with any REFRESH command. The update is not complete for a time tKO after the latching of the REFRESH command. During this tKO time, only NOP or DESELECT commands may be issued PLL and PLL Reset If a PLL is to be used, it must be enabled for normal operation by setting bit A7 to ’1’. A PLL reset is done by turning the PLL off then on, or by use of the PLL Reset bit A11. The PLL Reset bit is self clearing meaning that it returns back to the value ‘0’ after the PLL reset function has been issued. RDBI and WDBI Bit A8 controls Data Bus Inversion (DBI) for READs (RDBI), and bit A9 controls Data Bus Inversion for WRITEs (WDBI). For more details on DBI see READ and WRITE Data Bus Inversion (DBI) in the section entitled OPERATION. ABI Address Bus Inversion (ABI) is selected independently from DBI using bit A10. When enabled any data sent over the address bus (whether opcode, addresses, LDFF data or DM) is inverted or not inverted based on the state of ABI# signal. For more details on ABI see Address Bus Inversion (ABI) in the section entitled OPERATION.
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4.3. MODE REGISTER 2 (MR2)
Mode Register 2 defines the output driver (OCD) and termination offsets as shown in Figure 25. Mode Register 2 is programmed via the MODE REGISTER SET (MRS) command with BA0=0, BA1=1, BA2=0 and BA3=0.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
0
1
0
0
ADR/CMD Data and WCK Termination Offset Termination Offset
OCD Pullup Driver Offset
OCD Pulldown Driver Offset
A8 0 0 0 0 1 1 1 1
A7 0 0 1 1 0 0 1 1
A6 0 1 0 1 0 1 0 1
Data and WCK Termination Offset 0 +1 +2 +3 ‐4 ‐3 ‐2 ‐1
A2 0 0 0 0 1 1 1 1
A1 0 0 1 1 0 0 1 1
A0 0 1 0 1 0 1 0 1
OCD Pulldown Driver Offset 0 +1 +2 +3 ‐4 ‐3 ‐2 ‐1
A11 0 0 0 0 1 1 1 1
A10 0 0 1 1 0 0 1 1
A9 0 1 0 1 0 1 0 1
ADR/CMD Termination Offset 0 +1 +2 +3 ‐4 ‐3 ‐2 ‐1
A5 0 0 0 0 1 1 1 1
A4 0 0 1 1 0 0 1 1
A3 0 1 0 1 0 1 0 1
OCD Pullup Driver Offset 0 +1 +2 +3 ‐4 ‐3 ‐2 ‐1
Figure 25. Mode Register 2 (MR2) Definition
Impedance Offsets The driver and termination impedances may be offset individually for PD driver, PU driver, DQ/DBI#/ WCK termination and address/command termination. The offset impedance step values may be non‐ linear and will vary across PVT. With negative offset steps the drive strengths will be decreased and Ron
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will be increased. With positive offset steps the drive strengths will be increased and Ron will be decreased. With negative offset steps the termin‐ation value will be increased. With positive offset steps the termination value will be decreased. IV curves and AC timings are only guaranteed with zero offset.
Offset PU Driver Autocalibrated Impedance Offset PD Driver Auto/Fixed nominal (60/40) Fixed Impedance Offset ADD/CMD Termination
Pullup Impedance
ZQ 120 Ohms
Calibration Engine
Pulldown Impedance
VSSQ
ADD/CMD Termination Impedance
Note: sum of offset + auto‐ calibrated impedance cannot exceed maximum/ minimum available impedance steps
Offset DQ/DBI#/WCK Termination DQ/DBI#/WCK Termination Impedance
Figure 26. Impedance Offsets
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4.4. MODE REGISTER 3 (MR3)
Mode Register 3 controls functions including Bank Groups, WCK termination, self refresh, RDQS mode, DRAM Info and WCK2CK training as shown in Figure 27. Mode Register 3 is programmed via the MODE REGISTER SET (MRS) command with BA0=1, BA1=1, BA2=0 and BA3=0.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
0
1
1
0
Bank Groups
WCK Termination
Info
RDQS WCK WCK WCK Mode 2CK 23Inv 01Inv Self Refresh
A11 0 1
A10 X X
Bank Groups off / tCCDL = 2 tCK on / tCCDL = 3 tCK
A1
0 0 1 1
A0
0 1 0 1
Self Refresh
32 ms 16ms
8ms RFU
A9 0 0 1 1
A8 0 1 0 1
WCK Termination Disabled ZQ/2 ZQ RFU A3 0 WCK23 Invert Off On A5 0 1 RDQS Mode Off On A2 0 1 WCK01 Invert Off On
A7 0 0 1 1
A6 0 1 0 1
DRAM Info off Vendor ID Temperature Readout RFU A4 0 1
1
WCK2CK Training Off On
Figure 27. Mode Register 3 (MR3) Definition
Self Refresh The refresh interval in self refresh mode may be set to 32ms, 16ms and 8ms.
WCK2CK
Bit A4 (WCK2CK) enables and disables the WCK2CK alignment training. For details on this training sequence, see the section on TRAINING.
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WCK01 / WCK23 Inversion Bits A2 and A3 control whether the internal phase of the WCK01 and WCK23 clock inputs after internal divide‐by‐2 shall be inverted, corresponding to a 2 U.I. phase shift. The bits are used in conjunction with WCK2CK training mode. RDQS Mode Bit A5 enables the RDQS mode of the GDDR5 SGRAM. In this mode the EDC pins will act as a READ strobe (RDQS). No CRC is supported in RDQS mode, and all related bits in MR4 will be ignored. A detailed description of the RDQS mode can be found in the section entitled OPERATION. DRAM Info Bits A6 and A7 enable the DRAM Info mode which is provided to output the Vendor ID, or the current junction temperature. The Vendor ID identifies the manufacturer of the GDDR5 SGRAM, and provides the die revision, memory density and FIFO depth. The Temperature Readout provides the SGRAM’s junction temperature. The on‐chip temperature sensor is enabled in advance by bit A6 in MR7. WCK Termination Bits A8 and A9 define the termination value for the on‐die termination (ODT) for the WCK01, WCK01#, WCK23 and WCK23# pins in combination with the driver strength setting. The termination can be set to a value of ZQ/2 which is intended for a single loaded system, or ZQ which is intended for double load configurations with two devices sharing the WCK clocks. The WCK termination may also be turned off. Bank Groups Bit A11 enables the bank groups feature. With A11 set to ‘1’, the bank groups feature is enabled and tCCDL is 3tCK.
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4.5. MODE REGISTER 4 (MR4)
Mode Register 4 defines the Error Detection Code (EDC) features of GDDR5 SGRAMs as shown in Figure 28. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=0, BA1=0, BA2=1 and BA3=0. Bits A0‐A3 (EDC Hold Pattern) of this register are initialized with ’1111’.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
1
0
0
0
EDC WR RD 13Inv CRC CRC
CRC Read Latency CRC Write Latency (CRCWL) (CRCRL)
EDC Hold Pattern
A11 0 1
EDC Hold Pattern Invert for EDC1 + EDC3 EDC hold pattern not inverted EDC hold pattern inverted
A3 0
A2 0
A1 0
A0 0
EDC Hold Pattern Pattern ...
1
1
1
1
Pattern
Burst Burst Burst Burst Pos 3 Pos 2 Pos 1 Pos 0
A10 0 1
WR CRC On Off
A9 0 1
RD CRC On Off A6 0 0 0 A5 0 0 1 1 0 0 1 1 A4 0 1 0 1 0 1 0 1 CRC Write Latency (CRCWL) N/A 8 9 10 11 12 13 14
A8 0 0 1 1
A7 0 1 0 1
CRC Read Latency (CRCRL) 0 1 2 3
0 1 1 1 1
Figure 28. Mode Register 4 (MR4) Definition
EDC Hold pattern / EDC13 Invert The 4‐bit EDC hold pattern is considered a background pattern transmitted on the EDC pins. The register is initialized with all ’1’s. The pattern is shifted from right to left and repeated with every clock cycle. The output timing is the same as of a READ burst. CRC bursts calculated from WRITEs or READs will replace the EDC hold pattern for the duration of those bursts, provided CRC is enabled for those bursts. With each MRS command to MR4 that changes bits A0‐A3 or A9‐A11, the EDC hold pattern will be undefined for tMRD.
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The EDC hold pattern will not be transmitted when the device is in address training mode, in WCK2CK training mode, in RDQS mode, in self refresh mode, in reset state, in power‐down state with the LP2 bit set, or in scan mode. With register bit A11 set High, EDC1 and EDC3 will transmit the inverted EDC hold pattern, resulting in a pseudo‐differential pattern. Please note that this function is not available in x16 configuration. Bit A11 is ignored for READ, WRITE and RDTR CRC bursts and the clock phase information in WCK2CK training mode.
CRC Write Latency (CRCWL) The value of the CRC write latency is loaded into register bits A4‐A6. If the DRAM vendor does not support the Mode Register definition of CRCWL, the Mode Register settings will be ignored. In that case the valid fixed latency is given with the DRAM vendor’s specification. The user must set the CRCWL Mode Register bits.
Allowable Operating Frequency (Gbps) CRCWL14 CRCWL13 CRCWL12 CRCWL11 CRCWL10 CRCWL9 CRCWL8
Speed 6.0Gbps 5.5Gbps 5.0Gbps 4.5Gbps 4.0Gbps
CRC Read Latency (CRCRL) The value of the CRC read latency is loaded into register bits A7‐A8. If the DRAM vendor does not support the Mode Register definition of CRCRL, the Mode Register settings will be ignored. In that case the valid fixed latency is given with the DRAM vendor’s specification. The user must set the CRCRL Mode Register bits.
Speed RDBI ON/OFF OFF ON OFF ON OFF ON OFF ON OFF ON Allowable Operating Frequency (Gbps) CRCRL3 CRCRL2 CRCRL1 CRCRL0
6.0Gbps
5.5Gbps
5.0Gbps
4.5Gbps
4.0Gbps
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Read CRC Bit A9 controls the CRC calculation for READ bursts. When enabled, the calculated CRC pattern will be transmitted on the EDC pins with the latency as programmed in the CRCRL field of this register. With Read CRC being off, no CRC will be calculated for READ bursts, and the EDC hold pattern will be transmitted instead. Write CRC Bit A10 controls the CRC calculation for WRITE bursts. When enabled, the calculated CRC pattern will be transmitted on the EDC pins with the latency as programmed in the CRCWL field of this register. With Write CRC being off, no CRC will be calculated for WRITE bursts, and the EDC hold pattern will be trans‐ mitted instead.
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4.6. MODE REGISTER 5 (MR5)
Mode Register 5 defines digital RAS, PLL band‐width and low power modes as shown in Figure 29. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=1, BA1=0, BA2=1 and BA3=0.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
1
0
1
0
RFU
PLL Bandwidth
LP3
LP2
RFU
A1 A5 0 0 0 0 1 1 1 1 A4 0 0 1 1 0 0 1 1 A3 0 1 0 1 0 1 0 1 ‐3dB [MHz] BW3dBLL 13 18 22 28 36 44 54 69 Peak [MHz] BWPKLL 2 4 5 7 10 13 15 20 Peak [dB] PKLL < 1.2 < 1.1 < 1.1 < 1.2 < 1.2 < 1.2 < 1.7 < 1.5 A2 0 1 LP3 Off On 0 1
LP2 Off On
Note 1) PLL BW characteristics is extracted at 4Gbps Note 2) PLL BW is linearly proportional to the data rate
Figure 29. Mode Register 5 (MR5) Definition
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Low Power Modes (LP2, LP3) Bits A1‐A2 control several low power modes of the GDDR5 SGRAM. The modes are independent of each other. When bit A1 (LP2) is set, the WCK receivers may be turned off during power‐down. When bit A2 (LP3) is set, RDTR, WRTR and LDFF commands are not allowed while a REF command is being executed.
PLL Bandwidth
The PLL bandwidth may optionally be configured to match system characteristics. Each setting defines a unique combination of ‐3dB corner frequency, peaking frequency and peaking magnitude.
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4.7. MODE REGISTER 6 (MR6)
Mode Register 6 controls the WCK2CK alignment point and defines VREFD related features such as source, level, offsets, VREFD Merge and VREFD Auto Calibration mode, as shown in Figure 30. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=0, BA1=1, BA2=1 and BA3=0.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
1
1
0
0
VREFD Offset Bytes in rows A‐F
VREFD Offset Bytes in rows M‐U
Auto VREFD WCK VREFD VREFD Merge PIN
A11 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
A10 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
A9 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
A8 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
VREFD Offset 0 / default +1 +2 +3 +4 +5 +6 +7 0 / Auto (opt.) ‐7 ‐6 ‐5 ‐4 ‐3 ‐2 ‐1
A7 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
A6 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
A5 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
A4 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
VREFD Offset 0 / default +1 +2 +3 +4 +5 +6 +7 0 / Auto (opt.) ‐7 ‐6 ‐5 ‐4 ‐3 ‐2 ‐1 A3 0 1 A1 0 1
A0 0 1
WCK2CK Alignment Pt. PD inside DRAM PD at pins
VREFD Merge Off On
VREFD external VREFD pins internally generated
Figure 30. Mode Register 6 (MR6) Definition
WCK2CK Alignment Point (WCKPIN) Bit A0 defines the position of the alignment point between CK and WCK. When set to ‘0‘, the alignment point will be at the phase detector inside the GDDR5 SGRAM. When set to ‘1‘, the alignment point will be at the CK and WCK pins. Input Reference Voltage for DQ and DBI# Pins GDDR5 SGRAMs offer multiple options for the input reference voltage (Vref) for the DQ and DBI# pins, as shown in Figure 31.
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Separate Vref circuits are associated with the bytes in rows A to F and the bytes in rows M to U, with separate VREFD pins for the required external Vref. The only mandatory mode is that Vref will be supplied externally at the VREFD pins. This mode is configured with bits A1‐A3 and bit A7 in MR7 all set to ’0’.
VREFD Offsets
0.7*VDDQ (opt.)
0.5*VDDQ (opt.)
+
VREFD
VREFD Merge (opt.)
+
‐ Receiver
DQ/DBI#
+
Figure 31. VREFD Options
VREFD Merge The VREFD Merge mode is enabled when bit A1 is set to’1’. The externally supplied VFRED and the internally generated Vref will be merged, resulting in the average value of both. DRAM vendor specifications should be checked for values of external resistors that may be connected to VREFD pins in this VREF Merge mode. Auto VREFD Training When Auto is set for VREFD offsets, the internal Vref generator must be trained. Bit A2 enables this training; the bit is self‐clearing, meaning that it returns back to the value ‘0’ after the training has completed. Once the training mode is enabled, the GDDR5 SGRAM drives the EDC pins Low to indicate to the controller that the training has started. The controller is now expected to send the specified PRBS pattern to the GDDR5 SGRAM. Upon completion of the training, the GDDR5 SGRAM stops driving the EDC pins Low, and the EDC pins will resume transmitting the EDC hold pattern. But, it is not supported. VREFD Bit A3 selects between external and internal Vref. The bit is “Don’t Care” when VREF Merge mode is selected. VREFD Offsets and VREFD Auto Mode It supports the capability to offset Vref independently for the upper 2 bytes and the lower 2 bytes. The offset step values may be non‐linear and will vary across PVT.
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The vendors may optionally support the offset capability to be applied to the external Vref (not shown in Figure 31). The optional Auto setting for VREFD enables the GDDR5 SGRAM to search for its own optimal internal Vref. There is no offset from this internally determined value (see also Auto VREFD Training).
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4.8. MODE REGISTER 7 (MR7)
Mode Register 7 controls features like PLL Standby, PLL Fast‐Lock, PLL Delay Compensation, Low Frequency mode, Auto Synchronization, Data Preamble, Temperature Sensor operation, Half VREFD, VDD Range and DCC as shown in Figure 32. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=1, BA1=1, BA2=1 and BA3=0.
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
1
1
1
0
DCC
RFU
Half Temp DQ Auto LF VREFD Sense PreA Sync Mode
RFU
A11 0 0 1 1
A10 0 1 0 1
DCC no DCC / DCC off or hold / opt. DCC start DCC reset l RFU A4 0 1 WCK2CK Auto Sync Off On
A5 0 1
Data Preamble Off On
A3 0 1
Low Frequency Mode Off On
A7 0 1
Half VFRED 0.7 * VDDQ 0.5 * VDDQ
A6 0 1
Temperature Sensor Off On
Figure 32. Mode Register 7 (MR7) Definition
Low Frequency Mode When Low Frequency Mode is enabled by bit A3, the power consumption of input receivers and clock trees is reduced. The maximum operating frequency for this low frequency mode is given in the vendor‘s datasheet. WCK2CK Auto Synchronization GDDR5 SGRAMs support a WCK2CK automatic synchronization mode that eliminates the need for WCK2CK training upon power‐down exit or for reducing WCK2CK training time at low frequency. This mode is controlled by bit A4. For a detailed description see WCK2CK Auto Synchronization in the section entitled WCK2CK Training.
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Data Preamble When enabled by bit A5, non‐gapless READ bursts will be preceded by a fixed data preamble on the DQ and DBI# pins of 4 U.I. duration. The programmed READ latency does not change when the Data Preamble is enabled. The pattern is not encoded with RDBI, however, if RDBI is disabled, the DBI# pins will not toggle and drive a HIGH. Temperature Sensor The on‐chip temperature sensor is enabled by bit A6. A detailed description of the Temperature Sensor can be found in the VENDOR ID, TEMP SENSOR and SCAN section. Half VREFD This mode allows users to adjust the Vref level in case the GDDR5 SGRAM is operated without termination: when bit A7 is set to’1’, a Vref level of nominally 0.5 * VDDQ is expected at the VREFD pin or being generated internally (see Figure 31). Duty Cycle Correction (DCC) Bits A10 and A11 control the operation of the duty cycle corrector (DCC). The DCC can be used to cancel out a static duty cycle error on the WCK clocks. For more details see Duty Cycle Correction (DCC) in the section entitled OPERATION. VREFD Selection Options Summary The following table summarizes the complete set of VREFD selection options.
Table 15 VREFD Selection Options
MR6 A3 Internal VREFD 0 0 1 1 MR7 A7 Half VREFD 0 1 0 1 External External Internal 0.7 * VDDQ Internal 0.5 * VDDQ Description
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4.9. MODE REGISTER 15 (MR15)
Mode Register 15 controls address training mode (ADT) and access to Mode Registers 0 to 14 (MRE) as shown in Figure 33. The register is programmed via the MODE REGISTER SET (MRS) command with BA0=1, BA1=1, BA2=1 and BA3=1. Mode Register 15 is a special register that operates in SDR addressing mode. Increased setup and hold times as for command inputs are assumed to ensure the MRS command to this register is successful while address training (ADT) has not taken place and the integrity of DDR addresses may not be guaranteed. This is indicated by setting bits A0‐A7 to Don’t Care (“X”) which are paired with the usable bits (A8‐A11) and the Mode Register address (BA0‐BA3).
BA3 BA2 BA1 BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
1
1
1
1
0
RFU ADT
MRE MRE MF1 MF0
X
X
X
X
X
X
X
X
A10 Address Training (ADT) 0 1 Off On
A9 0 1
MR0‐14 Enable MF=1 Enabled Disabled
A8 0 1
MR0‐14 Enable MF=0 Enabled Disabled
Figure 33. Mode Register 15 (MR15) Definition
Address Training (ADT) Address training mode is enabled and disabled with bit A10. Mode Register 0‐14 Enable When disabled by bit A8 (for SGRAMs configured to MF=0) or bit A9 (for SGRAMs configured to MF=1), the GDDR5 SGRAM will ignore any MODE REGISTER SET command to Mode Registers 0 to 14. If enabled, MODE REGISTER SET commands function as normal. MODE REGISTER SET commands to Mode Register 15 (this register) are not affected and will always be executed. This functional allows for individual configuration of two GDDR5 SGRAMS on a common address bus without the use of a CS# pin.
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H5GQ1H24AFR 5. OPERATION
5.1. COMMANDS Table 16 Truth Table ‐ Commands
Operation
Symbol
Previous Current cycle cycle DESELECT (NOP) NO OPERATION (NOP) MODE REGISTER SET ACTIVE (Select bank & activate row) READ (Select bank and column, & start burst) READ with Autoprecharge Load FIFO READ Training WRITE without Mask (Select bank and column, & start burst) WRITE without Mask with Autoprecharge WRITE with single‐byte mask WRITE with single‐byte mask with Autoprecharge WRITE with double‐byte mask (WDM) WRITE with double‐byte mask with Autoprecharge WRITE Training PRECHARGE (Deactivate row in bank or banks) PRECHARGE ALL REFRESH POWER DOWN ENTRY POWER DOWN EXIT SELF REFRESH ENTRY SELF REFRESH EXIT DES NOP MRS ACT RD RDA LDFF RDTR WOM L L L L L L L L L X X L L L L L L L
CKE# CS#
H L L L L L L L L
RAS# CAS# WE#
X H L L H H H H H X H L H L L L L L X H L H H H H H L
BA
X X MRA BA BA BA X X BA
A11
X X
A10
X X
A8
X X Opcode RA
A6, A7, A9, (A12)
X X
A0‐ A5 (A6)
X X
Notes
1, 2, 8 1, 2, 8 1, 2, 3 1, 2, 4
L L H H L
L L L H L
L H L L L
X X X X X
CA CA X X CA
1, 2, 5, 9 1, 2, 5 1, 2, 7 1, 2 1, 2, 5
WOMA WSM WSMA WDM WDMA WRTR PRE PREALL REF PDE PDX SRE SRX
L L L L L L L L L L H L H
L L L L L L L L L H L H L
L L L L L L L L L H L H L L H L
H H H H H H L L L X H X H L X H
L L L L L L H H L X H X H L X H
L L L L L L L L H X H X H H X H
BA BA BA BA BA X BA X X X X X X X
L L L H H H X X X X X X X X
L H H L L H X X X X X X X X
H L H L H L L H X X X X X X
X X X X X X X X X X X X X X
CA CA CA CA CA X X X X X X X X X
1, 2, 5 1, 2, 5 1, 2, 5 1, 2, 5 1, 2, 5 1, 2 1, 2 1, 2 1, 6 1 1 1 1, 6 1
Notes: 1) H = Logic High Level; L = Logic Low Level; X = Don’t care: signal may be H or L, but not floating 2) Addresses shown are logical addresses; physical addresses are inverted when address bus inversion (ABI) is activated and ABI#=L 3) BA0‐BA3 provide the Mode Register address (MRA), A0‐A11 the opcode to be loaded 4) BA0‐BA3 provide the bank address (BA), A0‐A11 (A12) provide the row address (RA). 5) BA0‐BA3 provide the bank address, A0‐A5 (A6) provide the column address (CA); no sub‐word addressing within a burst of 8. 6) The command is Refresh when CKE#(n) = L and Self Refresh Entry when CKE#(n) = H. 7) BA0‐BA3 and CA are used to select burst location and data respectively 8) DESELECT and NOP are functionally interchangeable 9) In address training mode READ is decoded from the commands pins only with RAS# = H, CAS# = L, WE# = H
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Figure 34 and Figure 35 illustrate the timings associated with the Command and Address input as well as Data input.
tCK CK# CK
tCH
tCL
tCMDPW COMMAND tAPW ADDRESS tAPW tAS tAH
tCMDS tCMDH
tAS tAH
Donʹt Care
Figure 34. Command and Address Input Timings
WCK# WCK tWCK2DQI
tWCK2DQI
tDIPW tDIVW DQ/DBI# (1 Pin)
tDIPW tDIVW
Figure 35. Data Input Timings
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5.2. DESELECT (NOP)
The DESELECT function (CS# HIGH) prevents new commands from being executed by the GDDR5 SGRAM. The GDDR5 SGRAM is effectively deselected. Operations already in progress are not affected.
5.3. NO OPERATION (NOP)
The NO OPERATION (NOP) command is used to instruct the selected GDDR5 SGRAM to perform a NOP (CS# LOW). This prevents unwanted commands from being registered during idle or wait states. Opera‐ tions already in progress are not affected.
5.4. MODE REGISTER SET
The MODE REGISTER SET command is used to load the Mode Registers of the GDDR5 SGRAM. The bank address inputs BA0‐BA3 select the Mode Register, and address puts A0‐A11(A12) determine the op‐code to be loaded. See MODE REGISTER for a register definition. The MODE REGISTER SET command can only be issued when all banks are idle and no bursts are in progress, and a subsequent executable com‐ mand cannot be issued until tMRD is met.
Mode Register Set
CK# CK CKE# LOW
CS#
RAS#
CAS# WE#
A8‐A11 (A12) A0,A1,A6,A7 BA0‐BA3 A2‐A5
CO A8,9,10,11, (12)
CO A0,1,6,7
BA BA0,1,2,3
CO A2,3,4,5
RA = Row Address DONʹT CARE CO = Op‐code BA = Bank Address EN AP = Enable Auto Precharge DIS AP = Disable Aut o Precharge
Figure 36. MRS Command
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CK# CK CMD NOP PRE ALL NOP tRP Old Setting MRS NOP tMRD Updating Setting New Setting A.C. NOP
A.C. = any command allowed in bank idle state
Figure 37. Mode Register Set Timings 5.5. ACTIVATION
Before any READ or WRITE commands can be issued to a bank in the GDDR5 SGRAM, a row in that bank must be “opened”. This is accomplished by the ACTIVE command (see Figure 38): BA0 ‐BA3 select the bank, and A0‐A11 (A12) select the row to be activated. Once a row is open, a READ or WRITE command could be issued to that row, subject to the tRCD specification. A subsequent ACTIVE command to another row in the same bank can only be issued after the previous row has been closed (precharged). The minimum time interval between two successive ACTIVE com‐ mands on the same bank is defined by tRC. A minimum time, tRAS, must have elapsed between opening and closing a row. A subsequent ACTIVE command to another bank can be issued while the first bank is being accessed, which results in a reduction of total row‐access overhead. The minimum time interval between two suc‐ cessive ACTIVE commands on different banks to different bank groups is defined by tRRDS. With bank groups enabled, the minimum time interval between two successive ACTIVE commands to different banks in the same bank group is defined by tRRDL. In all other cases the interval is defined by tRRDS. Figure shows the tRCD and tRRD definition.
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The row remains active until a PRECHARGE command (or READ or WRITE command with Auto Pre‐ charge) is issued to the bank.
Row Activation
CK# CK CKE# LOW
CS#
RAS#
CAS# WE#
A8‐A11 (A12) A0, A1,A6,A7 BA0‐BA3 A2‐A5
RA
A8,9,10,11, (12)
RA
A0,1,6,7
BA
BA0,1,2,3
RA
A2,3,4,5
RA = Row Address CA = Column Address BA = Bank Address
DONʹT CARE
Figure 38. Active Command
T0 CK# CK CMD ADDR NOP
T1
T2
Ta0
Ta1
Tb0
Tb1
Tc0
Tc1
ACT BA RA RA
NOP
RD/WR
NOP
PRE* BA
NOP
ACT BA RA RA
NOP
BA CA tRCD tRAS
tRP tRC
(*) = could also be PREALL
BA = bank address; RA = row address; CA = column address tRCD = tRCDRD, tRCDWR, tRCDRTR, tRCDWTR or tRCDLTR, depending on command
Donʹt Care
Figure 39. Bank Activation Command Cycle
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5.6. BANK RESTRICTIONS
There may be a need to limit the number of activates in a rolling window to ensure that the instantaneous current supplying capability of the devices is not exceeded. To reflect the short term capability of the GDDR5 SGRAM current supply, the parameter tFAW (four activate window) is defined. No more than 4 banks may be activated in a rolling tFAW window. Converting to clocks is done by dividing tFAW (ns) by tCK (ns) and rounding up to next integer value. As an example of the rolling window, if (tFAW/tCK) rounds up to 10 clocks, and an activate command is issued at clock N, no more than three further activate com‐ mands may be issued at clocks N+1 through N+9 as illustrated in Figure 40. To reflect a longer term GDDR5 SGRAM current supply capability, the parameter t32AW (thirty‐two acti‐ vate window) is defined. No more than 32 banks may be activated in a rolling t32AW window. Converting to clocks is done by dividing t32AW (ns) by tCK (ns) and rounding up to next integer value. The use of a shorter and longer rolling activation window allows the GDDR5 SGRAM design to be optimized to handle higher instantaneous currents within a shorter window while still limiting the current strain over a longer period of time. This means that in general t32AW will be greater than or equal to 8* tFAW as shown in Figure41. It is preferable that GDDR5 SGRAMs have no rolling activation window restrictions (tFAW = 4 * tRRD).
CK# CK CMD ACT
tRRD
ACT
ACT
ACT
ACT
ACT
ACT
ACT
tRRD
tRRD tFAW tFAW + 3 * t RRD
tRRD
tRRD
tRRD
tRRD = tRRDL or tRRDS depending on Bank Groups on/off setting and accessed banks
Figure 40. tRRD and tFAW
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A.) t32AW > 8 * tFAW
tFAW
tFAW
tFAW
tFAW
tFAW
tFAW
tFAW
tFAW
tFAW
t32AW
B.) t32AW = 8 * tFAW
tFAW
tFAW
tFAW
tFAW t32AW
tFAW
tFAW
tFAW
tFAW
tFAW
Figure 41. t32AW
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5.7. WRITE (WOM)
WRITE bursts are initiated with a WRITE command as shown in Figure 42. The bank and column addresses are provided with the WRITE command and auto precharge is either enabled or disabled for that access with the A8 pin. If auto precharge is enabled, the row being accessed is precharged at the com‐ pletion of the burst after tRAS(min) has been met. The length of the burst initiated with a WRITE command is eight and the column address is unique for this burst of eight. There is no interruption nor truncation of WRITE bursts.
WRITE
CK# CK CKE# CS# RAS# CAS# WE# A10,A11 A0,A6 A9 (A12) A1 A8 A7 BA0‐BA3 A2‐A5
EN AP DIS AP
LOW
0,0
CA CA
BA
CA
BA = Bank Address; CA = Column Address EN AP = Enable Auto‐Precharge; DIS AP = Disable Auto‐Precharge
Figure 42. WRITE Command
During WRITE bursts, the first valid data‐in element must be available at the input latch after the Write Latency (WL). The Write Latency is defined as WLmrs * tCK + tWCK2CKPIN + tWCK2CK + tWCK2DQI, where WLmrs is the number of clock cycles programed in MR0, tWCK2CKPIN is the phase offset between WCK and CK at the pins when phase aligned at phase detector, tWCK2CK is the alignment error between WCK and CK at the GDDR5 SGRAM phase detector, and tWCK2DQI is the WCK to DQ/DBI# offset as measured at the DRAM pins to ensure concurrent arrival at the latch. The total delay is relative to the data eye center averaged over one double‐byte. The maximum skew within a double‐byte is defined by tDQDQI. The data input valid window, tDIVW, defines the time region when input data must be valid for reliable data capture at the receiver for any one worst‐case channel. It accounts for jitter between data and clock at the latching point introduced in the path between the DRAM pads and the latching point. Any additional jitter introduced into the source signals (i.e. within the system before the DRAM pad) must be accounted for in the final timing budget together with the chosen PLL mode and bandwidth. tDIVW is measured at the pins. tDIVW is defined for the PLL off and on mode separately. In the case of PLL on, tDIVW must be specified for each supported bandwidth. In general tDIVW is smaller than tDIPW.
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The data input pulse width, tDIPW, defines the minimum positive or negative input pulse width for any one worst‐case channel required for proper propagation of an external signal to the receiver. tDIPW is mea‐ sured at the pins. tDIPW is independent of the PLL mode. In general tDIPW is larger than tDIVW. Upon completion of a burst, assuming no other WRITE data is expected on the bus the GDDR5 SGRAM DQ and DBI# pins will be driven according to the ODT state. Any additional input data will be ignored. Data for any WRITE burst may not be truncated with a subsequent WRITE command. Data from any WRITE burst may be concatenated with data from a subsequent WRITE command. A con‐ tinuous flow of data can be maintained. The first data element from the new burst follows the last element of a completed burst. The new WRITE command should be issued after the previous WRITE command according to the tCCD timing. If that WRITE command is to another bank then an ACTIVE command must precede the WRITE command and tRCDWR also must be met. A READ can be issued any time after a WRITE command as long as the internal turn around time tWTR is met. If that READ command is to another bank, then an ACTIVE command must precede the READ com‐ mand and tRCDRD also must be met. A PRECHARGE can also be issued to the GDDR5 SGRAM with the same timing restriction as the new WRITE command if tRAS is met. After the PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met. The data inversion flag is received on the DBI# pin to identify whether to store the true or inverted data. If DBI# is LOW, the data will be stored after inversion inside the GDDR5 SGRAM and not inverted if DBI# is HIGH. WRITE Data Inversion can be enabled (A9=0) or disabled (A9=1) using WDBI in MR1. When enabled by the WRCRC flag in MR4, EDC data are returned to the controller with a latency of (WLmrs + CRCWL) * tCK + tWCK2CKPIN + tWCK2CK + tWCK2DQO, where CRCWL is the CRC Write latency programmed in MR4 and tWCK2DQO is the WCK to DQ/DBI#/EDC phase offset at the DRAM pins.
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WLmrs CK# CK
tCH
tCL
tCK
tWCK2CKPIN + tWCK2CK WCK WCK# Case 1: Negative tWCK2DQI tWCK2DQI DQ/DBI# (mean) DQ/DBI# (first bit) DQ/DBI# (last bit) D0 D1 D2 D3 D4 D5 D6 D7 tDQDQI(min) D0 D1 D2 D3 D4 D5 D6 D7 tDQDQI(max) D0 D1 D2 D3 D4 D5 D6 D7
Case 2: Positive tWCK2DQI DQ/DBI# (mean) DQ/DBI# (first bit) DQ/DBI# (last bit)
tWCK2DQI D0 D1 D2 D3 D4 D5 D6 D7 tDQDQI(min) D0 D1 D2 D3 D4 D5 D6 D7 tDQDQI(max) D0 D1 D2 D3 D4 D5 D6 D7 Donʹt Care
1) WLmrs is the WRITE latency programmed in Mode Register MR0. 2) Timings are shown with positive tWCK2CKPIN and tWCK2CK values. See WCK2CK timings for tWCK2CKPIN and tWCK2CK ranges. 3) tWCK2DQI parameter values could be negative or positive numbers, depending on PLL‐on or PLL‐off mode operation and design implementation. They also vary across PVT. Data training is required to determine the actual tWCK2DQI value for stable WRITE operation. 4) tDQDQI defines the minimum to maximum variation of tWCK2DQI within a double byte (x32 mode) or a single byte (x16 mode). 5) Data Read timings are used for CRC return timing from WRITE commands with CRC enabled.
Figure 43. WRITE Timings
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T0 T1 T2 T3 T3n T4 T4n T5 T6 T7 T8
CK# CK
COMMAND
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
ADDRESS
Bank a, Col n
Col n
WL = WLmrs = 3 WCK
WCK# DQ
DO n DO n+7
DBI#
DBI n
DBI n+7
EDC
EDC Hold Pattern
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 3 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 4. Before the WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 5. tWCK2DQI = 0 is shown for illustration purposes.
Figure 44. Single WRITE without EDC
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T0
CK# CK
T1
T2
T3
T3n
T4
T4n
T5
(( )) (( ))
T11
T12
T13
COMMAND
WRITE
NOP
NOP
NOP
NOP
NOP
(( )) ( ( NOP )) (( )) (( ))
NOP
NOP
ADDRESS
Bank a, Col n
Col n
WL = WLmrs = 3 WCK
WCK# DQ
DO n DO n+7
(( )) (( )) (( ))
DBI#
DBI n
DBI n+7
(( ))
EDC
EDC Hold Pattern
(( )) (( ))
EDC n
EDC n+7
EDC Hold Pattern
CRCWL = 8
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 3 and CRCWL = 8 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 4. Before the WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 5. tWCK2DQI, tWCKDQO = 0 is shown for illustration purposes.
Figure 45. Single WRITE with EDC
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T0
CK# CK
T1
T2
(( )) (( ))
T5
T5n
T6
T6n
T7
(( )) (( )) (( )) (( )) (( )) (( ))
T10
T10n
T11
T11n
T12
COMMAND
WRITE
NOP
ACT
(( )) WRITE (( )) (( ) ) Bank b, ( ( Col n )) tRCDWR
NOP
NOP
NOP
NOP
NOP
ADDRESS
Bank a, Col m
Col m
Bank b, Row
Row
Col n
WL = WLmrs = 5 WCK
WCK# DQ
WL = WLmrs = 5
(( )) (( ))
(( )) (( )) (( ))
DO m DO m+7
(( ))
DO n
DO n+7
DBI#
(( ))
DBI m
DBI m+7
(( ))
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 5 and tRCDWR = 3 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 5. Before the WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 6. tWCK2DQI = 0 is shown for illustration purposes.
Figure 46. Non-Gapless WRITEs
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T0
CK# CK
T1
T2
T2n
T3
T3n
T4
T4n
T5
T5n
T6
T7
T8
COMMAND
WRITE
NOP
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
tCCD
ADDRESS
Bank a, Col m Col m Bank a, Col n Col n
WL = WLmrs = 2 WCK
WCK# DQ
WL = WLmrs = 2
DO m
DO m+7
DO n
DO n+7
DBI#
DBI m
DBI m+7
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 2 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tCCD = tCCDS when bank groups is disabled or the second WRITE is to a different bank group, otherwise tCCD=tCCDL. 5. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 6. Before the WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 7. tWCK2DQI = 0 is shown for illustration purposes.
Figure 47. Gapless WRITEs
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T0
CK# CK
WRITE NOP
T1
(( )) (( )) (( )) (( )) (( )) (( ))
T3
T3n
T4
T4n
T5
(( )) (( )) (( )) (( )) (( )) (( ))
Ta0
(( )) (( ))
Ta6
Ta6n
Ta7
Ta8
COMMAND
NOP
NOP
NOP
READ
(( )) NOP (( )) (( )) (( ))
NOP
NOP
ADDRESS
Bank a, Col m
Col m
Bank b, Col n
Col n
WL = WLmrs = 3 WCK
WCK# DQ
(( )) (( )) (( ))
DO m DO m+7
tWTR
CL = CLmrs = 6
(( )) (( )) (( )) (( )) (( )) (( ))
DO n DO n+7
DBI#
(( ))
DBI m
DBI m+7
(( ))
(( ))
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 3 and CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tWTR = tWTRL when bank groups is enabled and both WRITE and READ access banks in the same bank group, otherwise tWTR=tWTRS. 5. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 6. Before the READ and WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD or tRCDWR respectively must be met. 7. tWCK2DQI, tWCKDQO = 0 is shown for illustration purposes.
Figure 48. WRITE to READ
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T0
CK# CK
T1
T2
T3
T3n
T4
T4n
T5
T6
(( )) (( )) (( )) (( )) (( )) (( ))
Ta0
Ta1
COMMAND
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
PRE
NOP
tWR
ADDRESS
Bank a, Col n Col n
tRP
Bank a, or all
WL = WLmrs = 3 WCK
WCK# DQ
DO n DO n+7
(( )) (( )) (( ))
DBI#
DBI n
DBI n+7
(( ))
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 3 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 5. Before the WRITE command, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 6. tWCK2DQI = 0 is shown for illustration purposes.
Figure 49. WRITE to PRECHARGE
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5.8. WRITE DATA MASK (DM)
The traditional method of using a DM pin for WRITE data mask must be abandoned for a new method. Due to the high data rate of GDDR5 SGRAMs, bit errors are expected on the interface and are not recover‐ able when they occur on the traditional DM pin. In GDDR5 the DM is sent to the SGRAM over the address following the bank/column address cycle associ‐ ated with the command, during the NOP/DESELECT commands between the WRITE command and the next command. The DM is used to mask the corresponding data according to the following table.
Table 17: DM State
FUNCTION Write Enable Write Inhibit DM Value 0 1 DQ Valid X
Two additional WRITE commands that augment the traditional WRITE Without Mask (WOM) are required for proper DM support:
• WDM: WRITE‐With‐Doublebyte‐Mask:
2 cycle command where the 1st cycle carries address information and the 2nd cycle carries data mask information (2 byte granularity);
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WDM
CK# CK CKE# CS# LOW
RAS# CAS# WE#
A9 (A12) A1 A10,A11 A0,A6 A8 A7 BA0‐BA3 A2‐A5
CA
DM
DM
0,1
CA
DM
DM
EN AP DIS AP
DM
DM
BA
CA
DM
DM
BA = Bank Address; CA = Column Address; DM = Data Mask EN AP = Enable Auto‐Precharge; DIS AP = Disable Auto‐Precharge
Note: NOP shown as an example only
Figure 50. WRITE-With-Doublebyte-Mask Command
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T0
CK# CK
T1
T2
T2n
T3
T3n
T4
T4n
T5
T5n
T6
T7
T8
COMMAND
WDM
NOP
WDM
NOP
NOP
NOP
NOP
NOP
NOP
tCCD
ADDRESS
Bank a, Col m Col m DM m DM m Bank a, Col n Col n DM n DM n
WL = WLmrs = 2 WCK
WCK# DQ
WL = WLmrs = 2
DO m
DO m+7
DO n
DO n+7
DBI#
DBI m
DBI m+7
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 2 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tCCD = tCCDS when bank groups is disabled or the second WRITE is to a different bank group, otherwise tCCD=tCCDL. 5. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 6. Before the WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 7. tWCK2DQI = 0 is shown for illustration purposes.
Figure 51. WDM Timing
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• WSM: WRITE‐With‐Singlebyte‐Mask:
3 cycle command where the 1st cycle carries address information, the 2nd and 3rd cycle carry data mask information
WSM
CK# CK CKE# CS# LOW
RAS# CAS# WE#
A9 (A12) A1 A10,A11 A0,A6 A8 A7 BA0‐BA3 A2‐A5
CA
DM
DM
DM
DM
0,1
CA
DM
DM
DM
DM
EN AP DIS AP
DM
DM
DM
DM
BA
CA
DM
DM
DM
DM
BA = Bank Address; CA = Column Address; DM = Data Mask EN AP = Enable Auto‐Precharge; DIS AP = Disable Auto‐Precharge
Note: NOP shown as an example only
Figure 52. WRITE-With-Singlebyte-Mask Command
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T0
CK# CK
T1
T2
(( )) (( ))
T5
T5n
T6
T6n
T7
(( )) (( ))
T10
T10n
T11
T11n
T12
COMMAND
WSM
NOP
NOP
(( )) WSM (( )) (( ) ) Bank b, ( ( Col n ))
NOP
NOP
(( )) NOP (( )) ((
NOP
NOP
ADDRESS
Bank a, Col m
Col m
DM m
DM m
DM m
DM m
Col n
DM n
DM n
DM n
DM n ) )
(( ))
WL = WLmrs = 5 WCK
WCK# DQ
(( )) (( )) (( ))
DO m
WL = WLmrs = 5
(( )) (( ))
DO m+7
(( ) ) DO
n
DO n+7
DBI#
(( ))
DBI m
DBI m+7
(( ) ) DBI
n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 5 and tRCDWR = 3 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 5. Before the WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDWR must be met. 6. tWCK2DQI = 0 is shown for illustration purposes.
Figure 53. WSM Timing
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Table 18 WDM Mapping for mirrored & non‐mirrored x32 Mode Byte and Burst Position Masked during WDM
ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 ADR CK Rising Edge Byte DQ[15:0] DQ[15:0] DQ[15:0] DQ[15:0] DQ[31:16] DQ[31:16] DQ[31:16] DQ[31:16] Burst
0 1 2 3 0 1 2 3
ADR A0 A1 A2 A3 A4 A5 A6 A7
ADR CK# Rising Edge Byte DQ[15:0] DQ[15:0] DQ[15:0] DQ[15:0] DQ[31:16] DQ[31:16] DQ[31:16] DQ[31:16] Burst
4 5 6 7 4 5 6 7
Table 19 WDM Mapping for non‐mirrored x16 Mode Byte and Burst Position Masked during WDM
ADR CK Rising Edge ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 Byte DQ[7:0] DQ[7:0] DQ[7:0] DQ[7:0] DQ[23:16] DQ[23:16] DQ[23:16] DQ[23:16] Burst
0 1 2 3 0 1 2 3
ADR A0 A1 A2 A3 A4 A5 A6 A7
ADR CK# Rising Edge Byte DQ[7:0] DQ[7:0] DQ[7:0] DQ[7:0] DQ[23:16] DQ[23:16] DQ[23:16] DQ[23:16] Burst
4 5 6 7 4 5 6 7
Table 20 WDM Mapping for mirrored x16 Mode Byte and Burst Position Masked during WDM
ADR CK Rising Edge ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 Byte DQ[15:8] DQ[15:8] DQ[15:8] DQ[15:8] DQ[31:24] DQ[31:24] DQ[31:24] DQ[31:24] Burst
0 1 2 3 0 1 2 3
ADR A0 A1 A2 A3 A4 A5 A6 A7
ADR CK# Rising Edge Byte DQ[15:8] DQ[15:8] DQ[15:8] DQ[15:8] DQ[31:24] DQ[31:24] DQ[31:24] DQ[31:24] Burst
4 5 6 7 4 5 6 7
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Table 21 WSM Mapping for mirrored and non‐mirrored x32 Mode Byte and Burst Position Masked During WSM
ADR CK 1st rising Edge
ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 Byte DQ[7:0] DQ[7:0] DQ[7:0] DQ[7:0] DQ[23:16] DQ[23:16] DQ[23:16] DQ[23:16] Burst
0 1 2 3 0 1 2 3
ADR CK# 1st rising Edge
ADR A0 A1 A2 A3 A4 A5 A6 A7 Byte DQ[7:0] DQ[7:0] DQ[7:0] DQ[7:0] DQ[23:16] DQ[23:16] DQ[23:16] DQ[23:16] Burst
4 5 6 7 4 5 6 7
ADR CK 2nd rising Edge
ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 Byte DQ[15:8] DQ[15:8] DQ[15:8] DQ[15:8] DQ[31:24] DQ[31:24] DQ[31:24] DQ[31:24] Burst
0 1 2 3 0 1 2 3
ADR CK# 2nd rising Edge
ADR A0 A1 A2 A3 A4 A5 A6 A7 Byte DQ[15:8] DQ[15:8] DQ[15:8] DQ[15:8] DQ[31:24] DQ[31:24] DQ[31:24] DQ[31:24] Burst
4 5 6 7 4 5 6 7
Table 22 WSM Mapping for non‐mirrored x16 Mode Byte and Burst Position Masked During WSM
ADR CK 1st rising Edge
ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 Byte DQ[7:0] DQ[7:0] DQ[7:0] DQ[7:0] DQ[23:16] DQ[23:16] DQ[23:16] DQ[23:16] Burst
0 1 2 3 0 1 2 3
ADR CK# 1st rising Edge
ADR A0 A1 A2 A3 A4 A5 A6 A7 Byte DQ[7:0] DQ[7:0] DQ[7:0] DQ[7:0] DQ[23:16] DQ[23:16] DQ[23:16] DQ[23:16] Burst
4 5 6 7 4 5 6 7
ADR CK 2nd rising Edge
Byte ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Burst
0 1 2 3 0 1 2 3
ADR CK# 2nd rising Edge
Byte ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Burst
4 5 6 7 4 5 6 7
Table 23 WSM Mapping for mirrored x16 Mode Byte and Burst Position Masked During WSM
ADR CK 1st rising Edge Byte ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Burst
0 1 2 3 0 1 2 3
ADR CK# 1st rising Edge Byte ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ Burst
4 5 6 7 4 5 6 7
ADR CK 2nd rising Edge ADR A10 A9 BA0 BA3 BA2 BA1 A11 A8 Byte DQ[15:8] DQ[15:8] DQ[15:8] DQ[15:8] DQ[31:24] DQ[31:24] DQ[31:24] DQ[31:24] Burst
0 1 2 3 0 1 2 3
ADR CK# 2nd rising Edge ADR A0 A1 A2 A3 A4 A5 A6 A7 Byte DQ[15:8] DQ[15:8] DQ[15:8] DQ[15:8] DQ[31:24] DQ[31:24] DQ[31:24] DQ[31:24] Burst
4 5 6 7 4 5 6 7
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5.9. READ
A READ burst is initiated with a READ command as shown in Figure 54. The bank and column addresses are provided with the READ command and auto precharge is either enabled or disabled for that access with the A8 address. If auto precharge is enabled, the row being accessed is precharged at the completion of the burst after tRAS(min) has been met. The length of the burst initiated with a READ command is eight and the column address is unique for this burst of eight. There is no interruption nor truncation of READ bursts.
READ
CK# CK CKE# CS# RAS# CAS# WE# A10,A11 A0,A6 A9 (A12) A1 A8 A7 BA0‐BA3 A2‐A5
EN AP DIS AP
LOW
0,0
CA CA
BA
CA
BA = Bank Address; CA = Column Address EN AP = Enable Auto‐Precharge; DIS AP = Disable Auto‐Precharge
Figure 54. READ Command
During READ bursts, the first valid data‐out element will be available after the CAS latency (CL). The CAS Latency is defined as CLmrs * tCK + tWCK2CKPIN + tWCK2CK + tWCK2DQO, where CLmrs is the number of clock cycles programed in MR0, tWCK2CKPIN is the phase offset between WCK and CK at the pins when phase aligned at phase detector, tWCK2CK is the alignment error between WCK and CK at the GDDR5 SGRAM phase detector, and tWCK2DQO is the WCK to DQ/DBI#/EDC offset as measured at the DRAM pins. The total delay is relative to the data eye initial edge averaged over one double‐byte. The maximum skew within a double‐byte is defined by tDQDQO. Upon completion of a burst, assuming no other READ command has been initiated, all DQ and DBI# pins will drive a value of ʹ1ʹ and the ODT will be enabled at a maximum of 1 tCK later. The drive value and ter‐ mination value may be different due to separately defined calibration offsets. If the ODT is disabled, the pins will drive Hi‐Z. Data from any READ burst may be concatenated with data from a subsequent READ command. A contin‐ uous flow of data can be maintained. The first data element from the new burst follows the last element of a completed burst. The new READ command should be issued after the previous READ command accord‐ ing to the tCCD timing. If that READ command is to another bank then an ACTIVE command must pre‐ cede the READ command and tRCDRD also must be met.
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A WRITE can be issued any time after a READ command as long as the bus turn around time tRTW is met. If that WRITE command is to another bank, then an ACTIVE command must precede the second WRITE command and tRCDWR also must be met. A PRECHARGE can also be issued to the GDDR5 SGRAM with the same timing restriction as the new READ command if tRAS is met. After the PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met. The data inversion flag is driven on the DBI# pin to identify whether the data is true or inverted data. If DBI# is HIGH, the data is not inverted, and if LOW it is inverted. READ Data Inversion can be enabled (A8=0) or disabled (A8=1) using RDBI in MR1.
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When enabled by the RDCRC flag in MR4, EDC data is returned to the controller with a latency of (CLmrs + CRCRL) * tCK + tWCK2CKPIN + tWCK2CK + tWCK2DQO, where CRCRL is the CRC Read latency pro‐ grammed in MR4.
CLmrs CK# CK tWCK2CKPIN + tWCK2CK WCK WCK# Case 1: Negative tWCK2DQO tWCK2DQO DQ/DBI#/EDC (mean) DQ/DBI#/EDC (first bit) DQ/DBI#/EDC (last bit) D0 D1 D2 D3 D4 D5 D6 D7 tDQDQO(min) D0 D1 D2 D3 D4 D5 D6 D7 tDQDQO(max) D0 D1 D2 D3 D4 D5 D6 D7 tCH tCL tCK
Case 2: Positive tWCK2DQO DQ/DBI#/EDC (mean) DQ/DBI#/EDC (first bit) DQ/DBI#/EDC (last bit)
tWCK2DQO D0 D1 D2 D3 D4 D5 D6 D7 tDQDQO(min) D0 D1 D2 D3 D4 D5 D6 D7 tDQDQO(max) D0 D1 D2 D3 D4 D5 D6 D7 Donʹt Care
1) CLmrs is the CAS latency programmed in Mode Register MR0. 2) Timings are shown with positive tWCK2CKPIN and tWCK2CK values. See WCK2CK timings for tWCK2CKPIN and tWCK2CK ranges. 3) tWCK2DQO parameter values could be negative or positive numbers, depending on PLL‐on or PLL‐off mode operation and design implementation. They also vary across PVT. Data training is required to determine the actual tWCK2DQO value for stable READ operation. 4) tDQDQO defines the minimum to maximum variation of tWCK2DQO within a double byte (x32 mode) or a single byte (x16 mode). 5) tDQDQO also applies for CRC data from WRITE and READ commands with CRC enabled, the EDC hold pattern, and the data strobe in RDQS mode.
Figure 55. READ Word Lane Timing
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T0
CK# CK COMMAND
READ NOP NOP
T1
T2
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
T5
T6
T6n
T7
T7n
T8
T9
T10
NOP
NOP
NOP
NOP
NOP
NOP
ADDRESS
Bank a, Col n
Col n
CL = CLmrs = 6
WCK WCK# DQ
DO n
DO n+7
DBI#
DBI n
DBI n+7
ODT
ODT Enabled
(( )) (( )) (( )) (( ))
ODT Disabled
ODT Enabled
EDC
EDC Hold Pattern
DONʹT CARE
TRANSITIONING DATA
Notes: 1. CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. Before the READ command, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD must be met. 4. tWCK2DQO = 0 is shown for illustration purposes.
Figure 56. Single READ without EDC
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T0
CK# CK
T1
(( )) (( )) (( )) (( )) (( )) (( ))
T6
T6n
T7
T7n
T8
T9
T10
T10n
T11
T11n
T12
COMMAND
READ
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
ADDRESS
Bank a, Col n
Col n
CL = CLmrs = 6
WCK WCK# DQ
(( )) (( )) (( ))
DO n
DO n+7
DBI#
(( ))
DBI n
DBI n+7
EDC
(( )) (( ))
EDC Hold Pattern
EDC n
EDC n+7
EDC Hold Pattern
CRCRL = 4
DONʹT CARE
TRANSITIONING DATA
Notes: 1. CLmrs = 6 and CRCRL = 4 are shown as examples. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. Before the READ command, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD must be met. 4. tWCK2DQO = 0 is shown for illustration purposes.
Figure 57. Single READ with EDC
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T0
CK# CK
NOP
T1
(( )) (( )) (( )) (( )) (( )) (( ))
T3
(( )) (( ))
T6
T6n
T7
T7n
T8
T9
T9n
T10
T10n
T11
COMMAND
READ
READ
tCCD
ADDRESS
Bank a, Col m Col m
(( )) NOP (( )) (( )) (( ))
NOP
NOP
NOP
NOP
NOP
Bank b, Col n
Col n
CL = CLmrs = 6 WCK
WCK# DQ
CL = CLmrs = 6
(( )) (( )) (( )) (( )) (( )) (( ))
DO m DO m+7 DO n DO n+7
DBI#
(( ))
(( ))
DBI m
DBI m+7
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tCCD = tCCDL when bank groups are enabled and both READs access banks in the same bank group; otherwise tCCD=tCCDS. 5. Before the READ commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD must be met. 6. tWCK2DQI = 0 is shown for illustration purposes.
Figure 58. Non-Gapless READs
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T0
CK# CK
READ NOP READ NOP
T1
T2
T3
(( )) (( )) (( )) (( )) (( )) (( ))
T6
T6n
T7
T7n
T8
T8n
T9
T9n
T10
COMMAND
NOP
NOP
NOP
NOP
NOP
tCCD
ADDRESS
Bank a, Col m Col m Bank b, Col n Col n
CL = CLmrs = 6 WCK
WCK# DQ
(( )) (( )) (( ))
DO m DO m+7 DO n DO n+7
DBI#
(( ))
DBI m
DBI m+7
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tCCD = tCCDS when bank groups are disabled or the second READ is to a different bank group; otherwise tCCD=tCCDL. 5. Before the READ commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD must be met. 6. tWCK2DQI = 0 is shown for illustration purposes.
Figure 59. Gapless READs
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T0
CK# CK
T1
(( )) (( )) (( )) (( )) (( )) (( ))
T6
T6n
T7
T7n
T8
T9
T10
T10n
T11
T11n
T12
COMMAND
READ
NOP
NOP
WRITE
NOP
NOP
NOP
NOP
NOP
tRTW
ADDRESS
Bank a, Col m Col m
Bank b, Col n
Col n
CL = CLmrs = 6 WCK
WCK# DQ
(( )) (( )) (( ))
DO m
WL = WLmrs = 3
DO m+7
DO n
DO n+7
DBI#
(( ))
DBI m
DBI m+7
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. WLmrs = 3 and CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tWTR = tWTRL when bank groups is enabled and both WRITE and READ access banks in the same bank group, otherwise tWTR=tWTRS. 5. For WRITE operations it is important that the latching point meet the data valid window requirements, which may or may not be center aligned at the pins. 6. Before the READ and WRITE commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD or tRCDWR respectively must be met. 7. tWCK2DQI, tWCKDQO = 0 is shown for illustration purposes.
Figure 60. READ to WRITE
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T0
CK# CK
T1
T2
T3
T4
T5
T6
T6n
T7
T7n
T8
COMMAND
READ
NOP
PRE
NOP
NOP
NOP
NOP
NOP
NOP
tRTP
ADDRESS
Bank a, Col n Col n Bank a, or all
tRP
CL = CLmrs = 6 WCK
WCK# DQ
DO n DO n+7
DBI#
DBI n
DBI n+7
DONʹT CARE
TRANSITIONING DATA
Notes: 1. CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. tRTP = tRTPL when bank groups are enabled and the PRECHARGE command accesses the same bank; otherwise tRTP = tRTPS. 5. Before the READ commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD must be met. 6. tWCK2DQO = 0 is shown for illustration purposes.
Figure 61. READ to PRECHARGE
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5.10. DQ PREAMBLE
DQ preamble is a feature for GDDR5 SGRAMs that is used for READ data. DQ preamble conditions the DQs for better signal integrity on the initial data of a burst. Once enabled by bit 5 in MR7, the DQ preamble will precede all READ bursts, including non‐consecutive READ bursts with a minimum gap of 1 tCK, as shown in Figure 58. When enabled, the DQ preamble pat‐ tern applies to all DQ and DBI# pins in a byte, and the same pattern is used for all bytes as shown in Figure62. DQ preamble is enabled or disabled for all bytes. The EDC pin in each byte is not included in the DQ preamble. If ODT is enabled, the ODT is disabled 1 tCK before the start of the preamble pattern as shown in Figure 63. The preamble pattern on the DBI# pin is only enabled if the MR for RDBI is enabled (MR1 A8 bit). During the preamble the DBI# pin is treated as another DQ pin and the preamble pattern on the DQs is not encoded with RDBI. If RDBI is disabled, then the DBI# pin drives ODT.
Byte 0
DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 DBI0#
Byte 1
DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 DBI1#
Byte 2
DQ23 DQ22 DQ21 DQ20 DQ19 DQ18 DQ17 DQ16 DBI2#
Byte 3
DQ31 DQ30 DQ29 DQ28 DQ27 DQ26 DQ25 DQ24 DBI3# Max 0’s 1 1 1 1 1 1 1 1 1 0
Idle
1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 0 1 0 5
Preamble
1 0 1 0 1 0 1 0 1 4 0 1 0 1 0 1 0 1 0 5 1 0 1 0 1 0 1 0 1 4 x x x x x x x x x 4 x x x x x x x x x 4 x x x x x x x x x 4
Burst
x x x x x x x x x 4 x x x x x x x x x 4 x x x x x x x x x 4 x x x x x x x x x 4 x x x x x x x x x 4
Time
Notes: 1) The number of Max 0’s in the burst is 4 only if RDBI is enabled. Max 0‘s is on a per byte basis and does not include the EDC pin. 2) x = Valid Data
Figure 62. DQ Preamble Pattern
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T0
CK# CK COMMAND
READ NOP
T1
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
T4
T5
T5n
T6
T6n
T7
T7n
T8
T9
T10
NOP
NOP
NOP
NOP
NOP
NOP
NOP
ADDRESS
Bank a, Col n
Col n
CL = CLmrs = 6
WCK WCK# DQ6
DO n
DO n+7
DQ7
DO n
DO n+7
DBI#
DBI n
DBI n+7
ODT
ODT Enabled
(( )) (( ))
ODT Disabled
ODT Enabled
DONʹT CARE
TRANSITIONING DATA
Notes: 1. CLmrs = 6 is shown as an example. Actual supported values will be found in the MR and AC timings sections. 2. WCK and CK are shown aligned (tWCK2CKPIN=0, tWCK2CK=0) for illustration purposes. WCK2CK training determines the needed offset between WCK and CK. 3. EDC may be on or off. See Figure 4 for EDC Timing. 4. DQ6, DQ7 and the DBI# pin are shown to illustrate the DQ preamble pattern. RDBI is Enabled (MR1 A8=0). 5. Before the READ commands, an ACTIVE (ACT) command is required to be issued to the GDDR5 SGRAM and tRCDRD must be met. 6. tWCK2DQO = 0 is shown for illustration purposes.
Figure 63. Preamble Timing Diagram
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5.11. READ and WRITE DATA BUS INVERSION (DBI)
The GDDR5 SGRAM Data Bus Inversion (DBIdc) reduces the DC power consumption on data pins, as the number of DQ lines driving a low level can be limited to 4 within a byte. DBIdc is evaluated per byte. There is one DBI# pin per byte: DBI0# is associated with DQ0‐DQ7, DBI1# with DQ8‐DQ15, DBI2# with DQ16‐DQ23 and DBI3# with DQ24‐DQ31. The DBI# pins are bidirectional active Low double data rate (DDR) signals. For Writes, they are sampled by the GDDR5 SGRAM along with the DQ of the same byte. For Reads, they are driven by the GDDR5 SGRAM along with the DQ of the same byte. Once enabled by the corresponding RDBI Mode Register bit, the GDDR5 SGRAM inverts read data and sets DBI# Low, when the number of ’0’ data bits within a byte is greater than 4; otherwise the GDDR5 SGRAM does not invert the read data and sets DBI# High, as shown in Figure 64. Once enabled by the corresponding WDBI Mode Register bit, the GDDR5 SGRAM inverts write data received on the DQ inputs in case DBI# was sampled Low, or leaves the data non‐inverted in case DBI# was sampled High, as shown in Figure 65.
from DRAM core 8 8 DQ
’0’ count >4
from Mode Register: 0 = enabled 1 = disabled
DBI#
Figure 64. Example of Data Bus Inversion Logic for READs
8 DQ DBI# 8
to DRAM core
from Mode Register: 0 = enabled 1 = disabled
Figure 65. Example of Data Bus Inversion Logic for WRITEs
The flow diagram in Figure 66 illustrates the DBIdc operation. In any case, the transmitter (the controller for WRITEs, the GDDR5 SGRAM for READs) decides whether to invert or not invert the data conveyed on the DQs. The receiver (the GDDR5 SGRAM for WRITEs, the controller for READs) has to perform the reverse operation based on the level on the DBI# pin. Data input and output timing parameters are only valid with DBI being enabled and a maximum of 4 data lines per byte driven Low.
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Transmitter
Logical output data Determine ’0’ count in data byte
No DBI# = ’H’ Don’t invert data byte
’0’ count > 4 ?
Yes DBI# = ’L’ Invert data byte
DBI# = ’H’ Don’t invert data byte
DBI# = ’L’ Invert data byte
Receiver
Logical input data
Figure 66. DBI Flow Diagram
DBI# Pin Special Function Overview The DBI# pin has special behavior compared to DQ pins because of the ability to enable and disable it via MRS. For either WRITE or READ DBI# pin training, both DBI READ and DBI WRITE in MRS must be enabled. The behavior of the DBI# pin in various mode register settings is summarized below: If both DBI READ and DBI WRITE are enabled:
• Pin drives DBI FIFO data with RDTR command • DBI# pin FIFO accepts WRTR data with the WRTR command
If only DBI READ is enabled:
• DBI# pin drives ODT when not READ or RDTR
If only DBI WRITE is enabled:
• Pin always drives ODT (unless RESET)
If both DBI READ and DBI WRITE are disabled:
• DBI# pin drives ODT (unless RESET)
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5.12. ERROR DETECTION CODE (EDC)
The GDDR5 SGRAM provides error detection on the data bus to improve system reliability. The device generates a checksum per byte lane for both READ and WRITE data and returns the checksum to the con‐ troller. Based on the checksum, the controller can decide if the data (or the returned CRC) was transmitted in error and retry the READ or WRITE command. The GDDR5 SGRAM itself does not perform any error correction. The features of the EDC are:
• 8 bit checksum on 72 bits (9 channels x 8 bit burst) • dedicated EDC transfer pin per 9 channels (4x per GDDR5 SGRAM) • asymmetrical latencies on EDC transfer for Reads and Writes
The CRC polynomial used by the GDDR5 SGRAM is an ATM‐8 HEC, X^8+X^2+X^1+1. The starting seed value is set in hardware at “zero”. Table 24 shows the error types that are detectable and the detection rate.
Table 24 Error Correction Details
Error Type Random Single Bit Random Double Bit Random Odd Count Burst Vnew shown as an example of a voltage change
Figure 76. DVS Sequence
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5.22. TEMPERATURE SENSOR
GDDR5 SGRAMs incorporate a temperature sensor with digital temperature readout function. This func‐ tion allows the controller to monitor the GDDR5 SGRAM die’s junction temperature and use this informa‐ tion to make sure the device is operated within the specified temperature range or to adjust interface timings relative to temperature changes over time. The temperature sensor is enabled by bit A6 in Mode Register 7 (MR7). In this case the temperature read‐ out is valid after tTSEN. Hynix applies 10us to tTSEN. The temperature readout uses the DRAM Info mode feature. The digital value is driven asynchronously on the DQ bus following the MRS command to Mode Register 3 (MR3) that sets bit A7 to 1 and bit A6 to 0. The temperature readout will be continuously driven until an MRS command sets both bits to 0. The GDDR5 SGRAM’s junction temperature is linearly encoded as shown in Table 35. Hynix has the read‐ out to a subset of six digital codes out of Table 35, corresponding to six temperature thresholds.
Table 34 Temperature Sensor Readout Pattern
Binary Temperature Readout Temperature [°C] < 45 55 65 75 85 95 > 95 MF=0: DQ[5:0] MF=1: DQ[31:26] 000000 000001 000011 000111 001111 011111 111111
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5.23. DUTY CYCLE CORRECTOR (DCC)
As GDDR5 SGRAMs can operate with the PLL off during normal operation, the use of a Duty Cycle Cor‐ rector (DCC) can correct for the duty cycle of the WCK. DCC can be used at any time, however, rising and falling edges of WCK can be shifted according to the DCC type. The DCC should be enabled before WCK training and should be run for tDCC in order to effectively correct any error.
Table 35 DCC Timings
Parameter Required time for duty cycle corrector Symbol tDCC Min 150 Max ‐ Unit tCK
DCC can correct the duty cycle error within the range of ± 100ps.
WCK# WCK CK# CK CMD
NOP NOP MRS NOP NOP NOP NOP MRS MRS A.C.
tWCKTMRS
tMRD
tWCKTTR
tDCC
tLK
tMRD
DCC reset
Enter WCK2CK Training (reset WCK divide by circuits)
Start WCK2CK Phase Training
PLL Reset
Enter WCK2CK Training (sets data synchronizers, resets FIFO pointers)
DCC start DCC stop or not
Figure 77. Timing Diagram of DCC Control Signals
DCC control signals
• DCC reset : The DCC reset is used to initialize the DCC code and should be issued anytime before the WCK enables (MRS7 A11:1, A10:0) • DCC start : The DCC start is used to update the DCC code and should be issued anytime after the WCK is stable (MRS7 A11:0, A10:1) • DCC stop : The DCC stop is used to make it stop to update the DCC code while the DCC code is held. This should be issued after enough time from DCC start if needs (MRS7 A11:0, A10:0)
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 120
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Table 36 DCC Control Signals
A11 0 0 1 1 A10 0 1 0 1 DCC no DCC & DCC stop DCC start DCC reset RFU
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 121
H5GQ1H24AFR 6. OPERATING CONDITIONS
6.1. ABSOLUTE MAXIMUM RATINGS
Voltage on Vdd Supply Relative to Vss................................................... ‐0.5V to +2.0V Voltage on VddQ Supply Relative to Vss .................................................. ‐0.5V to +2.0V Voltage on Vref and Inputs Relative to Vss .................................................. ‐0.5V to +2.0V Voltage on I/O Pins Relative to Vss .................................................. ‐0.5V to VddQ +0.5V Storage Temperature (plastic) ............................ ‐55°C to +150°C Short Circuit Output Current ............................. 50mA
*Stresses greater than those listed 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.
Table 37 Capacitance
PARAMETER Delta Input/Output Capacitance: DQs, DBI#, EDC, WCK, WCK# Delta Input Capacitance: Command and Address Delta Input Capacitance: CK, CK# Input/Output Capacitance: DQs, DBI#, EDC, WCK, WCK# Input Capacitance: Command and Address Input Capacitance: CK, CK#, WCK, WCK# Input Capacitance: CKE# SYMBOL DCio DCi1 DCi2 Cio Ci1 Ci2 Ci3 MIN 0 0 0 1.2 0.9 0.9 0.9 MAX 0.5 0.5 0.3 1.9 1.6 1.6 1.6 UNITS pF pF pF pF pF pF pF NOTES
Table 38 Thermal Characteristics
Parameter Description Value 45
1s Theta_JA 2s2p Theta_JB Theta_JC
o
Units C/W 1,2,4,5
Notes
Thermal resistance junction to ambient
33 30
oC/W oC/W o
1,4,5 (at Tc 115oC) 1,2,4,5 1,3 1,6
Thermal resistance junction to board Thermal resistance junction to case
12 3
C/W
oC/W
Notes: 1. Measurement procedures for each parameter must follow standard procedures defined in the current JEDEC JESD‐51 standard. 2. Theta_JA measured with the low and high thermal conductivity test board defined in JESD51‐9 This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 122
H5GQ1H24AFR
3. Theta_JB measured with the special boundary condition defined in JESD51‐8 4. Theta_JA should only be used for comparing the thermal performance of single package and not for system related junction. 5. Theta_JA is the natural convection junction‐to‐ambient air thermal resistance measured in one cubic foot sealed enclosure as decribed in JESD 51‐2. The environment is sometimes refered to as “still‐air” although natural convection causes the air to move. 6. Theta_JC case surface is defined as the “outside surface of the package (case) closest to the chip mounting area when that same surface is properly hear sunk” so as to minimize temperature variation across that surface.
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any responsability for use of circuits described. No patent licenses are implied. Rev. 1.0 /Nov. 2009 123
H5GQ1H24AFR
6.2. AC & DC CHARACTERISTICS
All GDDR5 SGRAMs are designed for 1.5V typical voltage supplies. The interface of GDDR5 with 1.5V VDDQ will follow the POD15 specification. All AC and DC values are measured at the ball.
Table 39 DC Operating Conditions
Parameter
Device Supply Voltage Output Supply Voltage Device Supply Voltage Output Supply Voltage Reference Voltage for DQ and DBI# pins Reference Voltage for DQ and DBI# pins External Reference Voltage for address and command DC Input Logic HIGH Voltage for address and command DC Input Logic LOW Voltage for address and command DC Input Logic HIGH Voltage for DQ and DBI# pins with VREFD DC Input Logic LOW Voltage for DQ and DBI# pins with VREFD DC Input Logic HIGH Voltage for DQ and DBI# pins with VREFD2 DC Input Logic LOW Voltage for DQ and DBI# pins with VREFD2 Input Logic HIGH Voltage for RESET#, SEN, MF Input Logic LOW Voltage for RESET#, SEN, MF Input logic HIGH voltage for EDC1/2 (x16 mode detect) Input logic LOW voltage for EDC1/2 (x16 mode detect) Input Leakage Current Any Input 0V