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DDR4-SDRAM协议原版下载
1. Scope 1
2. DDR4 SDRAM Package Pinout and Addressing ............ 2
2.1 DDR4 SDRAM Row for X4,X8 and X16 ........2
2.2 DDR4 SDRAM Ball Pitch......2
2.3 DDR4 SDRAM Columns for X4,X8 and X16 ..2
2.4 DDR4 SDRAM X4/8 Ballout using MO-207. 2
2.5 DDR4 SDRAM X16 Ballout using MO-207.....3
2.6 Pinout Description ...5
2.7 DDR4 SDRAM Addressing...7
3. Functional Description 8
3.1 Simplified State Diagram ..8
3.2 Basic Functionality...9
3.3 RESET and Initialization Procedure 10
3.3.1 Power-up Initialization Sequence .....10
3.3.2 Reset Initialization with Stable Power ...........11
3.4 Register Definition .12
3.4.1 Programming the mode registers .....12
3.5 Mode Register .......13
4. DDR4 SDRAM Command Description and Operation.. 24
4.1 Command Truth Table........24
4.2 CKE Truth Table ....25
4.3 Burst Length, Type and Order .........26
4.3.1 BL8 Burst order with CRC Enabled .26
4.4 DLL-off Mode & DLL on/off Switching procedure .....27
4.4.1 DLL on/off switching procedure .......27
4.4.2 DLL “on” to DLL “off” Procedure ......27
4.4.3 DLL “off” to DLL “on” Procedure ......28
4.5 DLL-off Mode.........29
4.6 Input Clock Frequency Change.......30
4.7 Write Leveling........31
4.7.1 DRAM setting for write leveling & DRAM termination function in that mode .....32
4.7.2 Procedure Description ........33
4.7.3 Write Leveling Mode Exit ....34
4.8 Temperature controlled Refresh modes .......34
4.8.1 Normal temperature mode ..34
4.8.2 Extended temperature mode ........... 34
4.9 Fine Granularity Refresh Mode .......35
4.9.1 Mode Register and Command Truth Table ...35
4.9.2 tREFI and tRFC parameters ............35
4.9.3 Changing Refresh Rate ......36
4.9.4 Usage with Temperature Controlled Refresh mode... 36
4.9.5 Self Refresh entry and exit ..37
4.10 Multi Purpose Register .....37
4.10.1 DQ Training with MPR ......37
4.10.2 MR3 definition ......37
4.10.3 MPR Reads.......... 38
4.10.4 MPR Writes.......... 40
4.10.5 MPR Read Data format .....43
4.11 Data Mask(DM), Data Bus Inversion (DBI) and TDQS.........48
4.12 ZQ Calibration Commands............50
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