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DDR4内存

JESD79‑4C

2020年1月

联合电子设备工程委员会

标准

JEDEC固态技术协会

（JESD79‑4B修订版，2017年6月）

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JEDEC标准号79‑4C

1.范围............................................................................................................................................................................................................12.DDR4SDRAM封装引脚排列和寻

址.........................................................................................................................12.1X4、X8和X16的DDR4SDRAM

行........................................................................................................................12.2DDR4SDRAM球间

距...................................................................................................................................................12.3X4、X8和X16的DDR4SDRAM

列.......................................................................................................................12.4使用MO‑207的DDR4SDRAMX4/8

Ballout....................................................................................................................22.5使用MO‑207的DDR4SDRAMX16

Ballout.....................................................................................................................32.6使用MO‑XXX的DDR4SDRAMX32

Ballout......................................................................................................................................42.7引脚排列说

明............................................................................................................................................................................52.8DDR4SDRAM寻

址.....................................................................................................................................................72.9DDP单列(SR)x16来自两个

x8.......................................................................................................................................83.功能说

明.....................................................................................................................................................................................103.1简化状态

图.............................................................................................................................................................103.2基本功

能............................................................................................................................................................113.3RESET和初始化程

序............................................................................................................................113.3.1上电初始化序列......................................................................................................................11

3.3.2上电初始化序列时的VDD压摆率.........................................................................................143.3.3稳定电源复位初始

化............................................................................................................143.4寄存器定

义..............................................................................................................................................................................153.4.1模式寄存器编

程...................................................................................................................................153.5模式寄存

器.............................................................................................................................................................................................184.DDR4SDRAM命令说明及操

作.....................................................................................................................................294.1命令真值

表....................................................................................................................................................................................294.2CKE真值

表............................................................................................................................................................................304.3突发长度、类型和顺

序.............................................................................................................................................................314.3.1启用CRC的BL8突发顺

序........................................................................................................................314.4DLL‑off模式和DLL开/关切换程

序.............................................................................................................324.4.1DLL开/关闭切换程

序.......................................................................................................................................................324.4.2DLL“开”到DLL“关”的过

程......................................................................................................................................324.4.3DLL“关闭”至DLL“开启”程

序.......................................................................................................................................334.5DLL关闭模

式...................................................................................................................................................................................................344.6输入时钟频率变

化................................................................................................................................................................354.7写入均

衡............................................................................................................................................................................364.7.1该模式下写入均衡和DRAM终止功能的DRAM设

置.......................................................374.7.2程序说明.............................................................................................................................................384.7.3退出写均衡模

式.............................................................................................................................................394.8温控刷新模

式......................................................................................................................................394.8.1常温模式（0°C=<TCASE=<

85°C）......................................................................................394.8.2扩展温度模式(0°C=<TCASE=<95°C).......................................................................394.9细粒度

刷新模式...............................................................................................................404.9.1模式寄存器和命令真值

表.............................................................................................................................404.9.2tREFI和tRFC参

数.............................................................................................................................................404.9.3更改刷新

率.......................................................................................................................................414.9.4与温控刷新模式一起使

用..............................................................................................................424.9.5自刷新进入和退

出................................................................................................................................................434.10多功能寄存

器......................................................................................................................................................434.10.1DQ培训

MPR.......................................................................................................................................434.10.2MR3定

义.............................................................................................................................................................434.10.3MPR读

取.............................................................................................................................................444.10.4MPR写

入..............................................................................................................................................................464.10.5MPR读取数据格

式.....................................................................................................................................494.11数据掩码(DM)、数据总线反转(DBI)和

TDQS.......................................................................................................54

‑我

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