协议学习:ddr:ddr3_to_ddr4
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协议学习:ddr:ddr3_to_ddr4 [2022/12/27 08:57] – 创建 zhangguo | 协议学习:ddr:ddr3_to_ddr4 [2023/03/17 10:12] (当前版本) – 外部编辑 127.0.0.1 | ||
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====== DDR3 to DDR4 ====== | ====== DDR3 to DDR4 ====== | ||
+ | |||
+ | https:// | ||
DDR4 – Advantages of Migrating from DDR3 | DDR4 – Advantages of Migrating from DDR3 | ||
行 6: | 行 8: | ||
DDR4 is the next evolution in DRAM, bringing even higher performance and more robust control features while improving energy economy for enterprise, micro-server, | DDR4 is the next evolution in DRAM, bringing even higher performance and more robust control features while improving energy economy for enterprise, micro-server, | ||
- | ^ Feature/ | + | ^ Feature/ |
- | | Voltage (core and I/O) | + | | Voltage (core and I/O) | 1.5V | 1.2V | Reduces memory power demand |
- | | VREF inputs | + | | VREF inputs |
- | | Low voltage standard | + | | Low voltage standard |
- | | Data rate (Mb/ | + | | Data rate (Mb/ |
- | | Densities | + | | Densities |
- | | Internal banks | + | | Internal banks | 8 | 16 | More banks | |
- | | Bank groups (BG) | + | | Bank groups (BG) | 0 | 4 | Faster burst accesses |
- | | tCK – DLL enabled | + | | tCK – DLL enabled |
- | | t CK – DLL disabled | + | | t CK – DLL disabled |
- | | Read latency | + | | Read latency |
- | | Write latency | + | | Write latency |
- | | DQ driver (ALT) | 40Ω | 48Ω | + | | DQ driver (ALT) | 40Ω | 48Ω | Optimized for PtP (point-to-point) applications |
- | | DQ bus | + | | DQ bus | SSTL15 |
- | | RTT values (in Ω) | 120, 60, 40, 30, 20 | 240, 120, 80, 60, 48, 40, 34 | Support higher data rates | | + | | RTT values (in Ω) | 120, 60, 40, 30, 20 | 240, 120, 80, 60, 48, 40, 34 | Support higher data rates | |
- | | RTT not allowed | + | | RTT not allowed |
- | | ODT modes | Nominal, dynamic | + | | ODT modes | Nominal, dynamic |
- | | ODT control | + | | ODT control |
- | | Multipurpose register (MPR) | Four registers – 1 defined, 3 RFU | Four registers – 3 defined, 1 RFU | + | | Multipurpose register (MPR) | Four registers – 1 defined, 3 RFU | Four registers – 3 defined, 1 RFU | Provides additional specialty readout |
协议学习/ddr/ddr3_to_ddr4.1672102677.txt.gz · 最后更改: 2023/03/17 10:12 (外部编辑)