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zhangfuwen
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vault backup: 2025-10-24 18:57:34
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Notes/001-modern-computing/023-memory.md

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@@ -88,7 +88,8 @@ Page size: 差别比较大,有1K的也有4K的。
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LPDDR5X有四个power rail。VDDQ是外围电路。VDD2L也是外围电路。VDD2H和VDD1主要是在bank上。
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![](assets/Pasted%20image%2020251024175542.png)
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现有方案中,VDD2L和VDD2H的分离已经能带来一些功耗下降。镁光提了一个更低VDD2H的方案,能进一步降低
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现有方案中,VDD2L和VDD2H的分离已经能带来一些功耗下降。镁光提了一个更低VDD2H的方案,能进一步降低功耗8%左右。 [How does voltage scaling enable LPDDR5X to deliver efficient AI user experiences? \| Micron Technology Inc.](https://www.micron.com/about/blog/memory/dram/how-does-voltage-scaling-enable-lpddr5x-to-deliver-efficient-ai-user-experiences)这个大概是能将VDD2H从1.060V 降到 0.98V。
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## UFS
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UFS 4的理论带宽是4GB/s,它有2个lane(差分线对),单个差分线对速度是23.2GT/s(不算头部开销理论传输速度是5.8GB/s).

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