a question on dram timing \ VOGONS

a question on dram timing

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First post, by noshutdown

Posted on 2026-03-26, 07:16

noshutdown Offline

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Joined: 2010-07-23, 17:04
Location: China

for a typical async dram timing like 4-2-2-2, 6-3-3-3 etc, does the first read clocks include the cool down(ras precharge) waiting after the previous read cycle, or just the rated reading time from scratch to data valid?

Reply 1 of 1, by mkarcher

Posted on 2026-03-26, 11:40

mkarcher Offline

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Joined: 2019-01-19, 16:29
Location: Germany

Typically, the quoted timings (as you can select them in the chipset setup) are for "page hit", that is the requied page is already open, which means /RAS is already active. There are two further scenarios: No page is open, so the row setup+hold time needs to be added, and the worst case, a different page is open, in which the RAS precharge time needs to be added as well.

Read the chip set datasheet (if available) for full timing information.

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