2 Replies Latest reply on Apr 19, 2017 4:34 AM by noskov.sergey

Depth Expansion of DDR2+ SRAM

noskov.sergey Sep 21, 2016 1:43 AM

Hello. I need guidelines for depth expansion of two DDR2+ SRAMs.

1. Re: Depth Expansion of DDR2+ SRAM

gsns Nov 23, 2016 1:52 AM (in response to noskov.sergey)
Hi Noss,

I am attaching a file showing how to connect two DDR2+ SRAMs in depth expansion. Please check the attached file.

Thanks.

DDR II Depth Expansion.pdf 235.6 K
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2. Re: Depth Expansion of DDR2+ SRAM

noskov.sergey Apr 19, 2017 4:34 AM (in response to gsns)

Hi Krishna,

Thanks for reference schematic. Signals CQ/CQ# from 2_DDR II+ are not connected. I can calculate the worst-case data valid window (DVW) when reading from 1_DDR II+ :

DVW = tCQHCQH - tCQHQV + tCQHQX.

How can I calculate the worst-case data valid window, when reading from 2_DDR II+, if I use echo clocks from 1_DDR II+ to capture data?
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