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SRAM Forum Discussions

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

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Anonymous
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Hi Noss,

   

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

   

Thanks.

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Anonymous
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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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