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How to design large SDRAM board with tigersharc?

Started by Liang Xingdong May 25, 2004
Dear members,
My question is how to use large SDRAM, for example 1GB, in tigersharc based DSP board. It seems that Tigersharc only supports 64MB SDRAM at most.
 
 
 
Liang
 




On Tue, 25 May 2004, [gb2312] Liang Xingdong wrote:

> Dear members,
> My question is how to use large SDRAM, for example 1GB, in tigersharc
>based DSP board. It seems that Tigersharc only supports 64MB SDRAM at
>most.

You will need to bank switch. Dedicate a section of external address
space for control, and use that to select which bank of 64M you will talk
to at a time. You'll need 1000/64 = 16 banks. A fast CPLD will work fine
for this.

Patience, persistence, truth,
Dr. mike