[SI-LIST] Re: SDRAM timing
- From: Mike Brown <bmgman@xxxxxxxxxx>
- To: peter.zhu@xxxxxxxxxx
- Date: Fri, 26 Nov 2004 22:49:43 -0600
Peter,
You are half right. Long path (setup) timing is determined by the longest data
bus. You fail to consider the short path (hold) timing, and you will get a
really nasty surprise some time after the design is released to the customer by
doing so.
Mike
peter zhu wrote:
> Hi, all:
>
> I oftem see designer reel the PCB trace for equivalent length in SDRAM data
> bus. I am very puzzled about it all the time I think, for SDRAM data bus,
> there is on need for equivalent trace length in SDRAM data bus. The timing
> is determined by the longest data bus. For other SDRAM data bus, the short,
> the better, and no need for equivalent. Do you think so?
>
> Also where can I find some detailed guide for SDRAM and DDR tracing?
>
> Thanks in advanced
>
> Peter
>
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