[SI-LIST] Re: SDRAM timing

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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