Low performance of the IDE on the SIS550

Yves Godin Yves.Godin at lyrtech.com
Thu Oct 3 17:10:00 CEST 2002

At 01:24 PM 10/3/02 -0500, you wrote:
>Yves Godin wrote:
>>Anyway, with the UDMA mode 2 I should have the performance that I need. I 
>>look on header of the ide connector and the burst when writing seems to 
>>be quick anough but between each of these bursts I have a hole of 5-6 seconds.
>How are you looking at the ide header? Logic Analyzer, scope?? If so, are 
>you saying that the dma burst timing looks good but you are getting pauses 
>of 5 -6 seconds between bursts?

I`am looking the DRQ signal on th ide header with a scope. Now I'm getting 
pauses of 2-3 seconds in writing. It`s weird because I don`t observe this 
on a P133 which is slower that the SIS550 and the read seems ok.

Do you have a board with a SIS550 to compare my results  ?


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