I am writing a interface about the ata interface but I have a problem that the dma request signal is sometimes always high when power up,and the hardware reset didn't work.So I don't have idea that what is the problem.Also I try the samsung hard disk drivers,and the hardware reset can reset the dma request signal to '0'!
hard disk drivers problem
May 29, 2006
2 Replies
If by "hardware reset" you mean the reset signal on the ATA interace, don't expect too much of it. The name is misleading, it does nothing near what a power cycling reset will do - and it may vary between vendors, especially when it comes to DMA and ATAPI combined (fortunately, ATAPI provides fast transfer mechanisms in PIO mode...).
Dimiter
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bjzhangwn schrieb:
check your power-up sequence ... the drive should go to a ready-state after delay and status-polling. The procedure from the sepc just works fine for me and I never had an issue with *that* ...
bye, Michael
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