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Question about the altera an495

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cgha

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It is about the ata host pio mode core.
Now i can get it run with my toshiba 20GB hdd, but no luck with my SamSung 80GB and hitachi 40GB hdd,the problem is the status i read from the 80GB and 40GB hdd is always wrong,here i did not use the dstrb,because i see this signal is generated by the ata core but not device. but these two hdd can be initialized sucessfully by my s3c44b0 evl board using PIO mode.
can anyone here help me?
Thanks!

Chris
 

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