This is my first post in this forum.
If anybody has worked on ATA-3 protocol for hard diks drives,then g ahead with description:
Currently i am working on ATA protocol[PIO mode] for hard drives. I am facing a problem while executing Identify device command.I a performing the flow as per flow mentioned in ATA datasheet as follows:1) reading status register and checking for BSY bit. I am getting it lo whenever hard disk is not busy. So that is fine 2)Now selecting device by setting dev bit low. I am setting it low becaus it's status should match with the cable_Select pin. In my hardware cabl select is connected to ground. So i am writing A0h in device/hea register. 3)Reading the status register and checking for BSY and DRDY bits. I a getting BSY = 0 and DRDY = 1. So it is ok. 4)Writing command ECh in command register.[Identify Device = ECh]. 5) Checking for Error bit in status register and BSY bit also. I a getting BSY low and ERR bit low. That means no error has occured till now. 6) no I am checking for DRQ bit. But i am not getting DRQ = 1 as per th flow mentioned in ATA-3 Datasheet. Even if I ignore DRQ bit, and start reading data register, i always ge FF00, which is not as per outputs mentioned in datasheet for Identif device command. I am getting all 256 words as FF00h only.
So i am facing this problem for last seven days and i am not getting an proper documents on internet to sort out this issue.If any body can suppor me in sorting out this issue,please support me for this.
Thanks and Regards. Ravi