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AT INTERFACE and ATA COMMANDS
6-6-3
Non-Data Commands
This class includes:
• Execute Drive Diagnostic (DRDY=x) (90h)
• Idle (97h,E3h)
• Idle Immediate (95h,E1h)
• Initialize Drive Parameters (DRDY=x) (91h)
• Check Power Mode (98h,E5h)
• Read Verify Sector(s) (40h)
• Recalibrate (1Xh)
• Seek (7Xh)
• Set Features (EFh)
• Set Multiple Mode (C6h)
• Sleep (99h,E6h)
• Standby (96h,E2h)
• Standby Immediate (94h,E0h)
Execution of these commands involves no data transfer.
a) The host writes any required parameters to the Features, Sector Count, Sector
Number, Cylinder and Drive/Head registers.
b) The host writes the command code to the Command Register.
c) The drive sets BSY.
d) When the drive has completed processing, it clears BSY and asserts INTRQ.
e) The host reads the Status Register.
f) The drive negates INTRQ.
WA31273A / WA32543A / WA33203A / WA32163A / WA31083A / WA32162A 6-45
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