
116 The Essential Guide to Serial ATA and SATA Express
Register 76543210
Features Subcommand code
Sector Count Sector count (low order)
LBA Low Sector count (high order)
LBA Mid 00h
LBA High 00h
Device obs na obs DEV 0000
Command 92h
Device register –
DEV will specify the selected device.
Normal outputs
Register 76543210
Error na
Sector Count na
LBA Low na
LBA Mid na
LBA High na
Device obs na obs DEV na na na na
Status BSY DRDY DF na DRQ na na ERR
Device register –
DEV will indicate the selected device.
Status register –
BSY will be cleared to zero, indicating command completion.
DRDY will be set to one.
DF (Device Fault) will be cleared to zero.
DRQ will be cleared ...