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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
85
Execution includes the transfer of one or more 512 byte (>512 bytes on Write Long) sectors of data from the
drive to the host.
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 DRQ when it is ready to accept the first sector of data.
d) The host writes one sector of data via the Data register.
e) The drive clears DRQ and sets BSY.
f) When the drive has completed processing of the sector, it clears BSY and asserts INTRQ. If transfer of
another sector is required, the drive also sets DRQ.
g) After detecting INTRQ, the host reads the Status registers.
h) The drive clears the interrupt.
i) If transfer of another sector is required, the above sequence is repeated from (d).
6.6.2.1 PIO Write Command
a) b) e) e)
Setup Issue Transfer Read Transfer Read
Command Data Status Data ==== Status
BSY=0 BSY=1 BSY=0 BSY=1 BSY=0 BSY=1 BSY=0
DRDY=1
DRQ=1
DRQ=0
DRQ=1
DRQ=0
Assert Negate Assert Negate
INTRQ INTRQ INTRQ INTRQ
6.6.2.2 PIO Write Aborted Command
a) b) e)
Setup Issue Read
Command Status
BSY=0 BSY=1 BSY=0
DRDY=1
Assert Negate
INTRQ INTRQ