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CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
6.39 Standby Immediate (94h or E0h)
This command causes the Drive to set BSY, enter the Sleep mode (which corresponds to the ATA Standby Mode),
clear BSY and return the interrupt immediately. Recovery from Sleep mode is accomplished by issuing another
command. Table 62 defines the Standby Immediate Byte sequence.
Table 62: Standby Immediate
Task File Register
7
6
5
4
3
2
1
0
COMMAND
94h or E0h
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
nu
nu
nu
6.40 Translate Sector (87h)
This command is effectively a NOP command and only implemented for backward compatibility. The Sector
Count Register will always be returned with a ‘00h’ indicating Translate Sector is not needed.
Table 63: Translate Sector
Task File Register
7
6
5
4
3
2
1
0
COMMAND
87h
DRIVE/HEAD
1
LBA
1
D
Head (LBA 27:24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
Cylinder High (LBA23:16)
Cylinder Low (LBA15:8)
nu (LBA7:0)
nu
nu
6.41 Write Buffer (E8h)
The Write Buffer command enables the host to overwrite contents of the Drive ’s sector buffer with any data
pattern desired. This command has the same protocol as the Write Sector(s) command and transfers 512 Bytes.
Table 64: Write Buffer
Task File Register
7
6
5
4
3
2
1
0
COMMAND
E8h
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
nu
nu
nu
6.42 Write DMA (CAh, CBh)
This command uses DMA mode to write from 1 to 256 sectors as specified in the Sector Count register. A sector
count of 0 requests 256 sectors. The transfer begins at the sector specified in the Sector Number Register. When
this command is issued the Drive sets BSY, puts all or part of the sector of data in the buffer. The Drive is then
permitted, although not required, to set DRQ, clear BSY. The Drive asserts DMAREQ while data is available to be
transferred. The host then writes the (512 * sector-count) bytes of data to the Drive using DMA. While DMAREQ is
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