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11.8.28 Read Buffer (E4h)
COMMAND CODE
1 1 1 0 0 1 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY no change
HD no change
SN no change
SC 00H
FT no change
This command transfers a specified sector of data ( 512 bytes) from the 128kB buffer in the drive to the host.
When this command is issued, the drive sets BSY, sets up the buffer for read operation, sets DRQ, resets
BSY, and generates an interrupt. The host reads up to 512 bytes of data from the buffer.
11.8.29 Write Buffer (E8h)
COMMAND CODE
1 1 1 0 1 0 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY no change
HD no change
SN no change
SC 00H
FT no change
This command transfers a sector of data from the host to the specified 512 bytes of 128kB buffer of the
drive . When this command is issued, the drive will set up the buffer for write operation, and set DRQ. The
host may then write up to 512 bytes of data to the buffer.
11.8.30 Identify Device (ECh)
COMMAND CODE
1 1 1 0 1 1 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY no change
HD no change
SN no change
SC 00H
FT no change
The identify device command requests the drive to transfer parameter information to the host. When the
command is issued, the drive sets BSY, stores the required parameter information in the sector buffer, sets
the DRQ bit, and issues an interrupt. The host may read the parameter information of the sector buffer.
The parameter words in the buffer are arranged as shown in Table 11.8-1 ~ Table 11.8-5.