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5.3 Host Commands
C141-E042-01EN 5-31
At command issuance (I/O registers setting contents)
1F7
H
(CM) 10010001
1F6
H
(DH)
×××
DV Max. head No.
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
xx
xx
xx
Number of sectors/track
xx
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status information
1F6
H
(DH)
×××
DV Max. head No.
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
xx
xx
xx
Number of sectors/track
Error infomation
(12) IDENTIFY DEVICE (X’EC’)
The host system issues the IDENTIFY DEVICE command to read parameter
information (512 bytes) from the device. Upon receipt of this command, the drive
sets the BSY bit of Status register and sets required parameter information in the
sector buffer. The device then sets the DRQ bit of the Status register, and
generates an interrupt. After that, the host system reads the information out of the
sector buffer. Table 5.4 shows the arrangements and values of the parameter
words and the meaning in the buffer.