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Parameter write
~
a
BSY
DRDY
DRQ
INTRQ
Data transfer
Expanded
Command
Min. 30 s (*1)
DRQ
INTRQ
Data Reg.
Selection
Data
IOR-
Word
IOCS16-
*1 When the IDD receives a command that hits the cache data during read-ahead, and
transfers data from the buffer without reading from the disk medium.
Figure 5.2
Even if the error status exists, the drive makes a preparation (setting the DRQ bit) of data
transfer. It is up to the host whether data is transferred. In other words, the host should
receive the data of the sector (512 bytes of uninsured dummy data) or release the DRQ by
resetting.
Command
Status read
b
c
e
d
0
1
Read Sector(s) command protocol
C141-E056-01EN
Status read
• • • •
e
f
d
• • • •
• • •
• • • •
• • • •
• • • •
2
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