Command
Parameter write
~ | b c |
a
BSY
DRDY
DRQ
INTRQ
Data transfer
Expanded
Command
Min. 30 μs (*1)
DRQ
INTRQ
Data Reg.
Selection
Data
IOR-
Word 
0
IOCS16-
Status read |
|
|
| Status read |
|
|
|
|
|
e |
|
| • • • • | e |
|
|
| ||
d | f |
| d | |
• • • •
• • •
• • • •
• • • •
• • • •
1 | 2 | 255 |
*1 When the IDD receives a command that hits the cache data during
Figure 5.2 Read Sector(s) command protocol
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.
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