Fujitsu MPC3096AT Product Manual - Page 120
Read Sectors command protocol
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Command Parameter write ~ bc a BSY DRDY d DRQ Status read e f d Status read e INTRQ Data transfer Expanded Command Min. 30 µs (*1) DRQ INTRQ Data Reg. Selection Data IOR- Word 0 1 IOCS16- • • • 2 255 *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 5.3 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. C141-E055-01EN 5 - 57
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C141-E055-01EN
5 - 57
Status read
Status read
*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.
255
2
1
0
Word
IOCS16-
IOR-
Data
Data Reg.
Selection
INTRQ
DRQ
Min. 30
μ
s (*1)
Expanded
Command
f
d
d
e
e
c
b
a
Command
BSY
INTRQ
DRDY
~
Parameter write
DRQ
Data transfer
• • • •
• • • •
• • •
• • • •
• • • •
• • • •
Figure 5.3
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.