Fujitsu MPE3043AE, Руководство по эксплуатации продукта

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C141-E093-01EN 5 - 64
Note:
For transfer of a sector of data, the host needs to read Status register (X'1F7') in order to
clear INTRQ (interrupt) signal. The Status register should be read within a period from the
DRQ setting by the device to 5
µ
s after the completion of the sector data transfer. Note
that the host does not need to read the Status register for the reading of a single sector or
the last sector in multiple-sector reading. If the timing to read the Status register does not
meet above condition, normal data transfer operation is not guaranteed.
When the host new command even if the device requests the data transfer (setting in DRQ
bit), the correct device operation is not guaranteed.
* Transfers dummy data
* The host should receive 512-byte dummy data or release the DRQ set state by resetting.
Status read
Command
BSY
INTRQ
DRDY
~
Parameter write
DRQ
Data transfer
Figure 5.3 Protocol for command abort
5.4.2 Data transferring commands from host to device
The execution of the following commands involves Data transfer from the host to the drive.
•
FORMAT TRACK
•
WRITE SECTOR(S)
•
WRITE LONG
•
WRITE BUFFER
•
WRITE VERIFY
The execution of these commands includes the transfer one or more sectors of data from the
host to the device. In the WRITE LONG command, 516 bytes are transferred. Following
shows the protocol outline.
a) The host writes any required parameters to the Features, Sector Count, Sector Number,
Cylinder, and Device/Head registers.
b) The host writes a command code in the Command register. The drive sets the BSY bit of
the Status register.