Filter
Top Products
C141-E034-02EN 5 - 57
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 50 µs 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 5.4 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.