Figure 5.5 Write Sector(S) Command Protocol - Fujitsu MHW2040AC Product Manual

5.4 Command Protocol
40 ms

Figure 5.5 WRITE SECTOR(S) command protocol

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 starting of the sector data transfer. Note that the host does
not need to read the Status register for the first and the last sector to
be transferred. If the timing to read the Status register does not meet
above condition, normal data transfer operation is not assured
guaranteed.
When the host issues the command even if the drive requests the
data transfer (DRQ bit is set), or when the host executes resetting,
the device correct operation is not guaranteed.
C141-E258 5-133