FUJITSU Disk Drives MHJ2181AT - Manual (Page 158)

5.4 Command Protocol
C141-E088-01EN 5-85
f) When the command execution is completed, the device clears both BSY and
DRQ bits and asserts the INTRQ signal. Then, the host reads the Status
register.
g) The host resets the DMA channel.
Figure 5.7 shows the correct DMA data transfer protocol.
Figure 5.7 Normal DMA data transfer
f d
e
e
d
g
d
f
f