FUJITSU MHZ2250BJ - Manual (Page 255)

5.4 Command Protocol
4) The device receives the DATA FIS from the host.
5) When all data has been transferred, the device sends the RegDH FIS (with 1
set in the I bit) to complete execution of the command. If the device has an
error, it reports the error. If any data remains to be received by the device,
this protocol is repeated starting from step 3). (The maximum data size is
8 KB.)
Device Host
RegHD
PIO Setup
DATA
RegDH
Figure 5.15 PIO data-out command protocol
C141-E280 5-181