Figure 5.15 Pio Data-Out Command Protocol - Fujitsu MJA2500BH - Mobile 500 GB Hard Drive Product/Maintenance Manual

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.)

Figure 5.15 PIO data-out command protocol

C141-E293
RegHD
PIO Setup
Host
DATA
RegDH
5.4 Command Protocol
Device
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