FUJITSU MHZ2250BJ - Manual (Page 266)

Operations
6.1.2 Response to COMRESET
The response to COMRESET is almost the same as the response when power is
turned on and a power-on reset is then cancelled. The device establishes
communication with the SATA interface (PHY Ready) and sends the RegDH FIS
(STS = 50h) to notify the host that the device is ready. Then, the COMRESET
sequence is completed.
Figure 6.3 Response to COMRESET
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