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Hi Angad
Firstly in future please start a new thread regarding your topic if it doesn't already exist to avoid hijacking an existing thread that is off-topic.
A1: COMINIT idle (quiet) time is 480UI (unit intervals) or 310.4 to 329.6ns and COMWAKE idle time is 160UI or 103.47 to 109.87ns, therefore the signal detect can be used to detect these periods as per the OOB protocol sequence in the SATA specifications.
A2. Speed negotiation is performed during the OOB protocol sequence in which the device is in control of i.e. it starts at the highest generation signalling speed and works down until the host locks and detects the ALIGN primitive and signals ALIGN back. Once the speed is negotiated it remains until the OOB protocol is performed again with the exception of the optional power management.
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Correct me if I am wrong. Suppose the Host always start(power-on) with lowest speed(Gen1), then host cannot be changed to Gen2?
Honored Contributor
