Typically, Hard reset was issued before sink send request without obvious current sink with below reason:
- Sink have not get VBUS was powered 5V and vRd is effective. The max timeout is 275ms (refer tVBUSON in Type-C specification.). Sink will send Hard Reset.
- In SPR Mode when a Sink observes an absence of Source_Capabilities Messages, after VBUS is present, for a duration of tTypeCSinkWaitCap (max: 620ms) the Sink Shall issue Hard Reset Signaling in order to restart the sending of Source_Capabilities Messages by the Source. Sink will send Hard Reset.
- If Source have sent Source Capabilities than 50 times, but sink have not acked with GOODCRC. Source will send Hard Reset.