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EHCI Host Controller Design Implementation Problem
by lylfate on Jul 11, 2019
Posts: 1
Joined: May 28, 2016
Last seen: Mar 11, 2022

I am currently developing a host controller based on the EHCI protocol. I have encountered an issue with the EHCI protocol. I don't know how to implement it. The specific description of this problem is as follows:

As mentioned in section 4.5 of the EHCI 1.0 spec, sof token value is delayed frindex a microframe.
Therefore, the software configuration frindex is 0. After the reset is finished, the sof token packet is sent. It will issue nine sof token packets with a sof value of 0. I don't know how to implement this detail in the EHCI protocol. Troublesome people who have designed or are willing to understand help me.
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