Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

ULPI-UTMI translator doesn't work when ULPI drives USB domain #280

Open
jeanthom opened this issue Sep 25, 2024 · 0 comments
Open

ULPI-UTMI translator doesn't work when ULPI drives USB domain #280

jeanthom opened this issue Sep 25, 2024 · 0 comments
Labels
bug needs validation described problem or solution requires further validation

Comments

@jeanthom
Copy link

Some time ago reset circuitry was added to the ULPI-UTMI translator for driving the reset pin:

cf6abaa#diff-de77f76028125aedf4c17b29d20a297397b3cf32507f0c202df785f0d76974c7R861-R866

It turns out that this causes a chicken-and-egg problem when the ULPI is clocking the USB domain, as it needs a handful clock cycles for deasserting reset on the ULPI PHY, which won't happen on most ULPI chips when under reset.
@miek miek added bug needs validation described problem or solution requires further validation labels Oct 17, 2024
@miek miek mentioned this issue Dec 10, 2024
Open
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
bug needs validation described problem or solution requires further validation
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@miek @jeanthom