USB High-Speed uFrame Limitations
USB High-Speed uFrame Limitations
- Subject: USB High-Speed uFrame Limitations
- From: Mark Moore <email@hidden>
- Date: Thu, 08 Nov 2012 12:22:04 +0100
Can anyone confirm if the documented limit of one 1024 byte transaction per USB2 high-speed uframe still exists in the current 10.8 AppleUSBAudio driver?
From what I can tell from older versions of the source code there are some assumptions made that there can only be one transfer per uFrame. However, these look like historical carry-overs from the original full-speed design rather than a fundamental issue with the driver. Comments on the USB lists and inspection of the source code suggests that there is no corresponding limit in the USB UIM.
Also, can anyone comment on the availability of the AppleUSBAudio.kext source code? It seems to be missing from all the archives and developer downloads at Apple at the moment.
Thanks,
-- Mark
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