> Hmm?  I don't recall such constraints in any USB specs,
> but I might well have missed them.

I keep forgetting about interrupt endpoints. FS interrupt endpoints can
have any MPS up to 64, FS isochronous endpoints up to 1023. FS control
and bulk are limited to 8/16/32/64. Does that sound right?

> I had a similar problem to address... testing a patch 
> recently submitted against the Linux ehci-hcd for better high 
> speed ISO support!  There's a shortage of software to test 
> such things.

I'll take a look at hacking gadget zero to have an alternate ISO
interface.



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