IRQ before the next SOF

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by DavideG on Tue Sep 17 00:11:19 MST 2013
Hello to all,

here a strictly technical question for ohci expert:

is possible to request a WritebackDoneHead interrupt before the next SOF ?

Working on the InterruptDelay, the minimum settable number of SOFs after the completion of the transfer is (implicitly) one.

But, if the transfer occurs at the init of the frame, then it will wait until the end of the frame for processing the done queue.
This seems to be a lot of time (about 1ms).