Hi all,
I am Developing a Driver for Isochronous Transfer and I would like to test USB2.0 High speed isochronous data transfer using Win2K + service pack4.
My Driver is working fine with full Speed Isochronous Transfer, but the same Driver is not working with High speed isochronous data transfer.
1).Does it requires any change in my functional Driver,Else
2)Is there any bug in Bus Driver for High speed Isochronous Transfer.
Thanx in Advance,
Gobinath
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Gobinath Krishna wrote:
My Driver is working fine with full Speed Isochronous Transfer, but the
same Driver is not working with High speed isochronous data transfer.
In general, the same driver should work.
Max packet size can change from full-speed to high-speed mode. The
major difference is that in high-speed mode the data can arrive MUCH
faster (up to 3 packets per Micro frame, and 8 Micro frames per
equivalent full-speed frame).
What problems are you seeing? Have you tried your driver with a variety
of high-speed controllers? We’ve seen very significant variation in the
performance of controllers under high isochronous loads.
Are you certain the device is working properly? Do you have a USB bus
trace?
Peter
OSR
Gobinath Krishna wrote:
Hi all,
I am Developing a Driver for Isochronous Transfer and I would like to
test USB2.0 High speed isochronous data transfer using Win2K +
service pack4.
My Driver is working fine with full Speed Isochronous Transfer, but
the same Driver is not working with High speed isochronous data transfer.
1).Does it requires any change in my functional Driver,Else
2)Is there any bug in Bus Driver for High speed Isochronous Transfer.
There have been several issues reported with high-speed isochronous in
Windows 2000. Have you tested your driver on Windows XP? The USB 2.0
support there is better.
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