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Message
From: horizon_temp@y...
Date: Mon, 17 Nov 2003 08:17:49 +0100
Subject: [usb] USB Test Bench getting hung...
I am trying to integrate the following USB files as part of my SoC.
I need to make use of a Low-Speed USB 1.1 device that is just used for
the purpose of downloading some software from the Host Computer onto
a device.
I was trying to use the test bench that was included with the IP
Package developed by Mr Rudolf. I was able to compile the project in
ModelSim.
But on simulating the test bench, it gave some $DISPLAY errors. So
changes were made to the orignal test bench to overcome errors like
Length Mismatch and ACK . Finally the testbench was getting hung in
UTMI_recv_pack task waiting for a ACK from the device. The
message "Getting Descriptor...." is displayed.
After hours and hours of tracing throught the "entire code" and figuring
out how the data was being passed from the testbench onto the core
and the endpoints, - it appeared that there was some error in the
Function Address field. Several permuations and combinations were
tried! Finally the Address was changed to point at "0". But it does not
seem right!
The files have been posted at - www.pitt.edu/~ksg3/usb.tar.gz
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