USB 2.0 ISP1761

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originally posted by e-tricky@Oct 25 2006, 11:54 PM

that sounds good!

@hippo: would you share your schematic to connect the isp1761 to the santa cruz header and send it to me? that would save a plenty of time for me.

i have additional questions, maybe you can help me:

i'm new with usb, how did you test the transfer rate of 10mb/s? did you use a loop or an other device? how to communicate from a windows pc to the nios system via usb? is there some sample code?

i would be very happy to get more information about this!

thank you!

e-tricky

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It was based on

http://www.nxp.com/acrobat/applicationnotes/an10037_4.pdf (http://www.nxp.com/acrobat/applicationnotes/an10037_4.pdf)

use 16bits data mode, shared host/device dma and irq

and add a latch from data bus to generate chip address.

pull high data[31:16] with a single R.

a[17] <= 0;

a[16:1] <= data[15:0]

then you have a data port and reg adress port.

You may find other useful doc on their site.

I wrote a simple test program (without Linux) to do the transcations directly to a fast USB thumb disk.

I will try Linux later, and I will share with you.

The USB driver is not trivial. But using Linux is easy, they hide the details.