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USB Superspeed Peripherals

Anonymous
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        Is cyusb3.sys supporting 1 mSec or more of isochronous transfer?   
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1 Solution
Anonymous
Not applicable

Yes. You need to use EP3 or 7 if you are going for ISO, multi packet transfers.

   

Regards,

   

sai krishna.

View solution in original post

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8 Replies
Anonymous
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        Continue! I want to data tarnsfer over 1msec in 1 time Isochronous transfer. However I transferred data just 1msec. regard.   
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Anonymous
Not applicable
        solved! I didn't use EP3. Thanks.   
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Anonymous
Not applicable

Yes. You need to use EP3 or 7 if you are going for ISO, multi packet transfers.

   

Regards,

   

sai krishna.

View solution in original post

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Anonymous
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        Hi sai,I have next problem. I tried to transfer the data of the following capacity inputted from GPIF-FIFO on isochronous. 1024(paket) x 10(burst) x 2(frame burst) x 8(1msec) x 10(10msec) = 1,638,400byte However, windows will hang-up and it will be a blue screen. Please let me know why. regards.   
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Anonymous
Not applicable
        attach blue screen   
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Anonymous
Not applicable

This might be due to your host controller not allowing you to allocate more bandwidth.

   

We can check the maximum bandwidth allocated by the Host to our device for these conditions:
1. Burst length: 15, single ISO packet
2. Burst length: 7, two ISO packets
3. Burst length: 5, three ISO packets.

   

You can also try for the above mentioned configurations.

   

Thanks,

   

sai krishna.

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Anonymous
Not applicable
        Thank you sai, >1.Burst length:15, single ISO packet >2.Burst length:7, two ISO packets >3.Burst length:5, three ISO packets. So, More than the above-mentioned bandwidth is expectable on the present host controller? Thanks   
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Anonymous
Not applicable

Right.

   

If we ask for any bandwidth more than around 130MBps for ISO, host controller fails to do that.

   

Thanks,

   

sai krishna.

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