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Isochronous transfer in cyusb3.sys
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RSKV

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Isochronous transfer in cyusb3.sys

ko1kun posted on 01 Oct 2012 6:12 PM PST
Member
10 Forum Posts
Is cyusb3.sys supporting 1 mSec or more of isochronous transfer?


Re: Isochronous transfer in cyusb3.sys

ko1kun posted on 01 Oct 2012 06:29 PM PST
Member
10 Forum Posts
Continue! I want to data tarnsfer over 1msec in 1 time Isochronous transfer. However I transferred data just 1msec. regard.

Re: Isochronous transfer in cyusb3.sys

ko1kun posted on 02 Oct 2012 10:20 PM PST
Member
10 Forum Posts
solved! I didn't use EP3. Thanks.

Re: Isochronous transfer in cyusb3.sys

RSKV posted on 02 Oct 2012 11:51 PM PST
Cypress Employee
655 Forum Posts

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

Regards,

sai krishna.



Re: Isochronous transfer in cyusb3.sys

ko1kun posted on 02 Oct 2012 07:37 PM PST
Member
10 Forum Posts
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.

Re: Isochronous transfer in cyusb3.sys

ko1kun posted on 02 Oct 2012 07:40 PM PST
Member
10 Forum Posts
attach blue screen

Re: Isochronous transfer in cyusb3.sys

RSKV posted on 03 Oct 2012 12:05 AM PST
Cypress Employee
655 Forum Posts

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.



Re: Isochronous transfer in cyusb3.sys

ko1kun posted on 04 Oct 2012 10:00 PM PST
Member
10 Forum Posts
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

Re: Isochronous transfer in cyusb3.sys

RSKV posted on 04 Oct 2012 11:22 PM PST
Cypress Employee
655 Forum Posts

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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