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BurstLength in interrupt endpoint
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BurstLength in interrupt endpoint

Nazila posted on 01 Jun 2012 6:48 PM PST
Top Contributor
55 Forum Posts

Hi,

Can I improve the download speed via interrupt endpoint (I am using it to configure FPGA), the same way that is explained in

http://www.cypress.com/?app=forum&id=167&rID=59529 or  http://72.3.161.91/?app=forum&rID=63024 ?

I have four endpoints in total. Two bulk (slave FIFO GPIF) and two interrupt, I would like to improve the download speed of the OUT interrupt edn point, but when I configure the cypress with the img file, windows cannot recognize the device anymore.

Thanks,

Nazila




Re: BurstLength in interrupt endpoint

aasi posted on 02 Jun 2012 04:27 AM PST
Cypress Employee
1073 Forum Posts

What error code are you getting? (is it code 10? Device cannot start?)

One trouble with using Interrupt or isochronous endpoint for that matter is, if the host doesn't have enough bandwidth to guarantee bandwidth for these endpoints then it'll not configure the device.

Regards,

Anand



Re: BurstLength in interrupt endpoint

dbir posted on 03 Jun 2012 09:21 PM PST
Cypress Employee
26 Forum Posts

as per the Spec, The maximum allowable burst size for interrupt endpoints is three. What value are you setting it to?

 



Re: BurstLength in interrupt endpoint

Nazila posted on 04 Jun 2012 10:54 AM PST
Top Contributor
55 Forum Posts

Hi,

I set the burst length to 3 and it is good now. Where can I find this information? Where can I download the spec?

Thanks,

Nazila



Re: BurstLength in interrupt endpoint

dbir posted on 04 Jun 2012 07:37 PM PST
Cypress Employee
26 Forum Posts

You can download the spec from here http://www.usb.org/developers/docs/usb_30_spec_060112.zip

 

 






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