EZUSB FX2LP transfer speed

Christian,

When you request/transfer data you should request large sizes ~30Kbytes, and the host will break the request/transfer into wMaxPacketSize chunks (use 512 bytes). Quad buffering the endpoint is usually faster. You should be able to get around 30Mbytes/sec. I assume your IFCLK is running at 48MHz, if not make it 48MHz. Usually the bottleck is the USB requests on the host computer, not the FX2.

Lloyd

snipped-for-privacy@cgrobi.de wrote:

Please don't top-post. See the following links:

However, I was under the impression that if the FX2 is not ready with buffers when the host returns the host will not try again until the next phase. Which, in my case results in a 5MB/sec transfers in USB2.0. Is that correct?

A great deal of the noise in this newsgroup is made up of etiquette reminders like this. Perhaps you ought to mail them personally or give up your quest. I for one rarely open your posts anymore because they are quite often gnat-like etiquette remonders. When you do offer relevant responses they are very well informed and useful and based on expertise.

I admit to not knowing fully how the host works with requests, but when you request 30K it seems to wait until the FX2 fills the buffer or timeout occurs, whichever comes first. Not totally sure on this however, I think that is the case.

Yes. I think you are correct there.