USB low-full-high speed peripherals Forum Discussions
Hi
I want to know what is there "Tcxmaster" example?
Hi I'm looking at ezusbsys.c of ezusbdrv. I can see that maximumtransfersize. It's 64*1024 Why ezusb driver's maximumtransfersize is 64*1024? if i much more set like 256*1024, is this affect to usb slave fifo's bulk read speed up ?
Show LessHi
I have query about buffers work of slave bulk mode.
If i have set slave fifo 512x4 quad, how are buffers work?
Maybe it seems like that fx2lp have 4buffers.
So Have this any order in write or read to buffer?
Also can i know about buffers switching time in read or write?
Show LessHi
Now i can not find cyusb.sys source code but i have question.
When i have add value to timeout or maximumtransfersize from 64*1024 to 256*1024,
What happen ?
Show LessHi
Is there cyusb.sys driver sourcecode?
Hi
in slave fifo bulk mode, if read is faster than write to fifo buffer when xferdata is start,
How much have timeout ? (that is maybe stall time).
If i dont write under 512 byte, xferdata is stall forever?
Show LessHi
I have probed Hsync and FlagD signal.
In the Picture,
wave of 2 is sensor's Hsync signal.
wave of 1 is Fx2lp's Slvefifo mode FlagD signal.
You can see that there is something wrong in wave of 1.
Why FlagD is working Random?
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cypress68013A+FPGA+PC how to improve read speed form 68013 to PC?
i'm working on a project. we need FPGA to sample data in 30+M bytes/s. and the FPGA send the data to 68013A(cypress USB High-Speed Peripherals). (68013A works in slave FIFO mode,bulk,AUTOIN ,512, 4Xbuffer). then the PC program read the data from the buffer.
BUT,THE HIGNEST READ SPEED IS ONLY 26Mbytes/s between PC and 68013A.
people in Internet say that read speed can be 40+Mbytes/s. and in our test, the FIFO FULL FLAG is often active, which means PC does not read the data in time. we use DeviceIoControl to read fifo and the datesize one time is 512*127.
HERE IS MY QUESTION
Will the driver version affect the read speed? we use the UZ-USB driver and i heard it is the oldest version. Do you know the highest read speed in this driver ?