Maximum USB baud rate realistically achievable?

Go To Last Post
4 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I was looking at common USB UART chips such as the FT232BM

http://www.ftdichip.com/Products/ICs/FT232BM.htm

which can (according to the datasheet) do upto 3 Mbps in USB 1.1 mode, or allegedly 12 Mbps in usb 2.0 mode.

What is the highest stable usb -> xmega baud rates that people have achieved? Can the USB chips really do 3 or 12 Mbps? Can the XMEGA service these high rates and do some other task? What sort of rate can I expect to get working?

Also, aside from USB UART, what rates have people achieved using direct UART between two XMEGA's?

Chendy

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Quote:

Can the XMEGA service these high rates and do some other task?

That kind of depends what it's going to be doing with this 12Mbps data stream doesn't it?

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Yes, of course. But I just wanted to get a feel for the range of experiences. My application will be reasonably CPU light, but this about as specific as I can be at this stage; I cant give any figures for calculations per second etc.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I don't see any mention of 12 Mbits/s; that figure is the USB speed (the full speed rate, not high speed which is does not support). The UART can only do 3 Mbits/s.

USB 1.1 also support 12 mbits/s.