5Mbaud serial to USB converter?

Den tirsdag den 21. januar 2014 17.45.09 UTC+1 skrev Syd Rumpo:

can't be sure without trying but I think from this:

that you can get 12MHz/2.375 ~= 5.052Mbaud so about 1% off

-Lasse

Using a microcontroller with CDC usb to serial it is a piece of cake.

--
Failure does not prove something is impossible, failure simply 
indicates you are not using the right tools... 
nico@nctdevpuntnl (punt=.) 
--------------------------------------------------------------

Thanks, Lasse. I read that but found it rather confusing, so a second opinion is very useful.

Cheers

--
Syd

Yes, If I have to start baking my own...

Cheers

--
Syd

Fastest I've seen is Keyspan USA-28XG. It was intended for differential send/receive (not just RS-232) and supported very high transfer speeds (1 Mbit). I doubt the highest speed was for asynchronous, more likely self-clocked serial. Alas, it's a no-longer-supported product.

5Mbaud serial? Sounds like you need to custom-design. Maybe to Ethernet instead of USB? USB is software-moderated with the PC as a master, if you care about dropping packets there's buffering problems ahead!

Fortunately, the PC side is Somebody Else's Problem, but I have done this with 12Mbaud async into an FTDI part.

[Slightly tricky as the only available clock for the async side was 16MHz, so a CPLD generated 12Mbaud using both clock edges and differing numbers of 1/32MHz periods to make the bits.]

Cheers

--
Syd