Hi guys,

Are there any FTDI FT245R experts (or experienced users!) here?

I've got a USB JTAG adapter on the bench. Basically it's an FTDI FT245R,=20
an Altera CPLD, and a pair of Texas Instruments level translators (it=20
converts down to 1.6V, then up to whatever the target voltage is).

What I'm seeing is normal activity on RXF and RD# -- that is, RXF going=20
low, the CPLD pulling on RD#, a 1tcy delay, 8 data bits coming out of my=20
serial debug port (and appearing on my DSO's screen), followed by RD#=20
going high again. But even with a "checkerboard" (0x55 0xAA) or "all=20
toggle" (0xFF 0x00) test pattern, all I get from the output pins is a=20
solid 0xFF.

Is anyone aware of any 'gotchas' with the FT245R (or its predecessors in=20
the FT245B series) which could cause this?

Thanks,
--=20
Phil.
piclist@philpem.me.uk
http://www.philpem.me.uk/
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.