Hi,
Taking advantage of a good exchange rate to the USA at present, I bought a coolrunner 2 CPLD evaluation kit from xilinx. I didn't check the IO standards of the supplied device though. I've now found it uses LVTTL amongst other things.
The top end voltages of LVTTL is about mid range on standard bipolar TTL and in the linear area of CMOS. Does anyone have any experience of interfacing these three differing IO standards?
I really want to interface to standard ROM / RAM, a z80 and RS232, is there a cheap easy fix for this ?
Next time I read the datasheet!
cheers, Dave