Hello
I recently designed a basic serial in parallel out IO board that used an Altera MAX 7128slc84-10 chip. I was able to reliably get it to run as expected and everything was fine. I found that I could purchase the
7128slc84-15 chip for about half the price so I did, and now my same setup doesnt work. I recompiled the VHDL for the 15 speed grade chip without any problems and yet it does not run my program correctly. I have loaded a small test program on the 15 chip and it works fine and does what it should. My code is using an external clock to run the state machine so I dont understand why it makes any difference whether I use a -10 or a -15..What should I look for to make this 15 grade chip run my code without problems?? Does a jump in speed make that big of a difference?