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Altera_Forum
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16 years ago

HELP ME about EP2C20Q240C8,PLEASE!

HI ALL I'm using the cycloneII(EP2C20Q240C8).I want to know what the difference the pin 178 and the others.when i use the pin 178 as LVTTL output,it cannot output a wave (frequency about 25MHz whe...
Altera_Forum's avatar
Altera_Forum
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16 years ago

I'm not aware of a known issue with pin 178 of the said Cyclone II chip, if I understand right, you have reported, that it had worked for you in other designs too. So there are two possible explanations:

- A hidden short on your PCB

- A Quartus or Cyclone II silicone bug

In the latter case, you should contact Altera suport with an example design, that reproduces the problem.