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Altera_Forum
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14 years ago

CycloneIII and CycloneIV pin to pin compatible?

Hello everybody, i have a simple question, i want to use EP3C25 - 144 pin EQFP package in my project and there is also EP4C22 - 144 pin EQFP package fpga. are these pin to pin compati...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hello everybody,

for a last check, i have made a pin to pin comparison according to the documents provided on altera website.

Document is attached.

for EP3C25 and EP4E22 EQFP package, result is;

there are 3 differences on pin numbers: 4-22-79

EPC3 EPC4

4- IO GND

22- CLK0 GND

79- IO GND

so, if we connect all of these three pins to GND, there will be no compatibility problems between these two fpga.

Regards..