Forum Discussion
Altera_Forum
Honored Contributor
8 years agoEP2C5T144 and EP2C8T144 are almost pin-compatible, but C8 has one additional VCCINT/GND pin pair. The board must be designed for C8 pin (or patched). Quartus has migration option to make the design assignments work with multiple similar devices. The Quartus *.pin file tells you how to connect each pin.
EPC2 and EPC3 are completely incompatible.