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Altera_Forum
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13 years ago

Do MaxII devices verify flash contents before configuring at power on?

In FMEA analysis of a board using a MaxII CPLD the question came up, do the MaxII devices perform some kind of CRC or checksum check on the configuration flash (CFM) contents before configuration? In...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

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For me, the MAX was not in HZ state with weak pull-up (as it is during configuration by Blaster), because some of its IOs driving LED or ON/OFF of board power supplies were in relevant state. But the configuration of the FPGA by the MAX PFL was failing, even after OFF/ON of the board.

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If MAX II wasn't defective (worked again after reprogramming), the observation indicates that there's no effective configuration consistency check implemented. The configuration bitstream CRC check would prevent a Cyclone FPGA from entering user mode (within the reliability of the respective CRC length).