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Altera_Forum
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14 years ago

cyclone IV configuration: VCCIO8 connection

I’m currently using an EP4CE6F17I8LN on a PCB in an AS configuration mode (EPCS4 PROM) and I’m experiencing some issues with its configuration (device stays in POR with nSTATUS low). In my circuit im...
Altera_Forum's avatar
Altera_Forum
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14 years ago

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I mean nstatus stays low after nConfig goes high...

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Look at the timing diagrams in this document:

http://www.ovro.caltech.edu/~dwh/carma_board/fpga_configuration.pdf

p4. nSTATUS should go high after nCONFIG comes high.

Probe around your board and make sure all the signals are in the correct state.

Do you have the JTAG connection wired up?

Cheers,

Dave