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Altera_Forum
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21 years ago

EPCS FLASH

Hi Guys ahd Gurus, On my custom board, I have a EPCS4 device for FPGA configuration. I tried to use this as a serial FLASH. Gues what NIOS crashed and after that I have not been able to set thi...
Altera_Forum's avatar
Altera_Forum
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21 years ago

You should be able to look at the CONF_DONE pin on the Altera FPGA to tell you if it's in configuration mode or not. Also, I hope you put pull-up resistors on CONF_DONE, nCONFIG, etc. and didn't tie them to VCC, since those pins are actually open-drain outputs as well as inputs.

What programming method are you using to program the EPCS? Active serial via the Quartus II programmer, or JTAG via the Nios II Flash Programmer? If the latter, did you do all the mk_target_board stuff?