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Altera_Forum's avatar
Altera_Forum
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10 years ago

nstatus get low periodic

it is a new board,VCCINT is 1.14V,VCC is 3.32V .VCCA is 2.48V,VCCD_pll is 1.15V.JTAG can not find the device. when I check the state of FPGA,I find that pin of con_done is low, and pin of nSTATUS...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

You don't say what device you're using - Cyclone IV? Assuming so...

1) VCCINT & VCCD_PLL are a little low - but shouldn't stop it working.

2) Is nCE tied low?

3) Is nCONFIG driven or pulled high?

4) Does EVERY power pin have power?

nSTATUS will only go low if nCONFIG is driven low. Is that what you're doing? Is that intentional?

If points 2-4 above are true JTAG should be able to detect it.

Cheers,

Alex