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Altera_Forum
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10 years ago

Cyclone IV configuration - nCONFIG signal and JTAG programming issue

Hi, I have a custom board for EP4CE22E22 Cyclone IV FPGA. I have configured the board for JTAG only mode and using USB Blaster Rev.B for programming. The problem I am facing is that JTAG Scan f...
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Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Well done on fixing nCONFIG. You still need to check all the power and ground pins are connected up. Beyond that the bare minimum you need to allow JTAG to work is:

nCE low.

nCONFIG pulled up.

nSTATUS pulled up.

MSEL pins connected to GND or VCCA (2.5V).

DCLK & DATA0 at valid levels.

Cheers,

Alex