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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...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Hi,

nConfig problem is solved. The E-PAD was not properly connected to GND :). However JTAG is still not working (JTAG Chain Broken). The snap shot of different signals is attached:

A0: TCK

A1: TDO

A2: TMS

A3: TDI

A4: nSTATUS

A5: nCONFIG

There is no activity on TDO which stays high all the time. Any ideas why is that ?

Thanks