Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Cyclone IV E JTAG issues - VCCA voltage level

Hi all, I have a custom board with Cyclone IV E (EP4CE115-F484). I am trying to access it via JTAG from Quartus, but keep receiving the "Error: Can't access JTAG chain". I check the Quar...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I wish there was a document showing the startup state machine of the FPGA, i.e. how the resets are done and at what voltage level a rail is considered good.

Then showing the states as the device tries to get config data after reading msel etc.

Then at least one can follow some process of debugging the problem.