08-06-2019 04:44 AM
This is a Artix-7 based custom board where when we power on the board the JTAG led gets green & further the hardware target gets detected but no device is found. Vivado 2016.1 is used here.
1. All FPGA configuration related voltages.
2. JTAG (TCK,TMS,TDI,TDO) signals voltage levels & behaviour
Kindly suggest further debugging steps.
08-07-2019 06:07 AM
out with the scope,
follow the JTAG lines, see where the waveform stops,
you should be able to see the training waveform of JTAG through the loop, and you should see a nice clean signal on al llines.
this is form the old tools, but still relevant
and these guys know a good thing or three
08-08-2019 09:08 PM
On debugging with IMPACT Boundary Scan Chain Debug,
We noticed that the TDO pin is not responding as per the TDI input. TDO is constantly high.
Also in this hardware, VCC_INT voltage was not reaching FPGA and we switched on the board. As a result of which power sequencing was violated. So we want to know that is this the reason for the TDO not responding & the FPGA device not getting detected. Do we need to replace the FPGA?
08-09-2019 12:42 PM
08-09-2019 11:34 PM
TDO line was not connected properly. So looks like that's not the issue.
But its true that the VCC_INT voltage was not supplied initially. So the power sequencing was violated.
Please suggest how to proceed.
Thanks in advance
08-10-2019 06:14 AM