CPS2 build not flashing

[marcusrushy]

<p style=”text-align: right;”>Hi all. I built myself a CPS2 for my MV1C but I cannot seem to flash it. Everything looks fine and it’s not neatest jobs but any ideas. </p>

[marqs]

Assuming you have working programmer and drivers, that kind of issue indicates FPGA doesn’t get power or some of the JTAG pins is not properly soldered.

[marcusrushy]

Yeah my programmer works fine as flashed OSSC fine. I will go over all soldered parts and try again thanks.

[marcusrushy]

I have reseated everything and reflowed the board but still the same error. I originally installed the CPS2 onto my MV1C board to flash it but D1 started to smoke. Could I have fried the FPGA chip?

• This reply was modified 2 months ago by marcusrushy.

[marqs]

You should first check the output voltages of relevant regulators (U7, U12-14). Regarding D1, it could start smoking if it’s installed wrong way or overvoltage / reverse voltage is applied to 5V input. You should remove this protection diode as it has probably been damaged and could cause issues.

[marcusrushy]

I have replaced D1 and made sure it is the correct way round. I will test the regulators thanks.

[marcusrushy]

U7 outputs 3.30v

U12 outputs 1.19v

U13 outputs 2.48v

U14 outputs 1.20v

U15 outputs 1.79v

[marqs]

Those looks correct. I’d test next connectivity of JTAG pins (TCK, TMS, TDI, TDO) via diode tester while power is disconnected (red lead to GND and black lead to those pins on JTAG header – you should get a reading around 0.5-0.7V on each).

[marcusrushy]

Ok. thanks for all your help so far. Will try that next. Hope we can get this working.

[marcusrushy]

I have the multimeter set to continuity like below.

[marcusrushy]

Then with the red lead on point 1 in the picture I put the black pin on points 2-5. Results are below. Something is wrong 🙂

2 TDI – 0v

3 TMS – 0v

4 TDO – 0v

5 TCK – 0.912

[marqs]

Your point 1 is 5V, not GND. Connect the lead on the other side of the diode.

[marcusrushy]

2 – .472

3 – .949

4 – .490

5 – .353

[marqs]

TMS looks unusually high but otherwise I don’t see anything wrong. Is the FPGA from a trusted vendor?

[marcusrushy]

Got it from mouser

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