Greetings,
We are working on our custom PCB with MAX10. Unfortunately, we are still unable to connect to this target from Quartus via USB-Blaster+JTAG (Auto-connect gives "Error: Unable to scan device chain. Can't scan JTAG chain").
We're using TerasIC USB-Blaster and we've checked that it's working just fine.
Here is a brief description of current debugging setup:
- FPGA Model
- 10M50SCE144C8G;
- Power Supply
- External (from 10M08 devkit) - 3.3 [V] to VCC_ONE (core) and all banks;
- Oscillator
- internal only;
- JTAG Configuration:
- TCK - tied to GND;
- TDI, TMS, JTAGEN - tied with 10k to VCCIOB;
- TDO - not connected;
- FPGA Configuration:
- DEV_CLRn, DEV_OE, nCONFIG, nSTATUS, CONF_DONE - through 10k to VCCIO;
- CONFIG_SEL, CRC_ERROR - not connected;
- PCB - Layers - 4;
- Soldering - Hot-air;
- Shortcut tested;
Considerations: After a couple of tests, we figured out that connecting TCK signal to FPGA pulls down rest of pulled up signals (TMS, TDI) - which is different from MAX10 devkit signals behaviour. Also CONF_DONE signal remains low (which indicates that FPGA is still in reset state).
Any ideas what to do/check next ?
