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 ?