Forum Discussion

SYiwe's avatar
SYiwe
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Cannot access the JTAG port of Arria10 SoC

There’re two Arria 10 SoCs in my design, the follwoing picture indicates the JTAG chain on board. Chip A and Chip B share the same TCK & TMS. TCK is pulled down to GND and TMS is pulled up to VCCP...
JohnT_Altera's avatar
JohnT_Altera
Icon for Regular Contributor rankRegular Contributor
6 years ago
This can happen if there is a corrupted bitstream. 1st method to resolved the issue is by changing the MSEL to not AS mode and power the board before switching the board back to AS mode. Then you can use JIC file to reconfigure it or erase the flash content. 2nd method is have a direct connection from the blaster to the flash through Active Serial interace. Then erase or re-program it.
SYiwe's avatar
SYiwe
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Hi, here's some facts that I can confirm:

1. The voltage values of VCCPGM, VCCIO_HPS, VCCIOREF_HPS, A10VCCPLL_HPS and A10VCCA_PLL are correct, range from 1.824V to 1.829V.

2. I design the JTAG circuit following the instructions in the handbook named "Configuration, Design Security, and Remote System Upgrades in Arria 10 Devices", as you can see in the following picture. All the resistors are soldered well.

3. The impedance values between JTAG pins(TDI, TDO, TCK and TMS) and GND range from 1.028KΩ to 1.180MΩ, and the impedance values between JTAG pins and VCCPGM range from 1KΩ to 1.180MΩ.

4. After power-up, TDI and TMS are high, TCK is low and the voltage of TDO is 0.612V. MSEL=000 and both nCONFIG and nSTATUS are high.

5. When I run "Auto detect" in Programmer, a error message occurs: "unable to scan device chain. Can't scan JTAG chain. Do you want to open the JTAG Chain Debugger to troubleshoot the JTAG chain?", as you can see in the following picture.

6. When I run "Test JTAG Chain", the Programmer reminds that TDI might be shorted to GND,and unknown devices detected, as you can see in the following picture.

7. When I run "Auto detect" in Programmer, the oscilloscope can capture waveforms of TDI, TCK, TDO and TMS, as you can see in the following pictures.

And here's my questions:

1. Is the JTAG port of Arria 10 permanently damaged? How can I confirm that?

2. Currently I'm using Altera Usb Blaster, does usb blaster support Arria 10 SoC? Should I change to Altera Usb blaster II?

3. Do you have more suggestions for me to access the JTAG chain?

Thanks, regards.