AM5746: DAP Error Debugging Custom Board with BlackHawk USB560v2 System Trace Emulator

KTM

Part Number: AM5746

We built a custom board based on the idkAM574x development board, although we changed the external emulator connector to the 20-pin version. We can successfully debug using the on-board emulator but get the following error when using the BlackHawk USB560v2 System Trace Emulator:

< snip >
IcePick_D: GEL Output: IVAHD ICONT2 is released from Wait-In-Reset.
CS_DAP_DEBUGSS: GEL Output: --->>> CONFIGURE DEBUG DPLL settings to 1.9 GHz <<<---
CS_DAP_DEBUGSS: GEL: Error while executing OnTargetConnect(): target failed to read 0x80031804@APB_View
     at (*((unsigned int *) 0x80031804@data)&0x2) [AM574x_dap_startup.gel:244]
   at dpll_dbgss_config_board() [AM574x_dap_startup.gel:185]
   at OnTargetConnect()
CS_DAP_PC: Error connecting to the target (Error -1170 @ 0x0) Unable to access the DAP. Reset the device, and retry
the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings
(e.g. lower TCLK). Emulation package 9.1.0.00001)

We tried the troubleshooting suggestions but nothing seemed to help. The JTAG TCLK frequency is down to 10.7 MHz but we still get the same error. Running "Test Connection" from the Target Configuration window shows no errors.

I'm guessing the problem is in our migration to the 20-pin JTAG connector. Do you have an example AM574x 20-pin JTAG interface we can study? Any other troubleshooting ideas?

Thanks,

KTM

over 5 years ago

0 KTM over 5 years ago

Intellectual 850 points

Hi,

Did this post get lost during the E2E upgrade? I still would appreciate some help resolving the debugging issue we are seeing. Reference schematics and suggestions are appreciated.

Thanks,

KTM

0 Karan Saxena over 5 years ago in reply to KTM

TI__Guru* 78145 points

Hi KTM,

Did you look at the troubleshooting guide here - https://www.blackhawk-dsp.com/downloads/docs/appnotes/BH-Troubleshooting-UG-03.pdf

There is a section on JTAG Connector Signals and Pin-Outs.

Regards,

Karan

0 KTM over 5 years ago in reply to Karan Saxena

Intellectual 850 points

Hi Karan,

The troubleshooting guide wasn't any help. It doesn't mention the issue I'm having. The pin-out is generic and lacks the details I need to ensure we have the proper connections and pull-ups in place.

Do you have anything specific to the AM57x family or a related family? What does the error we are seeing indicate? How do I troubleshoot this issue?

Thanks,

Kevin

0 KTM over 5 years ago in reply to KTM

Intellectual 850 points

I finally located a useful example. See the schematic for the TMDSEVM572X board. It uses the TI variant of a 20-pin JTAG connector but provided us a good example. We noticed the board designer had not routed signal RTCK to the device. Instead, that signal was looped at the connector with TCK, as is sometimes done with AM437x devices. Unfortunately, we need to respin the board to fix this and other problems, so I'm not certain this modification will solve our problem.

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AM5746: DAP Error Debugging Custom Board with BlackHawk USB560v2 System Trace Emulator