JTAG Failed 21261

I am attempting to JTAG in to a 21261 but I receive the 0x8004 8042 error "Unable to halt processor. JTAG connection failed. You may need to exit the debugger and reset the target HW to correct this problem." I have cycled power but I still see the problem.

I have verified that the JTAG HW is set up properly. The SHARC is set to boot from SPI Flash but the SPI is surface mounted and since I have not JTAG-ed in, I have not programmed the SPI flash. I do see that the /RESET line goes high, after which a DAI1 test point pin goes low. So it seems the SHARC reacts to the /RESET line going high. I am not sure why it is "busy" and why I cannot access it via JTAG.

Thanks,

gar

  • 0
    •  Analog Employees 
    on Aug 20, 2009 8:29 AM

    gar wrote:

    I am attempting to JTAG in to a 21261 but I receive the 0x8004 8042 error "Unable to halt processor. JTAG connection failed. You may need to exit the debugger and reset the target HW to correct this problem." I have cycled power but I still see the problem.

    I have verified that the JTAG HW is set up properly. The SHARC is set to boot from SPI Flash but the SPI is surface mounted and since I have not JTAG-ed in, I have not programmed the SPI flash. I do see that the /RESET line goes high, after which a DAI1 test point pin goes low. So it seems the SHARC reacts to the /RESET line going high. I am not sure why it is "busy" and why I cannot access it via JTAG.

    Thanks,

    gar

    Hi,
     
    We note that you have also sent this question to Processor Tools Support. Since this issue would be better dealt with through our private support system we will continue to correspond via PR57984.
  • This problem was solved after closely looking at the CLKIN, Power Supply and Reset lines.

    The issue was due to incorrect power supply connection in hardware.

    Note that connecting via JTAG appeared to be successful when using the VisualDSP++ Configurator tool to run JTAG tests however we could not actually "JTAG in" from within the VisualDSP++ IDE.

  • 0
    •  Analog Employees 
    on Apr 29, 2019 10:44 AM
    This question has been closed by the EZ team and is assumed answered.