Why does the ICE Test pass but IDDE cannot connect to target?

The ICE Test Utility passes, but when I try to connect to my target in the IDDE the connection fails with a target connection error. What is causing this?

  • 0
    •  Analog Employees 
    on Feb 5, 2009 11:34 AM

    CraigG wrote:

    The ICE Test Utility passes, but when I try to connect to my target in the IDDE the connection fails with a target connection error. What is causing this?

    The ICE Test utility only talks to the JTAG port on the processor. It sets the processor to bypass mode and shifts bits through the JTAG bypass register. This utility only verifies that the JTAG connection is working, nothing more. These tests do NOT test the /EMU signal, which is specific to ADI and used by our ICEs as a JTAG emulation status flag from the processor.  They also do NOT test for issues like shorts, problems with the processor's pins, etc.

    You should also check the state of the bus request signal on power-up and verify that the processor is not stuck in reset.

    If you are using a custom board, it is also recommended to consult EE-68 for details of the JTAG specification to ensure your board conforms with this standard. This EE-Note is available on our website at:

    http://analog.com/ee-notes

  • 0
    •  Analog Employees 
    on Apr 29, 2019 10:47 AM
    This question has been closed by the EZ team and is assumed answered.