Reading ADSP-21261 Processor with minimal components

Hi

Is it possible to read a SHARC processor ID WITHOUT the SPI flash installed, via the ICE tool ? I developed a custom board and doing basic tests like power and processor communication,  the only components populated are X2 4.7k pull-up resistors (FOR THE JTAG LINE ), is it possible to read the processor with minimal amount of components ?

The processor is a ADSP-21261. (also the 25.00MHZ oscillator crystal is NOT connected), So far I cannot communicate with the processor at all.

I need this to verify that the power supply and processor is working.

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  • 0
    •  Analog Employees 
    on Sep 30, 2015 8:03 AM over 4 years ago

    Hi,

    Yes, even without a SPI Flash device you should be able to connect to the processor via JTAG . But for this to work , you have to make sure that the power, JTAG circuitry is correct (refer to the ADSP-21261 EzKit Schematic) and a proper Clock input source. Also the processor input pins should not be left floating(CLKCFGx, BOOTCFGx, CLKIN etc )Generally the datasheet pin description will have this information. Once you get these basic things right, you should be able to connect the processor through JTAG with the help of ICE

    Regards,

    Mahesh

Reply
  • 0
    •  Analog Employees 
    on Sep 30, 2015 8:03 AM over 4 years ago

    Hi,

    Yes, even without a SPI Flash device you should be able to connect to the processor via JTAG . But for this to work , you have to make sure that the power, JTAG circuitry is correct (refer to the ADSP-21261 EzKit Schematic) and a proper Clock input source. Also the processor input pins should not be left floating(CLKCFGx, BOOTCFGx, CLKIN etc )Generally the datasheet pin description will have this information. Once you get these basic things right, you should be able to connect the processor through JTAG with the help of ICE

    Regards,

    Mahesh

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