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JTAG Signal Levels...

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  • 1.  JTAG Signal Levels...

    Posted 06-14-2017 07:10 AM


    I'm using both the BCM53286 SoC and a BCM5482S GPHY in our system and wish to daisychain together the JTAG ports to allow access via one JTAG connector.

    What are the signals levels for the JTAG ports on each of these devices?

    Is the TDO output on either device a +1V2, +2V5 or +3V3 signal?

    Are TDI, TCK, TMS, TRST inputs +3V3 tolerant?




  • 2.  Re: JTAG Signal Levels...
    Best Answer

    Posted 06-16-2017 08:09 AM

    Hi Darren,

    The JTAG pins are 2.5V IO pins and are 3.3V tolerant.




  • 3.  Re: JTAG Signal Levels...

    Posted 06-19-2017 09:11 AM

    Thanks Ryan!