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MicroZed Hardware Design Usage of PUDC_B-Pin as output after configuration
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Related

Usage of PUDC_B-Pin as output after configuration

wolfzeh
wolfzeh over 5 years ago

Hi together,

 

I want to make use of the PUDC_B pin of the MicroZed board as output after configuration. Actually the signal takes place on Pin 17 of JX1.

My Microzed Boards (either 7010 or 7020) are in factory status, i.e. not modified. This means the default pull-up does hold for PUDC_B preceeding to configuration.

When wiring output signals (e.g. GPIO) to this pin, no other signaling than VCCIO (i.e. 3.3V) takes place which apparently make this pin unusable.

 

What in my approach could be wrong? Thanks for any input.

 

Kind regards

 

Wolfgang

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  • wolfzeh
    wolfzeh over 5 years ago in reply to wolfzeh +1
    Obviously, I am having 2 different revisions of boards => the suspicious component at the beginning HAD a 0 Ohms as pull-up. So thanks to Bryan for bringin up the hot lead! Replacing the resistor by a…
  • bhfletcher
    0 bhfletcher over 5 years ago

    Is this a Rev G? Please see this post and Errata.

     

    Errata -- MicroZed Rev G PUDC pull-up incorrect

     

    Bryan

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  • wolfzeh
    0 wolfzeh over 5 years ago in reply to bhfletcher

    I was asking the myself the question on population of a correct resistor value, actually I am measuring 1kOhm on an unpowered board (Rev. G) between JX1 Pin 17 and JX1 pin 80.

    Wolfgang

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  • wolfzeh
    0 wolfzeh over 5 years ago in reply to wolfzeh

    Obviously, I am having 2 different revisions of boards
    => the suspicious component at the beginning HAD a 0 Ohms as pull-up.

    So thanks to Bryan for bringin up the hot lead! Replacing the resistor by a 1k5 in my case reseolves the issue!

    Wolfgang

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  • bhfletcher
    0 bhfletcher over 5 years ago in reply to wolfzeh

    Wolfgang,

    Very glad to hear you resolved the problem, and sorry for the trouble! Thanks for reporting back!

    Bryan

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