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MicroZed Hardware Design Microzed breakout carrier card VCCIO pin level
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Microzed breakout carrier card VCCIO pin level

100priya
100priya over 7 years ago

Hi,

 

There is a doubt I have ever since I started working on the microzed and breakout carrier card.

 

There is a VCCIO jumper on the carrier card which provides 3 options: 1.8V, 2.5V and 3.3V.  The following pins on carrier card are supposed to give out a voltage level (DC signal) as selected by the VCCIO jumper:

 

CON1: 53,54

CON2: 49,50

 

In order to check that the carrier card along with the VCCIO jumper are working fine, we should check the level of the above mentioned pins.

 

Well in my case, the above mentioned pins have a voltage level of 0.6V when I set the jumper to 1.8V position. These pins maintain the same voltage level even when I switch the jumper to 2.5V or 3.3V. Could anyone please suggest what might be the issue here? I feel that the carrier card has some problem. Should I get a new carrier card?

I am facing serious issues as all the output signals from CON1 and CON2 pins which are controlled by the VCCIO jumper are attenuated to below 0.5V.  Please suggest if I should buy a new card.

 

Thank you

Regards,

Priya Joshi

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  • jafoste4
    0 jafoste4 over 7 years ago

    Hello Priya,

    Your board is operating as expected. I take it you were measuring VCCIO across the jumper when you were reading the 0.6V?

    If so that was your issue. Please refer to the schematic to where you can measure VCCIO at. In my case I measured it across C4 on my BKO and was successful in seeing all VCCIO values as I toggled the jumper (1.8V,2.5V,3.3V)

    --Josh 

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  • 100priya
    0 100priya over 7 years ago

    Hi Josh,

    I did not measure VCCIO accross the jumper. I simply measured the output voltage of the following pins on BKO:

    CON1: 53,54

    CON2: 49,50

     

    According to the doc  - http://zedboard.org/sites/default/files/documentations/5271-UG-MBCC-BKO-V1.2.pdf ,  these pins should give out a volatge equal to VCCIO as selected by the VCCIO jumper.

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  • 100priya
    0 100priya over 7 years ago

    This schematic also describes that it be measured accross the above mentioned pins

    http://zedboard.org/sites/default/files/documentations/MBCC-BKO_RevA_Schematic_131114.pdf

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  • jafoste4
    0 jafoste4 over 7 years ago

    Hello Priya,

    I will confirm this tomorrow, I see what you are refering to in the schematic.

    In the mean time please measure VCCIO via the C4 Capacitor on the BKO and see if you are seeing the sellected VCCIO value.

    --Josh

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  • 100priya
    0 100priya over 7 years ago

    I just measured it across C4 as well. It is 0.6V only. 

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  • jafoste4
    0 jafoste4 over 7 years ago

    Hello Priya,

    I can confirm I am seeing VCCIO on the pins your stated above. It does appear your board is having an issue. 

    My first suggestion would be to first replace the BKO as it is responsible for generating VCCIO.

    --Josh

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  • 100priya
    0 100priya over 7 years ago

    Thank You Josh. I will get a new BKO then.

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