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Microzed breakout carrier card VCCIO pin level

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Priya
Junior(0)
Microzed breakout carrier card VCCIO pin level

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
 

JFoster
Moderator(68)
Hello Priya,

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 

Priya
Junior(0)
Hi Josh,

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-... ,  these pins should give out a volatge equal to VCCIO as selected by the VCCIO jumper.

Priya
Junior(0)
This schematic also describes

This schematic also describes that it be measured accross the above mentioned pins
http://zedboard.org/sites/default/files/documentations/MBCC-BKO_RevA_Sch...

JFoster
Moderator(68)
Hello Priya,

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

Priya
Junior(0)
I just measured it across C4

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

JFoster
Moderator(68)
Hello Priya,

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

Priya
Junior(0)
Thank You Josh. I will get a

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