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Visitor
Visitor
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Registered: ‎08-06-2018

Pull up resistor value for Configuration Banks Voltage Select pin on Artix-7 (XQ7A50T-1CS325M)

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Hello,

I am using an Artix-7 device with part number: XQ7A50T-1CS325M. I am using to configuration modes on this device, those are Master SPI x4 (M[2:0] = "010") and JTAG (M[2:0] = "101"). 

VCCO on configuration bank has a value of 3.3V. I am using the same input voltage to power banks 14 and 15.

According to Table 2-6 of UG470, I should connect CFGBVS pin to VCCO_0, which is 3.3V in my case.

Now, I have seen some COTS designs in which they add a 4.7 kΩ pull-up resistor when making the connection between CFGBVS and VCCO_0.

I would like to know if the 4.7 kΩ pull-up resistor on CFGBVS is necessary and why?

 

 

 

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Xilinx Employee
Xilinx Employee
127 Views
Registered: ‎01-21-2013

Re: Pull up resistor value for Configuration Banks Voltage Select pin on Artix-7 (XQ7A50T-1CS325M)

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Hi @guriberomero,

 

We would always recommend following what is in Xilinx official documentation.

Ref: 

https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf

Also check our 7 Series Schematic Review Recommendations (XMP277) linked from https://www.xilinx.com/support/documentation/user_guides/ug483_7Series_PCB.pdf

We also have the following AR specifically for your query: https://www.xilinx.com/support/answers/53134.html

 

I hope this helps with your query.

 

Thanks,
Wendy
Xilinx Technical Support
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Xilinx Employee
Xilinx Employee
128 Views
Registered: ‎01-21-2013

Re: Pull up resistor value for Configuration Banks Voltage Select pin on Artix-7 (XQ7A50T-1CS325M)

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Hi @guriberomero,

 

We would always recommend following what is in Xilinx official documentation.

Ref: 

https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf

Also check our 7 Series Schematic Review Recommendations (XMP277) linked from https://www.xilinx.com/support/documentation/user_guides/ug483_7Series_PCB.pdf

We also have the following AR specifically for your query: https://www.xilinx.com/support/answers/53134.html

 

I hope this helps with your query.

 

Thanks,
Wendy
Xilinx Technical Support
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Visitor
Visitor
102 Views
Registered: ‎08-06-2018

Re: Pull up resistor value for Configuration Banks Voltage Select pin on Artix-7 (XQ7A50T-1CS325M)

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Hello Wendy,

I think answer from AR# 53134 is enough rationale for me regarding this for now.

Thanks for your support.

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