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Erik Zwartbol

JTAG-HS3 Vref source other than VCCO_0

Question

Hello All!

I am currently working on designing a carrier card for a board that uses a Zynq Ultrascale+ mpSoC (XCZU2CG) and we want to use the JTAG-HS3 to program the SoC via the carrier card. 

The HS3 datasheet states "To function correctly, the HS3’s Vref pin must be tied to the same voltage supply (VCCO_0) that drives the JTAG port on the FPGA." This 1V8 supply however is not available on our carrier board (it doesnt leave the SoC board).

We do have access to a 3V3 supply from the SoC board. Can the JTAG-HS3 function if we connect the Vref supply pin to a 1V8 LDO Regulator powered from the 3V3 of the SoC board?

 

Any help on this is much appreciated.

Edited by Erik Zwartbol

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2 answers to this question

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Hi @Erik Zwartbol,

I reached out to one of our design engineers about this thread. They responded that they think it should be ok to place a 1.8V LDO on the carrier and use it to power VREF.

cheers,

Jon

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