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Visitor
Visitor
4,411 Views
Registered: ‎04-11-2012

Use JTAG and Xilinx FPGA to apply signal on a DUT card

Hello,

 

I want to test a digital card which has I/O and a JTAG port (some I/Os of the card are not connected to the JTAG chain).

To correctly stress de DUT card, I want to introduce a FPGA in the JTAG chain to provide stimuli to the DUT card's I/Os.

The FPGA pins would then be connected to the DUT I/Os and then JTAG signals could be applied to the card I/Os.

 

It seems quite simple, I'm just wondering if I've to load a design in the FPGA in order to correctly configure its pins (as floating maybe?) or if it will work with any pin state/any design?

 

Thank you for your comments,

 

Regards,

 

J-B

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Scholar
Scholar
4,407 Views
Registered: ‎02-27-2008

J-B,

 

The fpga device powers ON as all tristate (and if the option (pin) is selected, with all weak pullups, or no weak pullups).

 

JTAG is then able to take over any pin, and set it to any state you wish.

 

No design is required.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose
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Visitor
Visitor
4,391 Views
Registered: ‎04-11-2012

Hello Austin.

 

Thank you for quick and clear answer.

What if I use old antifuse FPGA? (I still have ones)

 

Regards,

 

J-B

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Teacher
Teacher
4,375 Views
Registered: ‎09-09-2010

Which vendor did you get the Antifuse FPGAs from?

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"If it don't work in simulation, it won't work on the board."
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