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In my PCB, FX3's IO power rail is set to 1.8V, which is also the power rail for FX3's JTAG interface. But problem occurs when openning segger GDB server, its GUI disappear. I think the voltage may be too low for the dongle to recognize the PCB. Is it true? Thank you.
Solved! Go to Solution.
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Thank you. I solve the problem by disconnect VREF and Vsupply pin at the Jtag interface of the PCB. Now JTAG related io voltage can be 1.8V. Vsupply is constant 3.3V sourced by the J-link.
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This because the Segger JTAG device output 3.3V and I connect the Vsupply pin with Vref pin at PCB. Vref pin is 1.8V. Short circuit occurs between 1.8V and 3.3V.
My circuit design follows that in cypress development board. I think cypress development board will have the same problem. Please confirm. Thank you.
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Hi,
We don't see the problem when all the VIOs are set to 1.8V.
Please see the below figure:
Regards,
Hemanth
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Thank you. I solve the problem by disconnect VREF and Vsupply pin at the Jtag interface of the PCB. Now JTAG related io voltage can be 1.8V. Vsupply is constant 3.3V sourced by the J-link.