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12 years ago

JTAG- USB byteblaster programming cable

Dear sir,

We plan to connect all the devices in JTAG chain (please find the document attached) in a board.

When programming cyclone-IV FPGA using JTAG interface using USB byteblaster, do we need to connect pull up to TMS, TDI at 2.5V and pin 4 of JTAG header directly to 2.5V(VCCA) of cyclone IV FPGA instead of 3.3V(VCCIO of bank 1 is 3.3V).

Please clarify whether 2.5V or 3.3V to be used at JTAG header(at pin 4 & pull ups on TDI(pin 9), TMS(pin 5) respectively) ?

Best Regards,

Thulasi Ramu J

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