Prog_b low when FX3 powers up | Cypress Semiconductor
Prog_b low when FX3 powers up
i'm new to FX3 world. I have design a board with FX3 connected to Xilinx Kintex 7 325T FBG676. FPGA alone works fine: i'm able to switch on the LED, program flash ecc ecc. using JTAG connector. Now i would like to program FPGA using JTAG and using a GPIO that toggles, switching on and off the LED. The problem is: prog_b remains low when i power up the board while it should remain high due to the pull up resitor.
I've tried to disconnect the resistor that connects fx3 to fpga and from the FPGA side it is at high voltage but from fx3 side is at low voltage.... i just can's understand why!!!!
Can anybody help me ?