Problem: connect emulator Xilinx, shows the Find wining one devices.
Cause analysis: due to the principle diagram is used in the chip TXBN0304 transfer the TCK, TMS, TDI, TDO it several JTAG pins, the chip TXBN0304 have no ability to drive, so lead to higher voltage is not of TDO, thus linking the emulator,
TXBN0304 chip solution: be removed, the TCK, TMS, TDI, TDO pin directly received from FPGA JTAG emulator tube feet,