Honored Contributor
Honored Contributorthank you, it's a very interesting project
finally i have understood the reason why my usb-jtag-cable is not working with my flex10K board: the problem is related to the jtag chain in where the jtag connector has been wired as "the last device in the chain", and this is terribly wrong !!! The byteblaster is the first device in the chain and his-244-chip is propagating signals through the jtag wires to the fpga chip, to the eeprom configuration chip (it's an optional, not soldered on my devboard but you can add it), and finally to the jtag connector on where you could plug a cable to connect other jtag device on the jtag chain. It has no sense for me! A jtag connector to add external device ? what is the meaning of that ? No sense, but it makes terribly wrong the wiring i did putting the jtag connector of my usb-jtag-cable on it because TDO and TDI can't be propagated in right way. I really think the final solution is: i have to make a new dev-board putting a PLCC84 socket on a 1000-holes-pcb, putting a flex10k inside it, adding a 50Mhz 4-pin oscillator clock on the clk43 pin of the fpga, and wire the fpga jtag (TDI, TDO, TMS, TCK) signals the the usb-jtag-connector, then installing Quartus-II V8 and have fun with it.
