I used jtag mode to debug Stratix II FPGA for days, and yesterday I pluged off the jtag header with power off and later pluged in again(still with power on). Quartus reported error"cannot detect scan chain".
Active Serial programming mode is still ok, and there are no short-circuits among the Gnd and powers. I test the TDI, it is pulled up to 3.3v in the board and should be high duiring FPGA working. However TDI stays low.
Is my FPGA ok? I am really puzzled with this problems. Need your help badly.
Thanks
Cindy
Active Serial programming mode is still ok, and there are no short-circuits among the Gnd and powers. I test the TDI, it is pulled up to 3.3v in the board and should be high duiring FPGA working. However TDI stays low.
Is my FPGA ok? I am really puzzled with this problems. Need your help badly.
Thanks
Cindy