Error: JTAG ID code specified in JEDEC STAPL Format File does not match any valid JTA

Dear Alex,

The board has worked previously.

All impedences ,power connections on the board are proper.

Yes I am using programming file (.pof) it is intended for device,

currenlty we are using ByteBlaster II for programming hardware.

TDI,TCK ,TMS are getting to the device ,It is driving TDO also

while checking JTAG Chian at Quartus II it is showing uncertain TCK value.

thanks&regards

sarath