ilikebbs
Advanced Member level 4
I can not initialize jtag chain. I use xc2c128 from Xilinx.
I have two boards. One is OK, the other has problems.
I measure each jtag pin resistance to ground of two board. And i find that resistance of TMS pin to ground is only 250 ohm in the abnormal board.
The resistance of TMS pin to ground is 10k ohm in the normal board.
All jtag pins have been pulled up with 10k ohm resistor.
So can I get the conclusion that the TMS pins has been destroyed?
Do you meet the similar situation before?
Thanks.
I do not have the usb download cable. My parallel download cable can be used to downlad jed file in other board. It is ok.
I have two boards. One is OK, the other has problems.
I measure each jtag pin resistance to ground of two board. And i find that resistance of TMS pin to ground is only 250 ohm in the abnormal board.
The resistance of TMS pin to ground is 10k ohm in the normal board.
All jtag pins have been pulled up with 10k ohm resistor.
So can I get the conclusion that the TMS pins has been destroyed?
Do you meet the similar situation before?
Thanks.
I do not have the usb download cable. My parallel download cable can be used to downlad jed file in other board. It is ok.