JTAG Breaks using FMC DAC

I've got an FMC LPC based DAC card (AD9739A) which appears to break JTAG connectivity when it is connected. I cannot write to FPGA via Xilinx SDK nor does the iMPACT chain initialise work. Is this a known issue/are there work arounds/have i done something stupid?

0 Former Member over 13 years ago

See the following website:

http://wiki.analog.com/resources/fpga/xilinx/fmc/ad9739a#design_files

"Rev A and Rev B of this board mistakenly do not follow Rule 5.62 on the ANSI/VITA 57.1 spec - u201CThe FMC module shall connect TDI to TDO, if the module does not use the JTAG interface.u201D This may cause some FMC platforms (like the VC707 and KC705) to loose JTAG communication when this card is plugged in. It's normally a simple matter to short D30 and D31 on the development system (sorry, this will be fixed shortly)"
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Former Member over 12 years ago in reply to Former Member

Hi, I am plugging in a Xilinx FMC debug card on a REV-C zedboard and I have a similar problem. I am unable to program the bit file through SDK. Has this problem already been fixed in REV C? Is there something else I can look at to figure out the problem? As long as I don't have the FMC debug card connected the zedboard operates normally. Any insight on this will b eappreciated.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 Former Member over 12 years ago in reply to Former Member

Please ignore the post it is resolved, the tdi and tdo were open on the card and they had to be shorted.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel