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Visitor
jeebu
Posts: 6
Registered: ‎09-15-2010
0

Boundary scan is not identifying all the devices

Hi,

i need some help regarding boundary scan using a Xilinx JTAG cable.The problem is that the JTAG which used to identify 4 deviecs on the board(2 FPGA's and 2 PROMs) is now identifying only 1 FPGA and a PROM.Is there any means by which this issue can be solved.

When performing Chain Integrity Test, an error occurs.

ERROR:Portability:90 - Command line error: Switch "-p" is not allowed.

apart from that, when the speed was reduced to 3Mhz, and the integrity test was repeated:

"INFO:IMPACT 2130: Boundary scan test failed.Please check tdi ->tdo connection between the cable and device'1'."

How do i perform this test?

 

 

 

Thanks in advance

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Xilinx Employee
iguo
Posts: 182
Registered: ‎08-10-2008
0

Re: Boundary scan is not identifying all the devices

The recognized FPGA and PROM are located at the downstream of the JTAG chain, right? If so, the connection between the Cable TDO to the first device's TDI, or the first's TDO to the 2nd'TDI, or the 2nd's TDO to the 3rd's TDI, have some issues. Can you bypass some or all of them? If then the chain can be identified, this means you do have some connection issues. Then you place the device back into the chain one by one, to find out which link is broken.