Xilinx generate bsdl file

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Oct 27, Support Forums. Installation and Licensing. However; when configured to provide the functionality required for the operation of board to which it is being fitted some signals will not need full IO functionality. An IO signal is configured to be uni-directional; due to the information extracted from the BSDL file XJTAG will attempt to drive and read this signal during the connection test in order to identify any manufacturing faults; however in this situation non-existent errors will be reported and real errors may go un-detected.

The nature of the false error will depend on whether the modified signal is the only JTAG signal on the net. In the situation where the modified signal, originally with inout functionality, is the only JTAG enabled signal on the net there would be a stuck at fault reported.

XJTAG would tell the device to drive a pattern of zeros and ones from the device and then attempt to read that pattern back. If the signal has been configured as an output then the value captured would not reflect the value of the net. In the situation where there is more than one JTAG signal on a net XJTAG would report an error but not be able to provide any guidance as to the type of fault; the error report would say the net was either shorted to another net that is not accessible through JTAG or a non-JTAG pin is also driving the net.

If the modified signal is configured as an input the expected pattern would not be read back by either signal when driven by the modified signal but it would be read successfully when driven by the other signal. If the modified signal is configured as an output the expected value would never be read back correctly on the modified signal but always read correctly on the unmodified signal. In neither case the resulting error would be the same; an open circuit diagnosis would not be made as the board can communicate between the two signals, just not fully.

When faced with the problem of testing a board that contains configured devices there are a number of solutions:. Creating a modified BSDL file is not the best solution to work around these problems because in situations where there is only one JTAG signal on a net then short circuit faults and stuck at faults may go un-diagnosed.

It is not necessary to change the control cells which correspond to the 3-state pin of the pad that already have the proper value. The output and input values are design-dependent. Knowledge of the your application is necessary to set these. They cannot be automatically set based solely on the. A common method of modifying BSDL files to represent a configured device is to create a script that implements these changes. Skip to Navigation Skip to Main Content.

Toggle SideBar. Xilinx Support Community. Sign in to ask the community. Information Title. The information below is applicable to all Xilinx devices. Issue : The Boundary Scan test vectors must not drive pin A3 since this causes contention. This permits the Boundary Scan test to drive pin A3 and causes contention. You must create a post-configuration BSDL file based on your design information.