During Xilinx ISE/LabTool installation the drivers for the platform cable should also be added to your system.

If this fails for any reason, the boundary scan will fail and Device Manager will show a yellow exclamation point next under Programming Tools or Unknown.

If this happens, please try reinstalling the drivers following the instructions at https://www.xilinx.com/support/answers/54381.html :

1. Disconnect the Xilinx USB cable. Alternatively, you can disabled the USB cable in the device manager first then re-enable them in step 5; in this case, you will not even need to reboot.

2. Open a Command Window (Start > then type cmd) as Administrator (right click > Run as Administrator)

3. Navigate to <Xilinx install>\bin\. This is usually c:\Xilinx\LabTools\LabTools\bin

4. Navigate to nt64 on a 64 bit system (usual) or nt on a 32 bit system.

5. Run wdreg -inf windrvr6.inf uninstall

6. Run wdreg -inf windrvr6.inf install

7. wdreg -inf xusbdrvr.inf uninstall

8. Run wdreg -inf xusbdrvr.inf install

9. Connect the Xilinx USB cable

Accept any installation prompts to accept Jungo cables or similar.

Detailed step-by-step below:

Reinstalling the Xilinx USB Cable Driver

Before you start: Make sure the Xilinx USB cable is unplugged from your computer.

Step 1 — Open the Command Prompt as Administrator

1. Click the Start button (Windows icon, bottom left of your screen)

2. Type cmd using your keyboard — you'll see an app called Command Prompt appear

3. Don't click it yet! Instead, right-click on it and choose "Run as Administrator"

4. A black window with white text will open — this is the Command Prompt. If Windows asks "Do you want to allow this app to make changes?", click Yes

Step 2 — Go to the Xilinx Folder

In the black window, type the following exactly and press Enter:

cd c:\Xilinx\LabTools\LabTools\bin

💡 You're telling the computer to go to the folder where Xilinx is installed. If Xilinx was installed somewhere different on your PC, that path may be slightly different.

Step 3 — Choose the Right Sub-Folder

Now you need to go into one more folder. Most modern PCs are 64-bit, so try this first — type it and press Enter:

cd nt64

💡 If you get an error message, your PC might be 32-bit. In that case type cd nt instead and press Enter.

Step 4 — Run the Driver Commands

You'll now type 4 commands, one at a time. After each one, press Enter and wait for it to finish before typing the next.

Command 1:

wdreg -inf windrvr6.inf uninstall

Command 2:

wdreg -inf windrvr6.inf install

Command 3:

wdreg -inf xusbdrvr.inf uninstall

Command 4:

wdreg -inf xusbdrvr.inf install

💡 These commands are removing and then reinstalling the cable drivers — like uninstalling and reinstalling an app to fix a problem.

Step 5 — Plug In the USB Cable

Once all 4 commands have finished, plug the Xilinx USB cable into your computer.

• Windows may pop up a message asking you to approve or install a driver — if it does, click Install or Yes to accept it.

• Wait for Windows to finish recognizing the cable (usually just a few seconds).