c. Voltage and current monitoring and control for the Maxim Integrated power system is available through either the VCU108 system controller or via the Maxim Integrated PowerTool software graphical user interface.

d. If 12V Power LED (DS26 on the KCU105) is not Green upon power up, then 12VDC is not being delivered to the KCU105 power input connector.

Follow these steps:

The VCU108 uses a USB A-to-micro-B cable plugged into the VCU108 Digilent USB-to-JTAG module, U115, through connector J106.

A 2-mm JTAG header (J3) is also provided in parallel for access by Xilinx download cables such as the Platform Cable USB II.

a. USB A-to-micro-B cable:

1. Is the cable visible in Device Manager?

    

   If the three items highlighted in the figure below are visible in Device Manager, this confirms that your USB cable is operational and has been correctly identified.
   

2. Are cable drivers loaded correctly? Drivers for this cable should be included in the Vivado Design Tools installation.
   However, if problems are experienced with USB A-to-micro-B cable connection, a Digilent plug-in can be downloaded from the link below.
    
   For installation, please follow the guidelines in the document provided in the downloaded files:
   http://digilentinc.com/Products/Detail.cfm?NavPath=2,66,768&Prod=DIGILENT-PLUGIN.
   
   This plug-in requires Adept systems 2.4 or later for Windows and Adept systems 2.3.9 or later for Linux.
   Adept software is available from Digilent:
   http://digilentinc.com/Products/Detail.cfm?NavPath=2,66,828&Prod=ADEPT2.
3. Check system properties and environment variables.
   For information on environment variables, see (Xilinx Answer 11630).


4. Is the USB port enabled?
   You can reboot your system to re-initialize the USB buses.


5. Are Xilinx tools correctly installed? (Vivado Hardware Manager or ILA)
   For supported software version information, see the Kit Product Page:
   http://www.xilinx.com/products/boards-and-kits/vcu108.html#overview
   
   If an issue is suspected with the tools installation, see the Installation and Licensing Guide (make sure to use the most recent version of tools and associated documentation which supports the VCU108).
   http://www.xilinx.com/support/documentation/sw_manuals/xilinx2015_1/ug973-vivado-release-notes-install-license.pdf

    

    

6. Is the Operating System (OS) being used Windows 7?
   If so, please see (Xilinx Answer 41442) and (Xilinx Answer 44397).
   

1. Is the cable visible in Device Manager?
   
2. Are cable drivers loaded correctly? Drivers for this cable should be included in the Vivado Design Tools installation.
   However, if problems are experienced with the Platform Cable USB II connection, please follow the uninstall and reinstall instructions in (Xilinx Answer 44397).
   
   
3. Check system properties and environment variables.
   For information on environment variables, see (Xilinx Answer 11630).


4. Is the USB port enabled? You can reboot your system to re-initialize the USB buses.


5. Are Xilinx tools correctly installed? (Hardware Manager or ILA)
   For supported software version information, see the Kit Product Page:
   http://www.xilinx.com/products/boards-and-kits/vcu108.html#overview
   If an issue is suspected with tools installation, see the Installation and Licensing Guide (make sure to use the most recent version of tools and associated documentation which supports the VCU108).
   http://www.xilinx.com/support/documentation/sw_manuals/xilinx2015_1/ug973-vivado-release-notes-install-license.pdf

    

    

6. Is the Operating System (OS) being used Windows 7?
   If so, please see (Xilinx Answer 41442) and (Xilinx Answer 44397).
   

If the above steps do not enable you to connect, please review the Support Webpage for your available Support options.

4. JTAG Initialization

The status of the board JTAG chain is checked using Xilinx Tools (Hardware Manager in Vivado).

To check to see that the JTAG chain is initialized correctly, follow this JTAG Initialization Test Case:

1. Remove any FMC cards from VCU108.
2. Set the mode switch SW15 for JTAG mode (101).

3. Power up VCU108 on the bench (not in a PC chassis).
4. Connect the Digilent USB A-to-micro B cable to the VCU108 (through the Digilent onboard USB-to-JTAG configuration logic module - U115 - through header J106).
5. Check that the Digilent device shows up in the Device Manager.
6. Ensure Xilinx tools (Vivado 2015.1 or later - preferably the latest version of tools that support the VCU108) are correctly installed.
7. Launch Vivado Hardware Manager - is the cable identified correctly?

• If not, see section 3. Cable detection above.
• If yes, but Vivado Hardware Manager did not discover and display the JTAG chain, slow down the cable speed (Output > Cable Setup).
• If yes, but Vivado Hardware Manager did not discover and display the JTAG chain and slowing the cable speed does not resolve the issue, see the following (assumes Digilent USB A-to-micro B cable is plugged into USB-to-JTAG configuration logic module U115 through J106):
  
  
  

If following the above steps does not allow you to initialize the JTAG chain, please disconnect the Digilent USB A-to-micro-B cable from the board and PC.

Connect the Platform Cable USB to header J3, and connect to your PC.

Ensure Xilinx tools (preferably the latest version of tools that support the VCU108) are correctly installed.

Launch Vivado Hardware Manager - is the cable identified correctly?

If following the above steps does not allow you to initialize the JTAG chain, please review the Support Webpage for your available Support options.

http://www.xilinx.com/support/service-portal.html

5. JTAG Configuration

If the JTAG chain initializes okay but JTAG configuration fails, check the following:

a) Verify the mode switch settings for JTAG configuration mode:
SW15-2 (M2) 1
SW15-3 (M1) 0
SW15-4 (M0) 1

b) In Vivado Hardware Manager, select a lower cable frequency and re-attempt configuration.

c) Pulse the PROG push button on the VCU108 (SW4).

Pulsing PROG will clear out any problems caused by power up ramp rate issues to the FPGA.

d) Review (Xilinx Answer 34904) - Xilinx Configuration Solution Center.

The Configuration Solution Center is available to address all questions related to Configuration.

If the above steps fail to enable JTAG configuration, please review the Support Webpage for your available Support options.

6. PCIe

If the VCU108 configures correctly, but the PCIe interface does not operate as expected, check the following:

a) Do NOT plug a PC ATX power supply 6-pin connector into J15 on the VCU108 board.

The ATX 6-pin connector has a different pinout than J15.

Connecting an ATX 6-pin connector into J15 will damage the VCU108 board and void the board warranty.

To install and power the board correctly, follow the instructions given in (UG1066) VCU108 Evaluation Board User Guide - Appendix E - Board Setup.

http://www.xilinx.com/support/documentation/boards_and_kits/vcu108/ug1066-vcu108-eval-bd.pdf

b) Check J74, lane width, is set correctly for your application.

c) See one of the following Answer Records, covering Known Issues for PCI Express, including Virtex UltraScale:

(Xilinx Answer 57945) - UltraScale FPGA Gen3 Integrated Block for PCI Express - Release Notes and Known Issues for Vivado 2013.3 and newer tools versions.

d) Download and run the VCU108 PCIe Example Design, whichever version is appropriate for your silicon and software version.

It is recommended to always use the latest version of software which supports the VCU108, and associated version of the VCU108 PCIe Example Design.

Follow the associated PDF.

All are available from the VCU108 Example Designs page.

http://www.xilinx.com/products/boards-and-kits/ek-u1-vcu108-es-g.html#documentation

e) Read the VCU108 PCIe Example Design document: VCU108 PDF xtp366.pdf and follow the instructions within.

f) Review (Xilinx Answer 34536) - Xilinx Solution Center for PCI Express.

The Solution Center for PCI Express is available to address all questions related to the Xilinx solutions for PCI Express.

If the above steps fail to resolve the PCIe issue, please review the Support Webpage for your available Support options.

7. Interface Tests

(Xilinx Answer 65464) - Virtex UltraScale FPGA VCU108 Evaluation Kit - Interface Test Designs can be run to ensure that the interfaces on the VCU108 are working correctly.

This Answer Record forms part of (Xilinx Answer 43748) - Xilinx Boards and Kits Debug Assistant.

If the above tests fail to resolve the issue, please review the Support Webpage for your available Support options.

8. Known Issues for VCU108

All Known Issues for the Virtex UltraScale FPGA VCU108 Evaluation Kit are listed in (Xilinx Answer 62603) - Virtex UltraScale FPGA VCU108 Evaluation Kit - Known Issues and Release Notes Master Answer Record.

If the issue you are faced with is not listed in the Known Issues and Release Notes Master Answer Record, and the steps above fail to resolve the issue, please review the Support Webpage for your available Support options.