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Xilinx USB Cables - Frequently Asked Questions

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This answer record contains Frequently Asked Questions (FAQs) for Xilinx USB cables.

My 13.x Cable Driver install fails on Windows-7. How do I work around this?

Please consult the following solutions:

(Xilinx Answer 41442) 13.x - iMPACT cannot find Cable Driver after installing ISE 13.1 on Windows 7

(Xilinx Answer 44397)13.x iMPACT - Cable Driver installation passes on Windows 7, but the Jungo driver Windrvr6 does not operate or appear in the Device Manager

I have the new Platform Cable USB II (Model DLC10), but I cannot connect to it using Xilinx design tool versions 9.2i SP4 or earlier. What do I need to do?

The Platform Cable USB II driver is not available with design tool versions prior to 10.1 and must be installed manually.For complete details on obtaining and installing USB cable drivers, see the USB Cable Installation Guide (UG344):
http://www.xilinx.com/support/documentation/configuration_hardware.htm

NOTE: Beginning with ISE Design Suite 10.1, the Platform Cable USB II driver can be installed automatically during the design tool installation.

My ISE software version is pre-9.2.04. Will the new Platform Cable USB II (Model DLC10) work with this application?

Yes, Platform Cable USB II is backwards-compatible with all legacy design tools that support Xilinx USB cables. However, the driver for the cable might have to be installed.For complete details on obtaining and installing USB cable drivers, see the USB Cable Installation Guide (UG344).

NOTE: Beginning with software version 10.1, the Platform Cable USB II driver can be installed automatically during the design tool installation.

Which Xilinx design tools currently support Xilinx USB cables?

ISE Foundation/ISE WebPACK software
ChipScope Pro analyzer
Embedded Development Kit
System Generator for DSP

Is support for the Microsoft Vista operating system available for Xilinx USB cables?

Yes, 32-bit and 64-bit versions of Microsoft Vista are supported.For details, see the respective design tool user guide and the USB Cable Installation Guide (UG344): http://www.xilinx.com/support/documentation/configuration_hardware.htm.

Is there Linux-based operating system support for Xilinx USB cables?

Yes, Red Hat Enterprise Linux WS and SUSE Linux Enterprise are supported.For details, see the USB Cable Installation Guide (UG344) linked above.

I am using a Linux-based operating system that is not on the Xilinx list of supported operating systems (e.g., Fedora, Ubuntu, etc.). Will Xilinx USB cables work with these operating systems?

Possibly. Customers have successfully installed Xilinx USB cables on a number of unsupported Linux-based operating systems. However, Xilinx does not guarantee the reliability, performance, or suitability of such installations. Xilinx does not support the cable when operated on these operating systems as it is untested in these environments.

Is there Solaris operating system support for Xilinx USB cables?

No, there are currently no plans for Solaris support.

I have a Platform Cable USB model DLC9G (or DLC9LP), but I cannot connect to it using Xilinx design tool versions 8.1i sp3 or earlier. What do I need to do?

The drivers for DLC9G and DLC9LP were not delivered on the software installation CD/DVDs until software version 9.1i. If using a version earlier than 9.1i, you must either upgrade to the latest version of the design tool (recommended) or manually install the cable driver.For complete details on obtaining and installing USB cable drivers, see the USB Cable Installation Guide (UG344):http://www.xilinx.com/support/documentation/configuration_hardware.htm.

What is the minimum PC environment required for Xilinx USB cables?

The host computer must contain a USB host controller with one or more USB ports. The controller can reside on the PC motherboard, or can be added using an expansion or PCMCIA card. Xilinx USB cables support both USB 1.1 and 2.0 ports, although performance is optimal on USB 2.0 ports. For additional details, refer to the cable data sheets: Platform Cable USB Data Sheet(DS300) and Platform Cable USB II Data Sheet(DS593):
http://www.xilinx.com/support/documentation/configuration_hardware.htm.

Why does the Windows Found New Hardware Wizard run three consecutive times when the cable is first attached in Windows XP Professional environments?

Xilinx USB cables are entirely RAM-based products. Firmware is downloaded each time the cable enumerates. Each of the following operations causes a separate iteration of the Found New Hardware Wizard:

The first time the cable is attached to a physical port, an embedded vendor identifier (VID) and product identifier (PID) are transmitted to the host during enumeration. Windows uses the VID/PID combination to locate a device driver to perform the firmware download.
When the firmware executes, a new PID is transmitted to the host. Windows uses the VID and the new PID to bind a USB driver (windrvr6.sys) to the cable.
If the cable is attached to a high-speed port, a soft disconnect is performed by the cable firmware to switch from Full-Speed to High-Speed.

Windows creates a new instance in the registry for each physical port used to communicate with Xilinx USB cables. When the instance is created, the Found New Hardware Wizard sequence is repeated. Subsequent removal and reattachment to the same port does not invoke the Found New Hardware Wizard.

NOTE: The Found New Hardware Wizard does not appear when Xilinx USB cables are connected in Windows Vista environments.

Are Xilinx USB cables RoHS compliant?

All Xilinx USB cables currently in production (models DLC9G and DLC10) are compliant with the Restriction of Hazardous Substances (RoHS) directives. This means that Xilinx USB cables contain no lead, mercury, cadmium, or hexavalent chromium.

NOTE: Legacy cables (models DLC9 and DLC9LP) are not RoHS compliant, but are no longer in production.

Why do 24 MHz operations fail on some hardware systems?

At higher frequencies you might see IDCODE mismatch failures or problems identifying the chain in iMPACT. At 24 MHz, there is a timing window of approximately 30 ns for TDO to propagate from the target device to the cable with sufficient setup margin for sampling. Hardware systems using TDO buffers or logical devices between TDO and the cable can have excess TDO propagation delay causing the data to be incorrectly sampled.

Signal integrity issues increased by board noise can also be an issue. JTAG lines are often given low priority routing and, as a result, are prone to noise on the board. Putting the system in Reset or Quiet mode can often help in these cases.

In addition, some devices are not specified to operate properly at 24 MHz. Refer to the device data sheet for information about the maximum supported TCK_CCLK frequency. For additional details, refer t