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AR# 22293

Parallel Cable IV - "ERROR: Device Control LPT_WRITE_CMD_BUFFER Failed"

Description

Keywords: PC4, iMPACT, PCIV, PC-IV, Parallel-IV

When I use the Parallel-IV cable, the following error appears in the iMPACT log window:

"DeviceIoControl LPT_WRITE_CMD_BUFFER Failed."

Why does this occur?

Solution

This is an intermittent problem that some computers have with the cables. This problem occurs only because of an issue with the Parallel Port. The USB Platform Cable is not affected by this problem; therefore, it can be used at 6 MHz.

An updated version of the PCIV cable firmware is being field tested. This version improves cable operation, and should fix communication problems reported by a small population of customers. If you are interested in trying this fix, contact Xilinx Technical Support:
http://www.xilinx.com/support/services/contact_info.htm

Make sure there is no other software using the parallel port to access hardware. This could be in the form of a printer, dongle, or other software looking for hardware on the parallel port.

Change the cable speed in iMPACT operating on the cable by selecting Output -> Cable Setup. If the problem is with the Parallel-IV cable, try connecting as a Parallel-III cable in the Cable Setup menu.

Try using the 6.3.03 release of iMPACT, if this software is available.

If you are still experiencing problems, contact Xilinx Technical Support:
http://www.xilinx.com/support/services/contact_info.htm.

AR# 22293
Date Created 11/02/2005
Last Updated 05/09/2006
Status Active
Type General Article