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AR# 33455

SPI-4.2 Lite v5.1 - "ERROR:LIT:554 - OBUFTDS symbol..."


Any SPI-4.2 Lite v5.1 core generated for Spartan-6 FPGA and used in ISE 11.3/11.4 software will return the following error in Map:

ERROR:LIT:554 - OBUFTDS symbol


f" (output signal=TDat_P(4)) has its I input pin driven by an ODDR2 that is

using its D1 input. However, no ODDR2 was found driving the corresponding T

input pin. This will cause the design to not work in hardware. Please ensure

that OBUFTDS symbol


f" (output signal=TDat_P(4)) has its T input pin driven by an ODDR2.


A patch for this issue is available.

The SPI-4.2 Lite v5.1 Rev1 patch can be downloaded at:


Installation Instructions

You must take the following steps to install the SPI-4.2 Lite v5.1 Rev1 patch:

1. Prior to installing the update, you must install ISE 11.3/11.4. Software downloads can be found here:


2. Unzip the patch ZIP archive to your Xilinx installation directory as pointed to by your XILINX path variable. The archive will ask whether to overwrite the existing files; select "Yes to All" and allow it to overwrite these files.

Revision History

09/16/2009 - Initial Release

AR# 33455
Date Created 09/09/2009
Last Updated 12/15/2012
Status Active
Type General Article