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AR# 13406

4.1i, Spartan-IIE - Several LVPECL/LVDS pin pairs do not work on the board (Pin pairs in the package file are incorrect)


Keywords: polarity, differential, signal, pair

The N-side and P-side pin pair descriptions for Spartan-IIE package files are reversed in some cases; this causes the LVPECL/LVDS pairs to not function on the board.

This affects the following Spartan-IIE device and package combinations:

- FT256: All Spartan-IIE devices (XC2S50E, XC2S100E, XC2S150E, XC2S200E, XC2S300E).
- TQ144: XC2S50E, XC2S100E. FG456: XC2S100E, XC2S150E.


This problem is fixed the 4.2i and later software releases.

If you are still using version 4.1i, you must download a patch to fix this problem at:

Download the package file to $Xilinx/spartan2e/data, where "$Xilinx" is your 4.1i installation directory.

These changes are reflected in the data sheet:

Data Sheet - http://www.xilinx.com/support/documentation/data_sheets/ds077.pdf
Interactive data sheet pin-out compatibility tool (as of 12/20/01) - http://www.xilinx.com/applications/web_ds_sp2e/pin_comp/
AR# 13406
Date 03/27/2009
Status Archive
Type General Article
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