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AR# 9657

3.1i Virtex PAR - Warning: place 1795: The placement of the source component must be in the same CLB column as the output LVDS pair


Keywords: PAR, LVDS, LVPECL, place 1795, CLB column, source, component, output

Urgency: Standard

General Description: When running through PAR, the following warning might be

WARNING:Place:1795 - The placement of the source component TXD11 must be in the
same CLB column as the asynchronus output LVDS IOB pair $3I2/$1N104 and
$3I2/$1N169. This will minimize the skew issues involving the top and bottom

Does this indicate a problem? If so, when can this warning be safely ignored?


This warning states that the driving CLB is not in the same column as
the output pad. While this can add extra delay to that route, it will not cause
an error - as long as your design can still meet timing. The warning is simply
stating that there is a potentially better placement for this signal.
AR# 9657
Date Created 09/01/2007
Last Updated 10/21/2008
Status Archive
Type General Article