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AR# 50899

14.x Timing Analyzer - Incorrect values in the data sheet section when tri-state buffers are used with OFFSET OUT constrain

Description

The data sheet section of the Timing Report shows the same output delays for paths coming from different sources.

Solution

The delay reported refers to the path coming to the Enable signal for the tri-state buffer and for the data it shows the same value. This can happen when the tri-state output buffers are instantiated/inferred. 928895_OBUFT_tristate_path_datasheet_val.JPG

This is a known issue with the data sheet section of the Timing Report.

The values in the detailed section of the Timing Report are correct.

928895_OBUFT_tristate_path_offset_out_val.JPG

AR# 50899
Date Created 11/12/2012
Last Updated 11/12/2012
Status Active
Type General Article
Devices
  • Spartan-6
Tools
  • ISE Design Suite - 13
  • ISE Design Suite - 14