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AR# 20398

6.3i ChipScope Pro - WARNING:Place - "The structured logic associated with a shift register.."

Description

General Description: 

When running PAR on a design containing ChipScope cores, the following warning might be encountered: 

 

WARNING:Place - The structured logic associated with a shift register could not be placed in such a way as to use the appropriate fast connections. Shift registers should flow through every slice down through the clb(s) that they use. The relative placement required by the logic was impossible to resolve.  

The following components are involved in this logic:  

 

SLICE U_ila_pro_0/ila_pro0/i_no_d/u_ila/u_trig/u_tm/g_nmu/0/u_m/u_mu/i_mut_gandx/u_ma

Solution

This warning can be safely ignored. The tool is just letting you know that it cannot cascade the SRL16Cs in the most optimal way possible. This placement is what is needed for ChipScope to run as it is optimally cascading the carry logic that is connected to the SRL16C's. This warning will be removed in the 7.1 release.

AR# 20398
Date Created 09/03/2007
Last Updated 05/16/2014
Status Archive
Type General Article