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AR# 18759

6.1 System Generator for DSP - Why do I get a "Cannot solve algebraic loop involving block ..." error with my Black Box?

Description

General Description: 

Why do I get a "'Cannot solve algebraic loop involving block ..." error with my Black Box?

Solution

Make sure to comment out the "this_block.tagAsCombinational;" in the "blackbox_config.m" file for the Black Box, if you have at least one port that is not combinatorial. 

 

Example from a "blackbox_config.m file": 

% System Generator has to assume that your entity has a combinational feed through;  

% if it doesn't, then comment out the following line: 

this_block.tagAsCombinational; 

 

If you are seeing this problem, but are not using a BlackBox, please see (Xilinx Answer 19941).

AR# 18759
Date Created 09/03/2007
Last Updated 05/16/2014
Status Archive
Type General Article