AR# 10370: 6.3i Modular Design - "ERROR:NgdBuild 604 (or 605) - No driver was found for logical net 'netname' for this modular design..." (Verilog)
AR# 10370
6.3i Modular Design - "ERROR:NgdBuild 604 (or 605) - No driver was found for logical net 'netname' for this modular design..." (Verilog)
描述
Keywords: translate, initial, ports, undefined, direction
Urgency: Standard
General Description: During the modular design initial flow for my Verilog design, the following errors occur:
"ERROR:NgdBuild:605 - No load was found for logical net 'N_top2b' in this modular design. Ports with an undefined direction were found connected to the net. Please assign a direction to these ports."
"ERROR:NgdBuild:604 - No driver was found for logical net 'N_mod_c_out' for this modular design. Ports with an undefined direction were found connected to the net. Please assign a direction to these ports."
解决方案
In modular design, when you instantiate a module in a design's top-level, the direction of the module ports must be declared.
If the direction of the ports is not declared in the top-level, NGDBuild cannot determine whether the ports are "input to" or "output from" the module.
For example:
Top ( ...); input ...; output ...;
// module_a instantiation and port map module_a instance_a ( ...);
endmodule //End of top- level
//Declaration of module_a in top-level Verilog module_a (...); input ...; output ...; endmodule //End of module_a declaration