Istype 'collapse'
Collapse Combinational Node Attribute

Syntax

signal_name [,signal_name] [PIN|NODE] ISTYPE 'collapse' ;

Use

Signal attribute 'collapse' indicates that this combinational node can be collapsed (removed) by both the ABEL compiler and the Xilinx CPLD fitter. The opposite attribute is ISTYPE 'keep'.

Example

In the following example, signal b is given the 'collapse' attribute:

module coll_b
a,c,d,e pin ;
b pin istype 'collapse'

equations
a = b & e;
b = c & d;

end

The resulting equation collapses b out of the equations:

a = c & d & e ;