60 www.xilinx.com System Generator for DSP User Guide
UG640 (v 12.2) July 23, 2010
Chapter 1: Hardware Design Using System Generator
Optional Input Ports
This example shows how to use the parameter passing mechanism of MCode blocks to
specify whether or not to use optional input ports on MCode blocks.
The following M-code, which defines M-function xl_m_addsub is contained in file
xl_m_addsub.m:
function s = xl_m_addsub(a, b, sub)
if sub
s = a - b;
else
s = a + b;
end
The following diagram shows a subsystem containing two MCode blocks that use M-
function xl_m_addsub.
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