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84 Xilinx Development System
Xilinx System Generator v2.1 Reference Guide
uses the Xilinx LogiCORE Adder Subtractor V5.0. Otherwise, the block is
implemented as a synthesizable VHDL module.
The Core datasheet can be found on your local disk at:
%XILINX%\coregen\ip\xilinx\eip1\com\xilinx\ip\baseblox_v5_0\do
c\addsub.pdf
CMult
The Xilinx CMult block implements a gain operator, with output equal
to the product of its input by a constant value. This value can be a
MATLAB expression that evaluates to a constant.
Block Parameters Dialog Box
The block parameters dialog box can be invoked by double-clicking the icon in your
Simulink model.
Figure 3-56: CMult block parameters dialog box
Parameters specific to the CMult block are:
• Value of Constant: may be a constant or an expression. If the constant cannot
be expressed exactly in the specified fixed point type, its value is rounded and