MATLAB DESIGN HDL CODER RELEASE NOTES User's Guide Page 379

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System Generator for DSP User Guide www.xilinx.com 379
UG640 (v 12.2) July 23, 2010
Bitstream Compilation
As shown below, you may select the NGC compilation target by left-clicking the
Compilation submenu control on the System Generator block dialog box, and selecting the
NGC Netlist target.
You may access additional compilation settings specific to NGC Netlist compilation by
clicking on the Settings... button when NGC Netlist is selected as the compilation type in
the System Generator block dialog box. Parameters specific to the NGC Netlist Settings
dialog box include:
Include Clock Wrapper: Selecting this checkbox tells System Generator whether the
clock wrapper portion of your design should be included in the NGC netlist file. Refer
to the topic
Compilation Results for more information on the clock wrapper.
Note:
If you exclude the clock wrapper from multirate designs, you will need to drive the clock
enable ports with appropriate signals from your own top-level design.
Include Constraints File: Selecting this checkbox tells System Generator whether the
constraints file associated with the design should be included in the NGC netlist file.
Note:
When the constraints file is excluded, you should supply your own constraints to ensure
the multi-cycle paths in the System Generator design are appropriately constrained.
Bitstream Compilation
The Bitstream compilation type allows you to compile your design into a Xilinx
configuration bitstream file that is suitable for the FPGA part that is selected in the System
Generator dialog box. The bitstream file is named <design>_cw.bit and is placed in the
design's target directory, where <design> is derived from the portion of the design being
compiled.
System Generator produces the bitstream file by performing the following steps during
compilation:
1. Generates an HDL netlist for the design;
2. Runs the selected synthesis tool to produce a lower-level netlist. The type of netlist
(e.g., EDIF for Synplify Pro, NGC for XST) depends on which synthesis tool is chosen
for compilation.
3. Runs XFLOW to produce a configuration bitstream.
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