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9–2
Chapter 9: Using Custom Library Blocks
Creating a Custom Library Block
Creating a Library Model File
To create a Library Model File for your custom block, follow these steps:
1. In MATLAB, change the current directory setting to: < DSP Builder install
path > \DesignExamples\Tutorials\BuildingCustomLibrary .
2. Open the Simulink Library Browser. On the File menu in the Simulink Library
Browser, point to New and click Library to open a new library model window.
3. Expand the Simulink Ports & Subsystems library in the Simulink Library Browser
and drag a Subsystem block into your model.
4. Click on the Subsystem text below the block and rename the block DelayFIFO .
1
You should always rename a block representing an HDL Subsystem to
ensure that all the generated entities in a hierarchical design are unique.
5. Click Save on the File menu and save the library file as NewLib.mdl .
Building the HDL Subsystem Functionality
To add functionality to the DelayFIFO block, follow these steps:
1. Double-click on the DelayFIFO block to open the NewLib/DelayFIFO subsystem
window.
2. Drag and drop a Shift Taps block from the Storage library in the Altera DSP
Builder Blockset into your model window. Insert the Shift Taps block between
the input and output blocks ( Figure 9–2 ).
Figure 9–2. Shift Taps Block
3. Double-click the Shift Taps block to open the Block Parameters dialog box.
Table 9–1 shows the parameters to set.
Table 9–1. Parameters for the Shift Taps Block (Part 1 of 2)
Parameter
Main Tab
Number Of Taps
Distance Between Taps
Optional Ports and Settings Tab
Use Shift Out Port
Use Enable port:
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
1
10
Off
On
Value
November 2013 Altera Corporation
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