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Chapter 13: Troubleshooting
13–9
Troubleshooting Issues
A valid value of this parameter is a series of digits, one for each of the inputs on the
block (from top to bottom), with a 0 indicating direct feedthrough, and a 1 indicating
that all paths to outputs from this input are registered.
1
Specifying a value of 1 for an input, when it is in fact direct feedthrough,
causes Simulink to treat combinational paths as registered, and results in
incorrect simulation results.
Adjust the order in which Simulink exercises all the blocks in a feedback loop, by
giving blocks a priority value. This procedure is useful if you know which block is
providing the correct initial values.
The priority of a block can be set with the General tab in the block properties for a
block. A lower value of priority causes DSP Builder to execute a block before a block
with a higher value.
Parameter Entry Problems in the DSP Block Dialog Box
There are issues with the Block Properties dialog box for the DSP block. Some
interdependencies require that you close and re-open the dialog box to edit further
parameters. This issue may be occur after a warning message issues or when a
required option is not available.
For example, if you change the Output Rounding Operation Type you may get an
error when Symmetric is selected for the Output Saturation Operation Type . If this
occurs, set the saturation type to None (wrap) and close the dialog box. Reopen the
dialog box and you can select now select Symmetric saturation.
DSP Builder System Not Detected in Qsys
Qsys may not detect DSP Builder systems whose hardware has been generated using
previous versions of the DSP Builder software. Altera does not guarantee backwards
compatibility of these modules when you use them in Qsys.
To workaround this issue, follow these steps:
1. Remove the < dspbuilder system name >_dspbuilder directory that the older DSP
Builder version generated.
2. Re-run compilation from the Signal Compiler block with the current DSP Builder
version.
3. Refresh the Qsys system.
MATLAB Runs Out of Java Virtual Machine Heap Memory
For a very large design (containing many thousand blocks), MATLAB may have
insufficient heap memory available for the Java virtual machine and issues an error
message of the form:
“OutofMemoryError: Java heap space”
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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