CIC to HDL conversion
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Khalid Mirza
on 11 Aug 2017
Commented: Khalid Mirza
on 18 Aug 2017
Hi All,
When I try to generate HDL for a CIC filter I get the following error in the Workflow Manager : ??? Dimension 1 is fixed on the left-hand side but varies on the right ([3 x 1] ~= [:? x :?]).
Error in ==> CICDecimator Line: 1 Column: 1 ### Code generation failed: View Error Report
Error in Manager>wfa_generateCode at 0
The Error report shows as in the attached image.
Can anyone please help ? I am new to MATLAB-> HDL conversion.
PS : I do not have license for Filter Design HDL Coder, hence cant run the relevant example.
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Accepted Answer
Bharath Venkataraman
on 14 Aug 2017
I suggest using the CIC Decimation block in Simulink. This should generate HDL code.
More Answers (1)
Gautham Sholingar
on 17 Aug 2017
1) It seems that the error you are observing is related to variable sized inputs being used to define the CIC_filter. You could try to resolve this error by pre-allocating the sizes of the variables/arrays used in this process.
2) You can take a look at the documentation page associated with the specific example you are using to identify if the Filter Design HDL Coder toolbox is needed for your workflow. This may/may not be needed depending on your workflow.
3) The following documentation page talks about the restrictions of generating HDL code from CIC decimation filters:
Please refer to this page to understand if you are running into one of the reported limitations:
4) If these approaches do not help in resolving the issue, you can contact MathWorks Technical Support in the UK using the following link:
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