MATLAB: Error in generate HDL code of simulink block: “Two-Channel Analysis Subband Filter”.

HDL Codersimulinktwo-channel analysis subband filter hdl

Good Sir, I want to generate a HDL code from my Simulink model. My problem is with the Two-Channel Synthesis/Analysis block. My model is work normally with simulation but when I try to generate HDL code, I get this errors massages: Error: Cannot find the implementation for block 3-Level Analysis Filter Bank/Two-Channel Analysis Subband Filter/Highpass FIR Decimation'. To continue code generation, and avoid this error, you may choose to 'Comment out' this block. How can solve this problem?

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"Cannot find the implementation for block" indicates that the specified block is not supported for HDL code generation. (The message is more direct and clear in newer versions of the product.) You will need to replace this block with a different block or set of blocks.

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MATLAB: HDL Coder reset control

Andrew,

There is a block-level parameter that allows the reset to be disabled on a block by block basis. You can access this parameter by right-clicking on a Delay block and choosing HDL Code -> HDL Block Properties. On this dialog, change ResetType from 'default' to 'none'. This sets the register generated from that Delay block to be generated with no reset.

The ResetType block parameter chooses whether a block will generate a reset or not. 'None' will not generate a reset; 'default' will generate whatever sort of reset is configured for HDL Coder in its Global Settings Configuration Parameters pane.

Since you have stated that you want the default to be no reset, the GUI-based interactive approach will be tedious. To script this, you can use the hdlset_param command, which has the syntax:

 hdlset_param(block, parameter, value)

You can combine this with find_system to set all the Delay blocks in your model to have no reset:

 hdlset_param(find_system('modelname', 'BlockType', 'Delay'), 'ResetType', 'none')

This will change the value of the HDL block parameter on all Delay blocks in your model to 'none'. Block parameters are persistent and are saved in the model, so this should be a one-time configuration. You can then go back and re-add a reset to those Delay blocks that require it.

MATLAB: HDL generator problems

Simulink HDL Coder currently does not support this particular block (FFT block in Signal Processing Blockset). To find all the blocks supported by Simulink HDL Coder, type "hdllib" from MATLAB prompt.

There are 2 FFT blocks in HDL demo library that you can use for HDL code generation. "HDL Streaming FFT" block supports the Radix-2 with decimation-in-frequency (DIF) algorithm. "HDL FFT" block implements a minimum resource FFT architecture and supports the Radix-2 with decimation-in-time (DIT) algorithm.

John

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