Change the output data type

Question

Ho 2023-8-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2005927-change-the-output-data-type

回答： Sahas 2024-12-18，6:28

AM.slx

I have a simulink model as follows

As you can see the data output is in the form fixed fixdt(1,14,12). Can anyone help me convert the output to fixdt(1,14,13)? what block do i have to use to do that? This is my model

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Kiran Kintali 2023-8-8

Please consider using fixed point designer to analyze ranges and use better fixed point types in the blocks.

https://www.mathworks.com/products/fixed-point-designer.html#automated-data-typing

Kiran Kintali 2023-8-9

在 MATLAB Online 中打开

AM_modified_23a.slx

Found few incorrect constant types. For example you had a constant block where '1' cannot be represented with the output type set on the block.

>> a = fi(0, 0,14,14)
a = 
     0
          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 14
        FractionLength: 14
>> a.range
ans = 
                   0   0.999938964843750
          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 14
        FractionLength: 14
>> 

https://www.mathworks.com/matlabcentral/fileexchange/64495-fixed-point-made-easy-for-fpga-programming

Attached model with the necessary changes.

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Answer 1

Sahas 2024-12-18，6:28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2005927-change-the-output-data-type#answer_1555954

Hi @Ho,

MathWork's "fixdt" function creates a "Simulink.NumericType" object describing a fixed-point or floating-point data type. You can utilize this function, in a "Data-type Converter" block and get the desired output data type. Follow the steps below and get the desired output data type:

Double click the DTC block to open it's Block Parameters.
In the Output Data Type field choose "<data type expression>".
Enter the required output data type following the "fixdt" function conventions.
Assuming that the Value is in the valid range, you will get the desired output data type as shown in the image below: