Change the output data type

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

[Kiran Kintali]

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]

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.

Answer 1

[Sahas]

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:

For more information on "fixdt" function and "DTC" block, refer to the following MathWorks documentation links:

• https://www.mathworks.com/help/simulink/slref/simulink.numerictype.fixdt.html
• https://www.mathworks.com/help/simulink/slref/datatypeconversion.html

Hope this is beneficial!