How do you pad zeros to a discrete element-based input?

Hello, For my Simulink code, I am attempting to pad my input data with zeroes. The format should be as follows:

0000000data0000000data...

However, the data is not taken in by frame, and I cannot convert it since I want to use HDL generation. How is this achieved?

Answer 1

[Kiran Kintali]

you may want to try using bitconcat function supported by HDLCoder.

 z = fi(0, 0,7,0); % create 7-bit zero word
 y = bitconcat(z,u,z) % u in the input word in fixed-point format

Answer 2

[Bharath Venkataraman]

If your input data is a frame, you can pad zeros and then use the To Sample block for the HDL input.

If you are dealing with samples, I suggest using a counter block followed by a switch block. When the counter is < specified length, pass in zeroes, otherwise send in the data.

[Daniel Yang]

Can you provide a more tangible explanation for method 1? It is possible to force the input data as a frame, but in order to use the data for HDL code, it needs to be unbuffered, rather than simply converted to the sample mode, right?