Changing incoming vectors (bits) and reshaping them without buffer delay on Simulink

Hello I am trying to take stream of bits (vector) and I'd like to perform some calculation

to check some condition.

On my setup, I have buffer then a custom MATLAB Function block.

In this way, I was able to 'cut' the vector (via buffer) and check conditions for each 'cut.'

And since there is a delay in buffer operation, for the first 'cut' the values are the initial condition

that I defined in buffer block, which I can simply discard during analysis.

Now my question is, is there a way to buffer my input vector without having those unwanted 'cut?'

In other words, is there a way to stack my incoming vector real time and at certain number of elements,

simply do my calculation (without buffer)?

I can live with the buffer block, but I think, as my model gets more detailed and sophisticated, it might cause

some problem in the future and I want to get rid of the possibility.

Thanks!