Implementation of line coding schemes using simulink

Hi, I am currently doing a project, the aim is to implement line coding schemes in simulink. The schemes included are:Unipolar NRZ,RZ; polar: RZ, Manchester, differential Manchester;polar AMI. I have implemented using matlab, but the problem is the input is predetermined, the user was prompted to key in a bunch of 1s and 0s. Now, I was asked to incorporate the matlab code into simulink block.My question are:

1. Is it appropriate to use matlab function(in user defined function) in simulink to achieve this? 2. How to implement the coding scheme in real time. The input is pseudo random generator, so a continuous flow of 1s and 0s is expected?

Thanks in advance for any contribution.