How to write a code to build a D flip flop?

I need a Linear Feedback Shift Register (LFSR) is able to generate a pseudo-random sequence.An LFSR is a shift register with feedback: so it should be a dynamic circuit (by dynamic I mean it must change with every value of input data) if it's not possible to write a code for D flip flop how can I make a changable circuit in simulink?

Answer 1

[Thomas]

You could use the D flip flop in simulink directly. http://www.mathworks.com/help/simulink/ref_extras/dflipflop.html