Reg. Scrambling in Simulink

Hello,

Im working on scrambling for one of the communication application. Im trying this with the "Scrambler" block in Simulink.

The idea is to use the polynomial "x^15+x+1" with an initial value, let us say 0xAB (hex value).

However, Im unable to get the expected result. I have studied the Help section of the block.

I guess Im missing something here, being a beginner with Simulink coding.

Suggestions please to understand this and get it working.