PN correlator and GLFSR source purpose and how to use it

Hi all,
I am using GLFSR source and PN correlaor blocks in my tranceiver for
frame
synchronization. My Question is that does PN correlator is used for
frame
synchronization? if yes then how to use these blocks.

My flow graph is attached with this mail.You can see that I have used
the
GLFSR source and PN correlator for synchronization but using like this
its
not working means my frame have some delay. and please confirm me that
PN
correlator is used for frame synchronization?

any reply will be much appreciated I am asking these easy questions
because
I am in learning phase.
regards,
Irfan U.