VHDL code for RCOM message

Hi,

I am presently writing Testcases and Test benches for my Communication
control modules which are used in Boeing spoilers.

I need the code for checking (validate and verify) a Message format of
my RCOM (remote electronic unit Communication). The message format is


           < StartBit> <Header Word><1-29 data word><checker word(odd
vertical parity)>

Here each word is 32-bit in data word
Header word is 5-bit

It would be a great helpful if any one gives clear steps for verify
this format

Thanks,
Sreeniv.