Data generation for CRC-16 CCITT

I want to test my CRC encoder/decoder by sending packet based data by 
hdl test bench, i have sent byte by byte data on each clock cycle and 
store it on ram memory locations,and test it successfully.Now next step 
to test my design is to take packet based data how can i handle it with 
ease and generate from test bench i tried it as follow for data 
generation?

//32-byte packet.
reg        [255:0] data;


data=256'hABCD......01(a total length of 32 byte)
kindly guide me as i am new-by to hdl.