Nesting of frames in UVM?

Hello all,

 

I want to create nested frames/packets. My packet structure is shown below. I want to have nested frames(one or more frames within another frame) starting from 2nd byte of header and before the EOF/EOT. Please give me some guidance of how to include nested frames into another frames in UVM? What are the methods/macros in UVM which will be usefull in this regard. 

 

[/code] 

       rand bit [7:0] sync;      

       rand bit [7:0] sof;  

       rand bit [15:0] header; 

       rand bit [7:0] payload[];       

       rand bit [15:0] crc;

       rand bit [7:0] eof; //Or EOT(end of transmission)

[/code]

 

Any help/suggestion is appreciated.

Thanks,