Nesting of frames in UVM?

[swapnilm]

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,

[swapnilm]

Can someone please give me some idea about it? What could be the UVM methods to create nested frames? Would appreciate it.

 

Thanks,

[wushan]

To swapnilm,

 

Maybe the Virtual Sequences mechanism will fit your requirement. Refer to Universal Verification Methodology (UVM) 1.1 User’s Guide Chapter 4.8.

 

Best regards

[mea1201]

If you're talking about different encapsulations, then you can go about it in one of two possible ways:

1. Define a single packet model that is flat, and includes knobs (random and non-random) to determine if a particular header is present or not.
2. Define a class hierarchy/family of packet types.

I think #1 is simpler and less unwieldy to deal with.

 

Does that sort of address your question?

[swapnilm]

Hi mea1201,

 

I actually want to insert one(or more) packets into another packet.This encapsualtion of pkts will start from the second byte of the header. I didnt really get what you said. Could you please elaborate a little more.

Thanks