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Switching between data_items during simullation

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Hi , 


I would like to use some data items in one test: frame_packet,  short_packet , illegal_packet.


In the uvm documentation i found that in order to switch between packets i should use factory setting in the test:




according to my understanding this completly replaces that data item and does not leave option to use frame_packet in this test.


Is there any other way to do it?







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why not just write a sequence which selects one of these packets?



// short skeleton, you can improve this scheme ...

class bla extends uvm_sequence;

frame_packet a;

short_packet b;

illegal_packet c;


rand int sel;


task body();


0: uvm_do(a);

1: uvm_do(B);

2: uvm_do©;



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