[CU]6.5seqr&driver-m_sequencer

1.m_sequencer

(1) 所有的sequence都有一个m_sequencer句柄.

virtual class uvm_sequence #(type REQ=uvm_sequence_item, type RSP=REQ) extends uvm_sequence_base;

class uvm_sequence_base extends uvm_sequence_item;

class uvm_sequence_item extends uvm_transaction;
    ...
 protected uvm_sequencer_base m_sequencer;
    ...
    virtual function void set_sequencer(uvm_sequencer_base sequencer);
        ...
        m_sequencer=sequencer;
        ...
    endfunction

endclass

2.m_sequencer的赋值

(1)所有sequence都要在sequencer中启动,如tr_seq.start(env.vsqr). 当sequence启动的时候, 在sequence的task start内,会调用set_item_context函数; 在set_item_context函数内,会调用set_sequencer函数.

(2) set_sequencer函数会使m_sequencer句柄指向执行当前sequence的sequencer,即指向env.vsqr.

//src/seq/uvm_sequence_base.svh
virtual task start(uvm_sequencer_base sequencer, uvm_sequence_base parent_sequence=null, int this_priority=-1, bit call_pre_post=1);
    ...
    set_sequencer(sequencer);
    ...
endtask

//src/seq/uvm_sequence_item.svh
virtual function void set_sequencer(uvm_sequencer_base sequencer);
    m_sequence=sequencer;
    m_set_p_sequencer();
endfunction

virtual function void m_seq_p_sequencer();
    return;
endfunction