SOC中环境握手的规则

virtual function void back_write(input bit[31:0] addr, input bit[31:0] data);
  void'(uvm_hdl_deposit(path+addr, data));
endfunction:back_write

virtual function void back_read(input bit[31:0] addr);
  bit[31:0] val;
  void'(uvm_hdl_read(path+addr, val);
  return val;
endfunction:back_read

virtual task send_msg(integral msg);
  integral val = 0;
  `uvm_info("send_msg", $sformatf("send sync msg: addr='h%0h, msg='h%0h", SYNC_ADDR, msg), UVM_LOW)
  back_write(SYNC_ADDR, msg);
endtask:send_msg

virtual task wait_msg(integral msg);
  integral val = 0;
  do begin
    #10us;
    val = back_read(SYNC_ADDR);
  end while(!(val === msg));
  `uvm_info("send_msg", $sformatf("send sync msg: addr='h%0h, msg='h%0h", SYNC_ADDR, msg), UVM_LOW)
endtask:wait_msg