Blocking vs Non-blocking in Clocking Block

SystemVerilog
,
1

Hi,

Why do we use non-blocking for driving the signals to DUT while using clocking block and use blocking to sample the signal from DUT.

Thanks,

Mukul

2

In reply to mukul1996:

I don’t understand your question. You use a synchronous drive statement to make assignments to clocking block outputs. You do not use block or non-blocking assignments to read clocking block inputs.

3

In reply to dave_59:


interface arb_if(input bit clk); 
  logic [1:0] grant, request; 
  logic rst; 
  clocking cb @(posedge clk); 
    output request; 
    input grant; 
  endclocking 
  modport TEST (clocking cb, 
                output rst);  
  modport DUT (input request, rst, output grant); 
endinterface



module test(arb_if.TEST arbif); 
  initial begin 
    arbif.cb.request <= 0; 
    @arbif.cb; 
    $display("@%Ot: Grant = %b", $time, arbif.cb.grant); 
  end 
endmodule

Here in the above eg. arbif.cb.request is driven by non blocking. If I would have used blocking here, it would give me an error.why?