sequence and property operator summary

sequence:

concatenation:              seq1 ##1 seq2

overlap:                         seq1 ##0 seq2

ended detection:           seq1 ##1 seq2.ended    

repetition:                      seq1[*n:m]

first match detection:     first_match(seq1)            

or:                                  seq1 or seq2                     一个满足就行了

and:                               seq1 and seq2                   起始时间一致，终止时间可以不一致

length-matching and:    seq1 intersect seq2            seq1和seq2起始和终止时间一致

conditional qualification:    cond throughout seq       条件在seq期间始终成立

within:                                seq1 within seq2            时间跨度上seq2 包含 seq1

 

此外还有triggered，例如：

property  p_data_xfr(req,ack,enb,done);

     @(posedge clk) disable iff(qAbort.triggered)

          $rose(req)|=>qDataXfr(ack,enb,done);

endproperty

 

property operators

not:              not(read && write)    property is never occur

and:             prop1 and prop2

or:                prop1 or  prop2

if ... else ... :      if (expr) prop1  else prop2

if ... else if ... else     

|->:                    seq1|->prop

|=>:                   seq1|=>prop

 

 

下面举几个复杂的property

1. 条件

property p_busAbusB_allocation;

   if($rose(req_busA) && !busyA && !busyB)

        ##1 lock_busB && busyA ##[0:5] ackA ##[1:10] doneA && !busyA

   else if ($rose(req_busB) && !busyA && !busyB)

        ##1 lock_busA && busyB ##[0:10] ackB ##[1:20] doneB && !busyB

   else

        busyA||busyB |->buses_busy;

endproperty

 

2. 分布

property p_switch_prop;

   if(switch_enb)

       if(switch_select inside {2'b00,2'b01,2'b10,2'b11} )

            if(switch_select==2'b00 && $past(switch_select==2'b11))

                    ##1 lock_enb[*1:10]##1 done;

            else

                    lock_enb[*1:2] ##1 done;

endproperty