struct

Help/presentation_examples/blink/verification/counter_formal.sv

@@ -0,0 +1,48 @@
+`default_nettype none
+
+module counter_formal (
+    input wire clk,     // global clock
+    input wire reset,   // synchronous reset signal
+    (*anyseq*) input wire en,      // enable signal
+    input wire strobe,   // output strobe
+    input wire [counter.WIDTH-1:0] counter_reg 
+
+);
+
+`ifdef VERIFIC
+internal_check: assert property (@(posedge clk)
+                        disable iff (reset)
+                       en && (counter_reg==11)|=>(counter_reg==10)) ;
+
+decrease_enable_check: assert property (@(posedge clk)
+                            disable iff (reset || !en)
+                            (counter_reg >0 ) |=> (counter_reg == $past(counter_reg) - 1));
+
+roll_enable_check: assert property (@(posedge clk)
+                            disable iff (reset || !en)
+                            (counter_reg == 0 ) |=> (counter_reg == counter.INITIAL_VALUE));
+
+max_value_assert_check: assert property (
+                            @(posedge clk)
+                            (counter_reg <= counter.INITIAL_VALUE)
+);
+
+cover_0: cover property(
+        @(posedge clk)
+        (counter_reg == 0)
+);
+
+cover_2stb: cover property(
+        @(posedge clk)
+        (strobe == 1) |-> ##[+] (strobe == 1)
+);
+
+
+`endif
+
+endmodule
+
+bind counter counter_formal counter_f_inst(.*);
+
+
+//testing: assert property (@(posedge clk)(counter_reg==111)|=>(counter_reg==10));