1 files changed, 61 insertions, 53 deletions
diff --git a/homework_2/SRC/scoreboard.sv b/homework_2/SRC/scoreboard.sv
index c442f57..a55c812 100644
--- a/homework_2/SRC/scoreboard.sv
+++ b/homework_2/SRC/scoreboard.sv
@@ -1,53 +1,61 @@
-// the design routes packets based on an address range, the
-// scoreboard checks that the packet's address is within valid
-// range.
-class scoreboard extends uvm_scoreboard;
-  `uvm_component_utils(scoreboard)
-  function new(string name="scoreboard", uvm_component parent=null);
-    super.new(name, parent);
-  endfunction
-`define LENGTH 4 
-  	bit[`LENGTH-1:0] 	ref_pattern;
-  	bit[`LENGTH-1:0] 	act_pattern;
-	bit 				exp_out;
-  
-  uvm_analysis_imp #(Item, scoreboard) m_analysis_imp;
-    
-  virtual function void build_phase(uvm_phase phase);
-    super.build_phase(phase);
-
-    m_analysis_imp = new("m_analysis_imp", this);
-    if (!uvm_config_db#(bit[`LENGTH-1:0])::get(this, "*", "ref_pattern", ref_pattern))
-			`uvm_fatal("SCBD", "Did not get ref_pattern !")
-  endfunction
-  
-  virtual function write(Item item);        
-    act_pattern = act_pattern << 1 | item.in;
-    
-    `uvm_info("SCBD", $sformatf("in=%0d out=%0d ref=0b%0b act=0b%0b", 
-                               item.in, item.out, ref_pattern, act_pattern), UVM_LOW)
-
-    // Always check that expected out value is the actual observed value
-    // Since it takes 1 clock for out to be updated after pattern match, 
-    // do the check first and then update exp_out value
-    if (item.out != exp_out) begin
-      `uvm_error("SCBD", $sformatf("ERROR ! out=%0d exp=%0d", 
-                                   				item.out, exp_out))
-    end else begin
-      `uvm_info("SCBD", $sformatf("PASS ! out=%0d exp=%0d", 
-                                  item.out, exp_out), UVM_HIGH)
-    end
-
-    // If current index has reached the full pattern, then set exp_out to be 1
-    // which will be checked in the next clock. If pattern is not complete, keep
-    // exp_out to zero
-    if (!(ref_pattern ^ act_pattern)) begin
-      `uvm_info("SCBD", $sformatf("Pattern found to match, next out should be 1"), UVM_LOW)
-		exp_out = 1;
-    end else begin
-      exp_out = 0;
-    end
-		
-  endfunction
-endclass
-      
-\ No newline at end of file
+// the design checks two valid sequence patterns and compares
+// expected output to monitored output in each cycle.
+class scoreboard extends uvm_scoreboard;
+  `uvm_component_utils(scoreboard)
+  function new(string name = "scoreboard", uvm_component parent = null);
+    super.new(name, parent);
+  endfunction
+
+  `define LENGTH 4
+  bit                                  [`LENGTH-1:0] act_pattern;
+  bit                                                exp_out;
+  bit                                                seen_1011;
+  bit                                                seen_1100;
+
+  uvm_analysis_imp #(Item, scoreboard)               m_analysis_imp;
+
+  virtual function void build_phase(uvm_phase phase);
+    super.build_phase(phase);
+
+    m_analysis_imp = new("m_analysis_imp", this);
+    act_pattern = '0;
+    exp_out = 0;
+    seen_1011 = 0;
+    seen_1100 = 0;
+  endfunction
+
+  virtual function write(Item item);
+    act_pattern = act_pattern << 1 | item.inp;
+    exp_out = ((act_pattern == 4'b1011) || (act_pattern == 4'b1100));
+
+    `uvm_info("SCBD", $sformatf("inp=%0d outp=%0d act=0b%0b", item.inp, item.outp, act_pattern),
+              UVM_LOW)
+
+    if (act_pattern == 4'b1011) begin
+      seen_1011 = 1;
+
+      `uvm_info("SCBD", $sformatf("Pattern found to match"), UVM_LOW)
+    end
+
+    if (act_pattern == 4'b1100) begin
+      seen_1100 = 1;
+
+      `uvm_info("SCBD", $sformatf("Pattern found to match"), UVM_LOW)
+    end
+
+    if (item.outp != exp_out) begin
+      `uvm_error("SCBD", $sformatf("ERROR ! out=%0d exp=%0d", item.outp, exp_out))
+    end else if (exp_out) begin
+      `uvm_info("SCBD", $sformatf("PASS ! out=%0d exp=%0d", item.outp, exp_out), UVM_LOW)
+    end
+  endfunction
+
+  virtual function void report_phase(uvm_phase phase);
+    super.report_phase(phase);
+
+    if (!seen_1011 || !seen_1100)
+      `uvm_error(
+          "SCBD", $sformatf(
+          "Both patterns were not observed (seen_1011=%0d seen_1100=%0d)", seen_1011, seen_1100))
+  endfunction
+endclass