testcase framework

test/test_swacc_swmod/tb.sv

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+{% extends "lib/templates/tb_base.sv" %}
+
+{% block seq %}
+    logic [7:0] rd_data;
+    logic [7:0] latched_data;
+    int event_count;
+    latched_data = 'x;
+
+    ##1;
+    cb.rst <= '0;
+    ##1;
+
+    // Verify that hwif gets sampled at the same cycle as swacc strobe
+    cb.hwif_in.r1.f.value <= 'h10;
+    @cb;
+    event_count = 0;
+    fork
+        begin
+            ##0;
+            forever begin
+                cb.hwif_in.r1.f.value <= cb.hwif_in.r1.f.value + 1;
+                @cb;
+                if(cb.hwif_out.r1.f.swacc) begin
+                    latched_data = cb.hwif_in.r1.f.value;
+                    event_count++;
+                end
+            end
+        end
+
+        begin
+            cpuif.read('h0, rd_data);
+            @cb;
+        end
+    join_any
+    disable fork;
+    assert(rd_data == latched_data) else $error("Read returned 0x%0x but swacc strobed during 0x%0x", rd_data, latched_data);
+    assert(event_count == 1) else $error("Observed excess swacc events: %0d", event_count);
+
+
+    // Verify that hwif changes 1 cycle after swmod
+    fork
+        begin
+            ##0;
+            forever begin
+                assert(hwif_out.r2.f.value == 20);
+                if(hwif_out.r2.f.swmod) break;
+                @cb;
+            end
+            @cb;
+            forever begin
+                assert(hwif_out.r2.f.value == 21);
+                assert(hwif_out.r2.f.swmod == 0);
+                @cb;
+            end
+        end
+
+        begin
+            cpuif.write('h1, 21);
+            @cb;
+        end
+    join_any
+    disable fork;
+
+    // TODO: verify some other atypical swmod (onread actions)
+
+{% endblock %}