1 files changed, 125 insertions, 0 deletions
diff --git a/tests/svinterfaces/svinterface_at_top.sv b/tests/svinterfaces/svinterface_at_top.sv
new file mode 100644
index 00000000..b5aa8c8f
--- /dev/null
+++ b/tests/svinterfaces/svinterface_at_top.sv
@@ -0,0 +1,125 @@
+
+
+module TopModule(
+    input logic clk,
+    input logic rst,
+    output logic [21:0] outOther,
+    input logic [1:0] sig,
+    input logic flip,
+    output logic [1:0] sig_out,
+    MyInterface.submodule1 interfaceInstanceAtTop,
+    output logic [15:0] passThrough);
+
+  MyInterface #(.WIDTH(4)) MyInterfaceInstance();
+
+  SubModule1 u_SubModule1 (
+    .clk(clk),
+    .rst(rst),
+    .u_MyInterface(MyInterfaceInstance),
+    .u_MyInterfaceFromTop(interfaceInstanceAtTop),
+    .outOther(outOther),
+    .sig (sig)
+  );
+
+  assign sig_out = MyInterfaceInstance.mysig_out;
+
+
+  assign MyInterfaceInstance.setting = flip;
+
+  assign passThrough = MyInterfaceInstance.passThrough;
+
+endmodule
+
+interface MyInterface #(
+  parameter WIDTH = 3)(
+  );
+
+  logic setting;
+  logic [WIDTH-1:0] other_setting;
+
+  logic [1:0] mysig_out;
+
+  logic [15:0] passThrough;
+
+    modport submodule1 (
+        input  setting,
+        output other_setting,
+        output mysig_out,
+        output passThrough
+    );
+
+    modport submodule2 (
+        input  setting,
+        output other_setting,
+        input  mysig_out,
+        output passThrough
+    );
+
+endinterface
+
+
+module SubModule1(
+    input logic clk,
+    input logic rst,
+    MyInterface.submodule1 u_MyInterface,
+    MyInterface.submodule1 u_MyInterfaceFromTop,
+    input logic [1:0] sig,
+    output logic [21:0] outOther
+
+  );
+
+
+  always_ff @(posedge clk or posedge rst)
+    if(rst)
+      u_MyInterface.mysig_out <= 0;
+    else begin
+      if(u_MyInterface.setting)
+        u_MyInterface.mysig_out <= sig;
+      else
+        u_MyInterface.mysig_out <= ~sig;
+    end
+
+  MyInterface #(.WIDTH(22)) MyInterfaceInstanceInSub();
+
+  SubModule2 u_SubModule2 (
+    .clk(clk),
+    .rst(rst),
+    .u_MyInterfaceFromTopDown(u_MyInterfaceFromTop),
+    .u_MyInterfaceInSub2(u_MyInterface),
+    .u_MyInterfaceInSub3(MyInterfaceInstanceInSub)
+  );
+
+    assign outOther = MyInterfaceInstanceInSub.other_setting;
+
+    assign MyInterfaceInstanceInSub.setting = 0;
+    assign MyInterfaceInstanceInSub.mysig_out = sig;
+
+endmodule
+
+module SubModule2(
+
+    input logic clk,
+    input logic rst,
+    MyInterface.submodule2 u_MyInterfaceInSub2,
+    MyInterface.submodule1 u_MyInterfaceFromTopDown,
+    MyInterface.submodule2 u_MyInterfaceInSub3
+
+  );
+
+  assign u_MyInterfaceFromTopDown.mysig_out = u_MyInterfaceFromTop.setting ? 10 :  20;
+
+   always_comb begin
+      if (u_MyInterfaceInSub3.mysig_out == 2'b00)
+        u_MyInterfaceInSub3.other_setting[21:0] = 1000;
+      else if (u_MyInterfaceInSub3.mysig_out == 2'b01)
+        u_MyInterfaceInSub3.other_setting[21:0] = 2000;
+      else if (u_MyInterfaceInSub3.mysig_out == 2'b10)
+        u_MyInterfaceInSub3.other_setting[21:0] = 3000;
+      else
+        u_MyInterfaceInSub3.other_setting[21:0] = 4000;
+   end
+
+    assign u_MyInterfaceInSub2.passThrough[7:0] = 124;
+    assign u_MyInterfaceInSub2.passThrough[15:8] = 200;
+
+endmodule