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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
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