1 files changed, 66 insertions, 0 deletions
diff --git a/1-c.v b/1-c.v
new file mode 100644
index 0000000..c19bd93
--- /dev/null
+++ b/1-c.v
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+module au(x_int, y_int, x_frac, y_frac, operation, zero, overflow, result_int, result_frac);
+	parameter WIDTH_1 = 4, WIDTH_2 = 4;
+	input [WIDTH_1-1:0] x_int, y_int;
+	input [WIDTH_2-1:0] x_frac, y_frac;
+	input operation;
+	output zero, overflow;
+	output [WIDTH_1-1:0] result_int;
+	output [WIDTH_2-1:0] result_frac;
+	reg z, over;
+	reg [2*(WIDTH_1)-1:0] r_i;
+	reg [2*(WIDTH_2)-1:0] r_f;
+	reg [2*(WIDTH_1+WIDTH_2)-1:0] r_intr;
+	always @* begin
+		r_i = 0;
+		r_f = 0;
+		if (operation == 1'b0) begin
+			r_i = x_int + y_int;
+			r_f = x_frac + y_frac;
+			if (r_f[WIDTH_2] == 1'b1) r_i += 1;
+			if (r_i[WIDTH_1] == 1'b1) over = 1'b1;
+			else over = 1'b0;
+		end 
+		else begin
+			r_intr = {x_int, x_frac} * {y_int, y_frac};
+			r_i[WIDTH_1-1:0] = r_intr[2*WIDTH_2+WIDTH_1-1:2*WIDTH_2];
+			r_f[WIDTH_2-1:0] = r_intr[2*WIDTH_2-1:WIDTH_2];
+			if (r_intr[2*(WIDTH_2+WIDTH_1)-1:2*WIDTH_2+WIDTH_1] != 0/* || r_intr[WIDTH_2-1:0] != 0*/) 
+				over = 1'b1;
+			else 
+				over = 1'b0;
+		end
+		if (r_i[WIDTH_1-1:0] == 0 && r_f[WIDTH_2-1:0] == 0) z = 1;
+		else z = 0;
+		// z = (r_i == 0 && r_f == 0);
+	end
+
+	assign result_int = r_i[WIDTH_1-1:0];
+	assign result_frac = r_f[WIDTH_2-1:0];
+	assign zero = z;
+	assign overflow = over;
+endmodule
+
+/*
+module test;
+	reg [3:0] a, b;
+	reg [3:0] _a, _b;
+	reg switch; 
+
+	wire [3:0] r;
+	wire [3:0] _r;
+	wire zero, overflow;
+
+	au summer(a, b, _a, _b, switch, zero, overflow, r, _r);
+	
+	initial begin;
+		a = 0;
+		_a = 4'b1100;
+		b = 0;
+		_b = 4'b1100;
+		switch = 1'b0;
+		#1;
+		$display("%d.%b %s %d.%b = %d.%b (overflow: %b, zero: %b)", 
+			a, _a, (switch == 1'b0 ? "+" : "*"), b, _b, r, _r, overflow, zero);
+	end
+endmodule
+*/