From 1acddf19bb8c39f5202d80af068b5ffd14797f4b Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Fri, 17 Jul 2015 11:57:51 -0400
Subject: Initial commit

---
 src/rtl/modexps6_adder64_carry32.v | 70 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/rtl/modexps6_adder64_carry32.v

(limited to 'src/rtl/modexps6_adder64_carry32.v')

diff --git a/src/rtl/modexps6_adder64_carry32.v b/src/rtl/modexps6_adder64_carry32.v
new file mode 100644
index 0000000..87869d1
--- /dev/null
+++ b/src/rtl/modexps6_adder64_carry32.v
@@ -0,0 +1,70 @@
+`timescale 1ns / 1ps
+
+module modexps6_adder64_carry32
+	(
+		clk, t, x, y, s, c_in, c_out
+	);
+	
+	
+		//
+		// Ports
+		//
+	input		wire				clk;
+	input		wire	[31: 0]	t;
+	input		wire	[31: 0]	x;
+	input		wire	[31: 0]	y;
+	output	wire	[31: 0]	s;
+	input		wire	[31: 0]	c_in;
+	output	wire	[31: 0]	c_out;
+	
+	
+		//
+		// Multiplier
+		//
+	wire	[63: 0]	multiplier_out;
+	
+	multiplier_s6 dsp_multiplier
+	(
+		.clk	(clk),
+		.a		(x),
+		.b		(y),
+		.p		(multiplier_out)
+	);
+	
+	
+		//
+		// Carry and T
+		//
+	wire	[63: 0]	t_ext = {{32{1'b0}}, t};
+	wire	[63: 0]	c_ext = {{32{1'b0}}, c_in};
+	
+	
+		//
+		// Sum
+		//
+	wire	[63: 0]	sum = multiplier_out + c_in + t;
+		
+		
+		//
+		// Output
+		//
+	assign s = sum[31: 0];
+	assign c_out = sum[63:32];
+		
+	/*
+	reg	[31: 0]	s_reg;
+	reg	[31: 0]	c_out_reg;
+	
+	assign s = s_reg;
+	assign c_out = c_out_reg;
+	
+	always @(posedge clk) begin
+		//
+		s_reg			<= sum[31: 0];
+		c_out_reg	<= sum[63:32];
+		//
+	end
+	*/
+	
+	
+endmodule
-- 
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