From caea5e361940c0d445a7d90446641a637c6d49cc Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov (Meister)" <meisterpaul1@yandex.ru>
Date: Sat, 1 Jul 2017 22:26:32 +0300
Subject: Started porting generic multiplier to Xilinx primitives.

---
 src/rtl/pe/artix7/multiplier32_artix7.v | 83 +++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 src/rtl/pe/artix7/multiplier32_artix7.v

(limited to 'src/rtl/pe/artix7/multiplier32_artix7.v')

diff --git a/src/rtl/pe/artix7/multiplier32_artix7.v b/src/rtl/pe/artix7/multiplier32_artix7.v
new file mode 100644
index 0000000..5cc6340
--- /dev/null
+++ b/src/rtl/pe/artix7/multiplier32_artix7.v
@@ -0,0 +1,83 @@
+`timescale 1ns / 1ps
+
+module multiplier32_artix7
+	(
+		input					clk,
+		input		[31: 0]	a,
+		input		[31: 0]	b,
+		input		[31: 0]	t,
+		input		[31: 0]	c_in,
+		output	[31: 0]	p,
+		output	[31: 0]	c_out
+	);
+	
+	reg	[31: 0]	t_dly;
+	reg	[31: 0]	c_in_dly;
+	
+	always @(posedge clk) t_dly <= t;
+	always @(posedge clk) c_in_dly <= c_in;
+	
+	wire	[31: 0]	t_c_in_s;
+	wire				t_c_in_c_out;
+	
+	reg				t_c_in_c_out_dly;
+	
+	always @(posedge clk) t_c_in_c_out_dly <= t_c_in_c_out;
+	
+	adder32_artix7 add_t_c_in
+	(
+		.clk		(clk),
+		.a			(t_dly),
+		.b			(c_in_dly),
+		.c_in		(1'b0),
+		.s			(t_c_in_s),
+		.c_out	(t_c_in_c_out)
+	);
+
+	wire	[63: 0]	a_b;
+	
+	wire	[31: 0]	a_b_lsb = a_b[31: 0];
+	wire	[31: 0]	a_b_msb = a_b[63:32];
+	
+	reg	[31: 0]	a_b_msb_dly;
+	
+	always @(posedge clk) a_b_msb_dly <= a_b_msb;
+	
+	ip_mul32 mul_a_b
+	(
+		.clk	(clk),
+		.a		(a),
+		.b		(b),
+		.p		(a_b)
+	);
+	
+	wire	[31: 0]	add_p_s;
+	wire				add_p_c_out;
+	
+	reg	[31: 0]	add_p_s_dly;
+	
+	always @(posedge clk) add_p_s_dly <= add_p_s;
+	
+	assign p = add_p_s_dly;
+	
+	adder32_artix7 add_p
+	(
+		.clk		(clk),
+		.a			(a_b_lsb),
+		.b			(t_c_in_s),
+		.c_in		(1'b0),
+		.s			(add_p_s),
+		.c_out	(add_p_c_out)
+	);
+
+	adder32_artix7 add_c_out
+	(
+		.clk		(clk),
+		.a			(a_b_msb_dly),
+		.b			({{31{1'b0}}, t_c_in_c_out_dly}),
+		.c_in		(add_p_c_out),
+		.s			(c_out),
+		.c_out	()
+	);
+
+endmodule
-- 
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