From 8090886ab032f5c80714e5cb29a19b5e5abac841 Mon Sep 17 00:00:00 2001
From: Joris van Rantwijk <joris@jorisvr.nl>
Date: Thu, 24 Mar 2016 23:34:20 +0100
Subject: [PATCH] VHDL wrapper for sin/cos function with 18-bit sin/cos, 20-bit
 phase.

---
 rtl/sincos_gen_d18_p20.vhdl | 61 +++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 rtl/sincos_gen_d18_p20.vhdl

diff --git a/rtl/sincos_gen_d18_p20.vhdl b/rtl/sincos_gen_d18_p20.vhdl
new file mode 100644
index 0000000..8feba07
--- /dev/null
+++ b/rtl/sincos_gen_d18_p20.vhdl
@@ -0,0 +1,61 @@
+--
+--  Sine / cosine function core
+--
+--  Phase input:
+--    unsigned 20 bits (2**20 steps for a full circle)
+--
+--  Sin/cos output:
+--    signed 18 bits (nominal amplitude = 2**17-1)
+--
+--  Copyright 2016 Joris van Rantwijk
+--
+--  This design is free software; you can redistribute it and/or
+--  modify it under the terms of the GNU Lesser General Public
+--  License as published by the Free Software Foundation; either
+--  version 2.1 of the License, or (at your option) any later version.
+--
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity sincos_gen_d18_p20 is
+
+    port (
+        -- System clock, active on rising edge.
+        clk:        in  std_logic;
+
+        -- Clock enable.
+        clk_en:     in  std_logic;
+
+        -- Phase input.
+        in_phase:   in  unsigned(19 downto 0);
+
+        -- Sine output.
+        -- (6 clock cycles latency after in_phase).
+        out_sin:    out signed(17 downto 0);
+
+        -- Cosine output.
+        -- (6 clock cycles latency after in_phase).
+        out_cos:    out signed(17 downto 0) );
+
+end entity;
+
+architecture rtl of sincos_gen_d18_p20 is
+
+begin
+
+    gen0: entity work.sincos_gen
+        generic map (
+            data_bits       => 18,
+            phase_bits      => 20,
+            table_addrbits  => 10,
+            taylor_order    => 1 )
+        port map (
+            clk             => clk,
+            clk_en          => clk_en,
+            in_phase        => in_phase,
+            out_sin         => out_sin,
+            out_cos         => out_cos );
+
+end architecture;