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Diffstat (limited to 'sn76489-1.0/sn76489_top.vhd')
| -rw-r--r-- | sn76489-1.0/sn76489_top.vhd | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/sn76489-1.0/sn76489_top.vhd b/sn76489-1.0/sn76489_top.vhd new file mode 100644 index 0000000..d08fc14 --- /dev/null +++ b/sn76489-1.0/sn76489_top.vhd @@ -0,0 +1,202 @@ +------------------------------------------------------------------------------- +-- +-- Synthesizable model of TI's SN76489AN. +-- +-- $Id: sn76489_top.vhd,v 1.9 2006/02/27 20:30:10 arnim Exp $ +-- +-- Chip Toplevel +-- +-- References: +-- +-- * TI Data sheet SN76489.pdf +-- ftp://ftp.whtech.com/datasheets%20&%20manuals/SN76489.pdf +-- +-- * John Kortink's article on the SN76489: +-- http://web.inter.nl.net/users/J.Kortink/home/articles/sn76489/ +-- +-- * Maxim's "SN76489 notes" in +-- http://www.smspower.org/maxim/docs/SN76489.txt +-- +------------------------------------------------------------------------------- +-- +-- Copyright (c) 2005, 2006, Arnim Laeuger (arnim.laeuger@gmx.net) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +------------------------------------------------------------------------------- + +library ieee; +use ieee.std_logic_1164.all; +use ieee.numeric_std.all; + +entity sn76489_top is + + generic ( + clock_div_16_g : integer := 1 + ); + port ( + clock_i : in std_logic; + clock_en_i : in std_logic; + res_n_i : in std_logic; + ce_n_i : in std_logic; + we_n_i : in std_logic; + ready_o : out std_logic; + d_i : in std_logic_vector(0 to 7); + aout_o : out signed(0 to 7) + ); + +end sn76489_top; + + +library ieee; +use ieee.numeric_std.all; +use work.sn76489_comp_pack.all; + +architecture struct of sn76489_top is + + signal clk_en_s : boolean; + + signal tone1_we_s, + tone2_we_s, + tone3_we_s, + noise_we_s : boolean; + signal r2_s : std_logic; + + signal tone1_s, + tone2_s, + tone3_s, + noise_s : signed(0 to 7); + + signal tone3_ff_s : std_logic; + +begin + + ----------------------------------------------------------------------------- + -- Clock Divider + ----------------------------------------------------------------------------- + clock_div_b : sn76489_clock_div + generic map ( + clock_div_16_g => clock_div_16_g + ) + port map ( + clock_i => clock_i, + clock_en_i => clock_en_i, + res_n_i => res_n_i, + clk_en_o => clk_en_s + ); + + + ----------------------------------------------------------------------------- + -- Latch Control = CPU Interface + ----------------------------------------------------------------------------- + latch_ctrl_b : sn76489_latch_ctrl + port map ( + clock_i => clock_i, + clk_en_i => clk_en_s, + res_n_i => res_n_i, + ce_n_i => ce_n_i, + we_n_i => we_n_i, + d_i => d_i, + ready_o => ready_o, + tone1_we_o => tone1_we_s, + tone2_we_o => tone2_we_s, + tone3_we_o => tone3_we_s, + noise_we_o => noise_we_s, + r2_o => r2_s + ); + + + ----------------------------------------------------------------------------- + -- Tone Channel 1 + ----------------------------------------------------------------------------- + tone1_b : sn76489_tone + port map ( + clock_i => clock_i, + clk_en_i => clk_en_s, + res_n_i => res_n_i, + we_i => tone1_we_s, + d_i => d_i, + r2_i => r2_s, + ff_o => open, + tone_o => tone1_s + ); + + ----------------------------------------------------------------------------- + -- Tone Channel 2 + ----------------------------------------------------------------------------- + tone2_b : sn76489_tone + port map ( + clock_i => clock_i, + clk_en_i => clk_en_s, + res_n_i => res_n_i, + we_i => tone2_we_s, + d_i => d_i, + r2_i => r2_s, + ff_o => open, + tone_o => tone2_s + ); + + ----------------------------------------------------------------------------- + -- Tone Channel 3 + ----------------------------------------------------------------------------- + tone3_b : sn76489_tone + port map ( + clock_i => clock_i, + clk_en_i => clk_en_s, + res_n_i => res_n_i, + we_i => tone3_we_s, + d_i => d_i, + r2_i => r2_s, + ff_o => tone3_ff_s, + tone_o => tone3_s + ); + + ----------------------------------------------------------------------------- + -- Noise Channel + ----------------------------------------------------------------------------- + noise_b : sn76489_noise + port map ( + clock_i => clock_i, + clk_en_i => clk_en_s, + res_n_i => res_n_i, + we_i => noise_we_s, + d_i => d_i, + r2_i => r2_s, + tone3_ff_i => tone3_ff_s, + noise_o => noise_s + ); + + + aout_o <= tone1_s + tone2_s + tone3_s + noise_s; + +end struct; |