YM2203 ready

Author: jotego

jt49

@@ -0,0 +1,84 @@
+/* This file is part of JT12.
+
+ 
+    JT12 program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    JT12 program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with JT12.  If not, see <http://www.gnu.org/licenses/>.
+
+    Author: Jose Tejada Gomez. Twitter: @topapate
+    Version: 1.0
+    Date: 27-1-2017 
+    
+    Each channel can use the full range of the DAC as they do not
+    get summed in the real chip.
+
+    Operator data is summed up without adding extra bits. This is
+    the case of real YM3438, which was used on Megadrive 2 models.
+
+
+*/
+
+
+
+module top(
+    input           rst,        // rst should be at least 6 clk&cen cycles long
+    input           clk,        // CPU clock
+    input           cen,        // optional clock enable, it not needed leave as 1'b1
+    input   [7:0]   din,
+    input   [1:0]   addr,
+    input           cs_n,
+    input           wr_n,
+    input           limiter_en,
+    
+    output  [7:0]   dout,
+    output          irq_n,
+    // combined output
+    output  signed  [15:0]  snd_right,
+    output  signed  [15:0]  snd_left,
+    output          snd_sample,
+    // multiplexed output
+    output signed   [8:0]   mux_right,  
+    output signed   [8:0]   mux_left,
+    output          mux_sample
+);
+
+`ifdef YM2203
+localparam use_lfo=0, use_ssg=1, num_ch=3, use_pcm=0, use_lr=0;
+`else // YM2612
+localparam use_lfo=1, use_ssg=0, num_ch=6, use_pcm=1, use_lr=1;
+`endif
+
+
+jt12 #(.use_lfo(use_lfo),.use_ssg(use_ssg), 
+    .num_ch(num_ch), .use_pcm(use_pcm), .use_lr(use_lr) ) 
+u_jt12(
+    .rst            ( rst       ),        // rst should be at least 6 clk&cen cycles long
+    .clk            ( clk       ),        // CPU clock
+    .cen            ( cen       ),        // optional clock enable, it not needed leave as 1'b1
+    .din            ( din       ),
+    .addr           ( addr      ),
+    .cs_n           ( cs_n      ),
+    .wr_n           ( wr_n      ),
+    .limiter_en     ( limiter_en),
+    
+    .dout           ( dout      ),
+    .irq_n          ( irq_n     ),
+
+    .snd_right      ( snd_right     ),
+    .snd_left       ( snd_left      ),
+    .snd_sample     ( snd_sample    ),
+    .mux_right      ( mux_right     ),  
+    .mux_left       ( mux_left      ),
+    .mux_sample     ( mux_sample    )
+);
+
+endmodule // jt03