Subversion Repositories wb_lcd

//////////////////////////////////////////////////////////////////////

////                                                              ////

////  wb_lcd.v                                                    ////

////                                                              ////

////  This file is part of:                                       ////

////  WISHBONE/MEM MAPPED CONTROLLER FOR LCD CHARACTER DISPLAYS   ////

////  http://www.opencores.org/projects/wb_lcd/                   ////

////                                                              ////

////  Description                                                 ////

////   -  Wishbone wrapper.                                       ////

////                                                              ////

////  To Do:                                                      ////

////   - nothing really                                           ////

////                                                              ////

////  Author(s):                                                  ////

////   - José Ignacio Villar, jose@dte.us.es , jvillar@gmail.com  ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2009 José Ignacio Villar - jvillar@gmail.com   ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file 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 3 of the License, or (at your option) any     ////

//// later version.                                               ////

////                                                              ////

//// This source 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 Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.gnu.org/licenses/lgpl.txt                    ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

`include "lcd_defines.v"

module wb_lcd (

        //

        // I/O Ports

        //

        input                   wb_clk_i,

        input                   wb_rst_i,

        //

        // WB slave interface

        //

        input   [`WB_DAT_RNG]   wb_dat_i,

        output  [`WB_DAT_RNG]   wb_dat_o,

        input   [`WB_ADDR_RNG]  wb_adr_i,

        input   [`WB_BSEL_RNG]  wb_sel_i,

        input                   wb_we_i,

        input                   wb_cyc_i,

        input                   wb_stb_i,

        output                  wb_ack_o,

        //

        // LCD interface

        //

        output  [3:0]            SF_D,

        output                  LCD_E,

        output                  LCD_RS,

        output                  LCD_RW

        );

wire lcd_busy;

wire lcd_we;

assign wb_ack_o = wb_cyc_i & wb_stb_i;

assign lcd_we   = wb_cyc_i & wb_stb_i & wb_we_i & (wb_adr_i != 128);

assign wb_dat_o = lcd_busy ? `STATUS_BUSY_CODE : `STATUS_IDDLE_CODE;

//----------------------------------------------------------------------------

// Memory mapped LCD display controller

//----------------------------------------------------------------------------

lcd lcd(

        .clk    ( wb_clk_i ),

        .reset  ( wb_rst_i ),

        .dat    ( wb_dat_i[`DAT_RNG] ),

        .addr   ( wb_adr_i[`ADDR_WIDTH-1:0] ),

        .we     ( lcd_we ),

        .busy   ( lcd_busy ),

        .SF_D   ( SF_D ),

        .LCD_E  ( LCD_E ),

        .LCD_RS ( LCD_RS ),

        .LCD_RW ( LCD_RW )

        );

endmodule