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

////                                                              ////

////  ps2_translation_table.v                                     ////

////                                                              ////

////  This file is part of the "ps2" project                      ////

////  http://www.opencores.org/cores/ps2/                         ////

////                                                              ////

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

////      - mihad@opencores.org                                   ////

////      - Miha Dolenc                                           ////

////                                                              ////

////  All additional information is avaliable in the README.txt   ////

////  file.                                                       ////

////                                                              ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2000 Miha Dolenc, mihad@opencores.org          ////

////                                                              ////

//// 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 2.1 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.opencores.org/lgpl.shtml                     ////

////                                                              ////

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

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.1.1.1  2002/02/18 16:16:56  mihad

// Initial project import - working

//

//

`include "ps2_defines.v"

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

module ps2_translation_table

(

    reset_i,

    clock_i,

    translate_i,

    code_i,

    code_o,

    address_i,

    data_i,

    we_i,

    re_i,

    data_o,

    rx_data_ready_i,

    rx_translated_data_ready_o,

    rx_read_i,

    rx_read_o,

    rx_released_i

) ;

input reset_i,

      clock_i,

      translate_i ;

input  [7:0] code_i ;

output [7:0] code_o ;

input  [7:0] address_i ;

input  [7:0] data_i ;

input        we_i,

             re_i ;

output [7:0] data_o ;

input rx_data_ready_i,

      rx_read_i ;

output rx_translated_data_ready_o ;

output rx_read_o ;

input  rx_released_i ;

wire translation_table_write_enable  = we_i && (!translate_i || !rx_data_ready_i) ;

wire [7:0] translation_table_address = ((we_i || re_i) && (!rx_data_ready_i || !translate_i)) ? address_i : code_i ;

wire translation_table_enable        = we_i || re_i || (translate_i && rx_data_ready_i) ;

reg rx_translated_data_ready ;

always@(posedge clock_i or posedge reset_i)

begin

    if ( reset_i )

        rx_translated_data_ready <= #1 1'b0 ;

    else if ( rx_read_i || !translate_i )

        rx_translated_data_ready <= #1 1'b0 ;

    else

        rx_translated_data_ready <= #1 rx_data_ready_i ;

end

`ifdef PS2_RAMB4

    `define PS2_RAM_SELECTED

    wire [7:0] ram_out ;

    RAMB4_S8 `ifdef SIM

             #("ignore",

               `PS2_TRANSLATION_TABLE_31_0,

               `PS2_TRANSLATION_TABLE_63_32,

               `PS2_TRANSLATION_TABLE_95_64,

               `PS2_TRANSLATION_TABLE_127_96,

               `PS2_TRANSLATION_TABLE_159_128,

               `PS2_TRANSLATION_TABLE_191_160,

               `PS2_TRANSLATION_TABLE_223_192,

               `PS2_TRANSLATION_TABLE_255_224)

              `endif

    ps2_ram

    (

        .DO   (ram_out),

        .ADDR ({1'b0, translation_table_address}),

        .DI   (data_i),

        .EN   (translation_table_enable),

        .CLK  (clock_i),

        .WE   (translation_table_write_enable),

        .RST  (reset_i)

    ) ;

`endif

`ifdef PS2_RAM_SELECTED

`else

    `define PS2_RAM_SELECTED

    reg [7:0] ps2_ram [0:255] ;

    reg [7:0] ram_out ;

    always@(posedge clock_i or posedge reset_i)

    begin

        if ( reset_i )

            ram_out <= #1 8'h0 ;

        else if ( translation_table_enable )

            ram_out <= #1 ps2_ram[translation_table_address] ;

    end

    always@(posedge clock_i)

    begin

        if ( translation_table_write_enable )

            ps2_ram[translation_table_address] <= #1 data_i ;

    end

    // synopsys translate_off

    integer i ;

    reg [255:0] temp_init_val ;

    initial

    begin

        temp_init_val = `PS2_TRANSLATION_TABLE_31_0 ;

        for ( i = 0 ; i <= 31 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_63_32 ;

        for ( i = 32 ; i <= 63 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_95_64 ;

        for ( i = 64 ; i <= 95 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_127_96 ;

        for ( i = 96 ; i <= 127 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_159_128 ;

        for ( i = 128 ; i <= 159 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_191_160 ;

        for ( i = 160 ; i <= 191 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_223_192 ;

        for ( i = 192 ; i <= 223 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

        temp_init_val = `PS2_TRANSLATION_TABLE_255_224 ;

        for ( i = 224 ; i <= 255 ; i = i + 1 )

        begin

            ps2_ram[i] = temp_init_val[7:0] ;

            temp_init_val = temp_init_val >> 8 ;

        end

    end

    // synopsys translate_on

`endif

assign data_o = ram_out ;

assign code_o = translate_i ? {(rx_released_i | ram_out[7]), ram_out[6:0]} : code_i ;

assign rx_translated_data_ready_o = translate_i ? rx_translated_data_ready : rx_data_ready_i ;

assign rx_read_o = rx_read_i ;

`undef PS2_RAM_SELECTED

endmodule //ps2_translation_table