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

//                           AltOR32 

//                Alternative Lightweight OpenRisc 

//                            V2.0

//                     Ultra-Embedded.com

//                   Copyright 2011 - 2013

//

//               Email: admin@ultra-embedded.com

//

//                       License: LGPL

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

//

// Copyright (C) 2011 - 2013 Ultra-Embedded.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 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, write to the 

// Free Software Foundation, Inc., 59 Temple Place, Suite 330, 

// Boston, MA  02111-1307  USA

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

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

// Module: ram_dp8 - dual port block RAM

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

module ram_dp8

(

    aclk_i,

    aadr_i,

    adat_i,

    awr_i,

    adat_o,

    bclk_i,

    badr_i,

    bdat_i,

    bwr_i,

    bdat_o

);

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

// Params

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

parameter  [31:0]       WIDTH       = 8;

parameter  [31:0]       SIZE        = 14;

parameter               FILENAME    = "mem.hex";

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

// I/O

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

input                   aclk_i /*verilator public*/;

output [(WIDTH - 1):0]  adat_o /*verilator public*/;

input [(WIDTH - 1):0]   adat_i /*verilator public*/;

input [(SIZE - 1):0]    aadr_i /*verilator public*/;

input                   awr_i /*verilator public*/;

input                   bclk_i /*verilator public*/;

output [(WIDTH - 1):0]  bdat_o /*verilator public*/;

input [(WIDTH - 1):0]   bdat_i /*verilator public*/;

input [(SIZE - 1):0]    badr_i /*verilator public*/;

input                   bwr_i /*verilator public*/;

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

// Registers

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

/* verilator lint_off MULTIDRIVEN */

reg [(WIDTH - 1):0]     ram [((2<< (SIZE-1)) - 1):0] /*verilator public*/;

/* verilator lint_on MULTIDRIVEN */

reg [(SIZE - 1):0]      rd_addr_a;

reg [(SIZE - 1):0]      rd_addr_b;

wire [(WIDTH - 1):0]    adat_o;

wire [(WIDTH - 1):0]    bdat_o;

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

// Processes

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

always @ (posedge aclk_i)

begin

    if (awr_i == 1'b1)

        ram[aadr_i] <= adat_i;

    rd_addr_a <= aadr_i;

end

always @ (posedge bclk_i)

begin

    if (bwr_i == 1'b1)

        ram[badr_i] <= bdat_i;

    rd_addr_b <= badr_i;

end

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

// Combinatorial

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

assign adat_o = ram[rd_addr_a];

assign bdat_o = ram[rd_addr_b];

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

// Load memory image

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

integer i;

initial

begin

    for (i=0;i<((2<< (SIZE-1)) - 1);i=i+1)

    begin

        ram[i] = 0;

    end

    $readmemh(FILENAME, ram);

end

endmodule