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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

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

module top

(

    // Clocking & Reset

    input clk_i,

    input rst_i,

    // Fault Output

    output fault_o,

    // Break Output 

    output break_o,

    // Interrupt Input

    input intr_i

);

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

// Params

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

parameter           CLK_KHZ              = 8192;

parameter           BOOT_VECTOR          = 32'h10000000;

parameter           ISR_VECTOR           = 32'h10000000;

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

// Registers / Wires

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

wire [31:0]         soc_addr;

wire [31:0]         soc_data_w;

wire [31:0]         soc_data_r;

wire [3:0]          soc_wr;

wire                soc_rd;

wire                soc_irq;

wire[31:0]          dmem_address;

wire[31:0]          dmem_data_w;

wire[31:0]          dmem_data_r;

wire[3:0]           dmem_wr;

wire                dmem_rd;

wire                dmem_burst;

wire                dmem_ack;

reg                 dmem_req_r;

wire[31:0]          imem_addr;

wire[31:0]          imem_data;

wire                imem_rd;

wire                imem_burst;

wire                imem_ack;

reg                 imem_req_r;

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

// Instantiation

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

// BlockRAM

ram

#(

    .block_count(128) // 1MB

)

u_ram

(

    .clka_i(clk_i),

    .ena_i(1'b1),

    .wea_i(4'b0),

    .addra_i(imem_addr[31:2]),

    .dataa_i(32'b0),

    .dataa_o(imem_data),

    .clkb_i(clk_i),

    .enb_i(1'b1),

    .web_i(dmem_wr),

    .addrb_i(dmem_address[31:2]),

    .datab_i(dmem_data_w),

    .datab_o(dmem_data_r)

);

// CPU

cpu_if

#(

    .CLK_KHZ(CLK_KHZ),

    .BOOT_VECTOR(32'h10000000),

    .ISR_VECTOR(32'h10000000),

    .ENABLE_ICACHE("ENABLED"),

    .ENABLE_DCACHE("ENABLED"),

    .REGISTER_FILE_TYPE("SIMULATION")

)

u_cpu

(

    // General - clocking & reset

    .clk_i(clk_i),

    .rst_i(rst_i),

    .fault_o(fault_o),

    .break_o(break_o),

    .nmi_i(1'b0),

    .intr_i(soc_irq),

    // Instruction Memory 0 (0x10000000 - 0x10FFFFFF)

    .imem0_addr_o(imem_addr),

    .imem0_rd_o(imem_rd),

    .imem0_burst_o(imem_burst),

    .imem0_data_in_i(imem_data),

    .imem0_accept_i(1'b1),

    .imem0_ack_i(imem_ack),

    // Data Memory 0 (0x10000000 - 0x10FFFFFF)

    .dmem0_addr_o(dmem_address),

    .dmem0_data_o(dmem_data_w),

    .dmem0_data_i(dmem_data_r),

    .dmem0_wr_o(dmem_wr),

    .dmem0_rd_o(dmem_rd),

    .dmem0_accept_i(1'b1),

    .dmem0_burst_o(dmem_burst),

    .dmem0_ack_i(dmem_ack),

    // Data Memory 1 (0x11000000 - 0x11FFFFFF)

    .dmem1_addr_o(),

    .dmem1_data_o(),

    .dmem1_data_i(32'b0),

    .dmem1_wr_o(),

    .dmem1_rd_o(),

    .dmem1_accept_i(1'b1),

    .dmem1_burst_o(/*open*/),

    .dmem1_ack_i(1'b1),

    // Data Memory 2 (0x12000000 - 0x12FFFFFF)

    .dmem2_addr_o(soc_addr),

    .dmem2_data_o(soc_data_w),

    .dmem2_data_i(soc_data_r),

    .dmem2_wr_o(soc_wr),

    .dmem2_rd_o(soc_rd),

    .dmem2_accept_i(1'b1),

    .dmem2_burst_o(/*open*/),

    .dmem2_ack_i(1'b1)

);

// CPU SOC

soc

#(

    .CLK_KHZ(CLK_KHZ),

    .ENABLE_SYSTICK_TIMER("ENABLED"),

    .ENABLE_HIGHRES_TIMER("ENABLED"),

    .EXTERNAL_INTERRUPTS(1)

)

u_soc

(

    // General - clocking & reset

    .clk_i(clk_i),

    .rst_i(rst_i),

    .ext_intr_i(1'b0),

    .intr_o(soc_irq),

    // Memory Port

    .io_addr_i(soc_addr),

    .io_data_i(soc_data_w),

    .io_data_o(soc_data_r),

    .io_wr_i(soc_wr),

    .io_rd_i(soc_rd)

);

// Ack

always @(posedge clk_i or posedge rst_i)

begin

    if (rst_i == 1'b1)

    begin

        imem_req_r  <= 1'b0;

    end

    else

    begin

        imem_req_r  <= imem_rd;

    end

end

assign imem_ack = imem_req_r;

// Ack

always @(posedge clk_i or posedge rst_i)

begin

    if (rst_i == 1'b1)

    begin

        dmem_req_r  <= 1'b0;

    end

    else

    begin

        dmem_req_r  <= dmem_rd | (|dmem_wr);

    end

end

assign dmem_ack = dmem_req_r;

endmodule