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/*

 PSS

 Copyright (c) 2016 Alexander Antonov <153287@niuitmo.ru>

 All rights reserved.

 Version 0.9.0

 The FreeBSD license

 Redistribution and use in source and binary forms, with or without

 modification, are permitted provided that the following conditions

 are met:

 1. Redistributions of source code must retain the above copyright

    notice, this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above

    copyright notice, this list of conditions and the following

    disclaimer in the documentation and/or other materials

    provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY

 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 PSS PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

module ZPU_uC

#(

        parameter CPU_PRESENT = 1,

        parameter CPU_RESET_DEFAULT = 1,

        parameter A31_DEFAULT = 1,

        parameter MEM_DATA = "data.bin",

        parameter MEM_SIZE_KB = 1

)

(

        input  clk_i,

        input  arst_i,

        output srst_o,

        input  srst_i,

        output ext_rst_o,

        input [3:0] INT_bi,

        // Expansion bus

        output xport_req_o,

        input  xport_ack_i,

        input  xport_err_i,

        output xport_we_o,

        output [31:0] xport_addr_bo,

        output [31:0] xport_wdata_bo,

        input  xport_resp_i,

        input  [31:0] xport_rdata_bi,

        //Debug interface

        input  dbg_enb_i,

        input  dbg_wr_i,

        input  [31:0] dbg_addr_bi,

        input  [31:0] dbg_data_bi,

        output dbg_resp_o,

        output [31:0] dbg_data_bo

);

wire app_reset;

assign app_reset = srst_i | srst_o;

// CPU system bus

wire            cpu_bus_enb;

wire            cpu_bus_we;

wire            cpu_bus_ack;

wire [31:0] cpu_bus_read;

wire [31:0] cpu_bus_write;

wire [31:0] cpu_bus_addr;

wire [3:0]  cpu_bus_writemask;

// MAU-RAM bus

wire [31:0] ram0_bus_addr;

wire            ram0_bus_we;

wire [31:0] ram0_bus_rddata;

wire [31:0] ram0_bus_wrdata;

wire [31:0] ram1_bus_addr;

wire            ram1_bus_we;

wire [31:0] ram1_bus_rddata;

wire [31:0] ram1_bus_wrdata;

// CPU control

wire cpu_present;

wire [63:0] zpu_status;

wire cpu_break;

wire [31:0] cpu_pc;

wire            cpu_interrupt;

wire            cpu_interrupt_ack;

wire            cpu_reset;

wire            cpu_enb;

generate

        if (CPU_PRESENT == 1)

// Processor core

zpu_core

#(

        .stack_address((MEM_SIZE_KB * 1024) - 8)

)

zpu_core

(

        .clk(clk_i),

        .sreset(app_reset | cpu_reset),

        .enable(cpu_enb),

        .cpu_present(cpu_present),

        .pc_bo(cpu_pc),

        .mem_req(cpu_bus_enb),

        .mem_we(cpu_bus_we),

        .mem_ack(cpu_bus_ack),

        .mem_read(cpu_bus_read),

        .mem_write(cpu_bus_write),

        .out_mem_addr(cpu_bus_addr),

        .mem_writeMask(cpu_bus_writemask),

        .interrupt(cpu_interrupt),

        .interrupt_ack(cpu_interrupt_ack),

        .break_o(cpu_break),

        .zpu_status(zpu_status)

);

        else

zpu_core_stub zpu_core

(

        .clk(clk_i),

        .sreset(app_reset | cpu_reset),

        .enable(cpu_enb),

        .cpu_present(cpu_present),

        .pc_bo(cpu_pc),

        .mem_req(cpu_bus_enb),

        .mem_we(cpu_bus_we),

        .mem_ack(cpu_bus_ack),

        .mem_read(cpu_bus_read),

        .mem_write(cpu_bus_write),

        .out_mem_addr(cpu_bus_addr),

        .mem_writeMask(cpu_bus_writemask),

        .interrupt(cpu_interrupt),

        .interrupt_ack(cpu_interrupt_ack),

        .break_o(cpu_break),

        .zpu_status(zpu_status)

);

endgenerate

PSS_MotherBlock

#(

        .A31_DEFAULT(A31_DEFAULT),

        .CPU_RESET_DEFAULT(CPU_RESET_DEFAULT),

        .MEM_SIZE_KB(MEM_SIZE_KB)

)

MotherBlock

(

        .clk_i(clk_i),

        .arst_i(arst_i),

        .srst_o(srst_o),

        .srst_i(srst_i),

        .ext_rst_o(ext_rst_o),

        .INT_bi(INT_bi),

        .cpu_ireq_o(cpu_interrupt),

        .cpu_iack_i(cpu_interrupt_ack),

        //// Masters ////

        // Debug bus //

        .dbg_enb_i(dbg_enb_i),

        .dbg_we_i(dbg_wr_i),

        .dbg_addr_bi(dbg_addr_bi),

        .dbg_wdata_bi(dbg_data_bi),

        .dbg_ack_o(dbg_resp_o),

        .dbg_rdata_bo(dbg_data_bo),

        // ZPU bus //

        .cpu_enb_i(cpu_bus_enb),

        .cpu_we_i(cpu_bus_we),

        .cpu_ack_o(cpu_bus_ack),

        .cpu_rdata_bo(cpu_bus_read),

        .cpu_wdata_bi(cpu_bus_write),

        .cpu_addr_bi(cpu_bus_addr),

        .cpu_writemask_bi(cpu_bus_writemask),

        //// Slaves ////

        // RAM0 bus //

        .ram0_addr_bo(ram0_bus_addr),

        .ram0_we_o(ram0_bus_we),

        .ram0_wdata_bo(ram0_bus_wrdata),

        .ram0_rdata_bi(ram0_bus_rddata),

        // RAM1 bus //

        .ram1_addr_bo(ram1_bus_addr),

        .ram1_we_o(ram1_bus_we),

        .ram1_wdata_bo(ram1_bus_wrdata),

        .ram1_rdata_bi(ram1_bus_rddata),

        // Expansion port //

        .xport_req_o(xport_req_o),

        .xport_ack_i(xport_ack_i),

        .xport_err_i(xport_err_i),

        .xport_we_o(xport_we_o),

        .xport_addr_bo(xport_addr_bo),

        .xport_wdata_bo(xport_wdata_bo),

        .xport_resp_i(xport_resp_i),

        .xport_rdata_bi(xport_rdata_bi),

        .cpu_present_i(cpu_present),

        .cpu_pc_bi(cpu_pc),

        .cpu_break_i(cpu_break),

        .cpu_reset_o(cpu_reset),

        .cpu_enb_o(cpu_enb)

);

ram_dual

#(

        .mem_data(MEM_DATA),

        .dat_width(32),

        .adr_width(32),

        .mem_size((MEM_SIZE_KB * 1024) / 4 )

)

ram_dual_port

(

        .clk(clk_i),

        .dat0_i(ram0_bus_wrdata),

    .adr0_i({2'h0, ram0_bus_addr[31:2]}),

    .we0_i(ram0_bus_we),

    .dat0_o(ram0_bus_rddata),

    .dat1_i(ram1_bus_wrdata),

    .adr1_i({2'h0, ram1_bus_addr[31:2]}),

    .we1_i(ram1_bus_we),

    .dat1_o(ram1_bus_rddata)

);

endmodule