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

// Copyright (C) 2001 Authors

//

// 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

//

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

// 

// *File Name: openMSP430_fpga.v

// 

// *Module Description:

//                      openMSP430 FPGA Top-level for the Diligent

//                     Spartan-3 starter kit.

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev: 155 $

// $LastChangedBy: olivier.girard $

// $LastChangedDate: 2012-10-15 23:35:05 +0200 (Mon, 15 Oct 2012) $

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

`include "openMSP430_defines.v"

module openMSP430_fpga (

// Clock Sources

    CLK_50MHz,

    CLK_SOCKET,

// Slide Switches

    SW7,

    SW6,

    SW5,

    SW4,

    SW3,

    SW2,

    SW1,

    SW0,

// Push Button Switches

    BTN3,

    BTN2,

    BTN1,

    BTN0,

// LEDs

    LED7,

    LED6,

    LED5,

    LED4,

    LED3,

    LED2,

    LED1,

    LED0,

// Four-Sigit, Seven-Segment LED Display

    SEG_A,

    SEG_B,

    SEG_C,

    SEG_D,

    SEG_E,

    SEG_F,

    SEG_G,

    SEG_DP,

    SEG_AN0,

    SEG_AN1,

    SEG_AN2,

    SEG_AN3,

// RS-232 Port

    UART_RXD,

    UART_TXD,

    UART_RXD_A,

    UART_TXD_A,

// PS/2 Mouse/Keyboard Port

    PS2_D,

    PS2_C,

// Fast, Asynchronous SRAM

    SRAM_A17,               // Address Bus Connections

    SRAM_A16,

    SRAM_A15,

    SRAM_A14,

    SRAM_A13,

    SRAM_A12,

    SRAM_A11,

    SRAM_A10,

    SRAM_A9,

    SRAM_A8,

    SRAM_A7,

    SRAM_A6,

    SRAM_A5,

    SRAM_A4,

    SRAM_A3,

    SRAM_A2,

    SRAM_A1,

    SRAM_A0,

    SRAM_OE,                // Write enable and output enable control signals

    SRAM_WE,

    SRAM0_IO15,             // SRAM Data signals, chip enables, and byte enables

    SRAM0_IO14,

    SRAM0_IO13,

    SRAM0_IO12,

    SRAM0_IO11,

    SRAM0_IO10,

    SRAM0_IO9,

    SRAM0_IO8,

    SRAM0_IO7,

    SRAM0_IO6,

    SRAM0_IO5,

    SRAM0_IO4,

    SRAM0_IO3,

    SRAM0_IO2,

    SRAM0_IO1,

    SRAM0_IO0,

    SRAM0_CE1,

    SRAM0_UB1,

    SRAM0_LB1,

    SRAM1_IO15,

    SRAM1_IO14,

    SRAM1_IO13,

    SRAM1_IO12,

    SRAM1_IO11,

    SRAM1_IO10,

    SRAM1_IO9,

    SRAM1_IO8,

    SRAM1_IO7,

    SRAM1_IO6,

    SRAM1_IO5,

    SRAM1_IO4,

    SRAM1_IO3,

    SRAM1_IO2,

    SRAM1_IO1,

    SRAM1_IO0,

    SRAM1_CE2,

    SRAM1_UB2,

    SRAM1_LB2,

// VGA Port

    VGA_R,

    VGA_G,

    VGA_B,

    VGA_HS,

    VGA_VS

);

// Clock Sources

input     CLK_50MHz;

input     CLK_SOCKET;

// Slide Switches

input     SW7;

input     SW6;

input     SW5;

input     SW4;

input     SW3;

input     SW2;

input     SW1;

input     SW0;

// Push Button Switches

input     BTN3;

input     BTN2;

input     BTN1;

input     BTN0;

// LEDs

output    LED7;

output    LED6;

output    LED5;

output    LED4;

output    LED3;

output    LED2;

output    LED1;

output    LED0;

// Four-Sigit, Seven-Segment LED Display

output    SEG_A;

output    SEG_B;

output    SEG_C;

output    SEG_D;

output    SEG_E;

output    SEG_F;

output    SEG_G;

output    SEG_DP;

output    SEG_AN0;

output    SEG_AN1;

output    SEG_AN2;

output    SEG_AN3;

// RS-232 Port

input     UART_RXD;

output    UART_TXD;

input     UART_RXD_A;

output    UART_TXD_A;

// PS/2 Mouse/Keyboard Port

inout     PS2_D;

output    PS2_C;

// Fast, Asynchronous SRAM

output    SRAM_A17;         // Address Bus Connections

output    SRAM_A16;

output    SRAM_A15;

output    SRAM_A14;

output    SRAM_A13;

output    SRAM_A12;

output    SRAM_A11;

output    SRAM_A10;

output    SRAM_A9;

output    SRAM_A8;

output    SRAM_A7;

output    SRAM_A6;

output    SRAM_A5;

output    SRAM_A4;

output    SRAM_A3;

output    SRAM_A2;

output    SRAM_A1;

output    SRAM_A0;

output    SRAM_OE;          // Write enable and output enable control signals

output    SRAM_WE;

inout     SRAM0_IO15;       // SRAM Data signals, chip enables, and byte enables

inout     SRAM0_IO14;

inout     SRAM0_IO13;

inout     SRAM0_IO12;

inout     SRAM0_IO11;

inout     SRAM0_IO10;

inout     SRAM0_IO9;

inout     SRAM0_IO8;

inout     SRAM0_IO7;

inout     SRAM0_IO6;

inout     SRAM0_IO5;

inout     SRAM0_IO4;

inout     SRAM0_IO3;

inout     SRAM0_IO2;

inout     SRAM0_IO1;

inout     SRAM0_IO0;

output    SRAM0_CE1;

output    SRAM0_UB1;

output    SRAM0_LB1;

inout     SRAM1_IO15;

inout     SRAM1_IO14;

inout     SRAM1_IO13;

inout     SRAM1_IO12;

inout     SRAM1_IO11;

inout     SRAM1_IO10;

inout     SRAM1_IO9;

inout     SRAM1_IO8;

inout     SRAM1_IO7;

inout     SRAM1_IO6;

inout     SRAM1_IO5;

inout     SRAM1_IO4;

inout     SRAM1_IO3;

inout     SRAM1_IO2;

inout     SRAM1_IO1;

inout     SRAM1_IO0;

output    SRAM1_CE2;

output    SRAM1_UB2;

output    SRAM1_LB2;

// VGA Port

output    VGA_R;

output    VGA_G;

output    VGA_B;

output    VGA_HS;

output    VGA_VS;

//=============================================================================

// 1)  INTERNAL WIRES/REGISTERS/PARAMETERS DECLARATION

//=============================================================================

// openMSP430 output buses

wire        [13:0] per_addr;

wire        [15:0] per_din;

wire         [1:0] per_we;

wire [`DMEM_MSB:0] dmem_addr;

wire        [15:0] dmem_din;

wire         [1:0] dmem_wen;

wire [`PMEM_MSB:0] pmem_addr;

wire        [15:0] pmem_din;

wire         [1:0] pmem_wen;

wire        [13:0] irq_acc;

// openMSP430 input buses

wire        [13:0] irq_bus;

wire        [15:0] per_dout;

wire        [15:0] dmem_dout;

wire        [15:0] pmem_dout;

// GPIO

wire         [7:0] p1_din;

wire         [7:0] p1_dout;

wire         [7:0] p1_dout_en;

wire         [7:0] p1_sel;

wire         [7:0] p2_din;

wire         [7:0] p2_dout;

wire         [7:0] p2_dout_en;

wire         [7:0] p2_sel;

wire         [7:0] p3_din;

wire         [7:0] p3_dout;

wire         [7:0] p3_dout_en;

wire         [7:0] p3_sel;

wire        [15:0] per_dout_dio;

// Timer A

wire        [15:0] per_dout_tA;

// 7 segment driver

wire        [15:0] per_dout_7seg;

// Simple UART

wire               irq_uart_rx;

wire               irq_uart_tx;

wire        [15:0] per_dout_uart;

wire               hw_uart_txd;

wire               hw_uart_rxd;

// Others

wire               reset_pin;

//=============================================================================

// 2)  CLOCK GENERATION

//=============================================================================

// Input buffers

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

IBUFG ibuf_clk_main   (.O(clk_50M_in),    .I(CLK_50MHz));

IBUFG ibuf_clk_socket (.O(clk_socket_in), .I(CLK_SOCKET));

// Digital Clock Manager

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

// Generate 20MHz clock from 50MHz on-board oscillator

//`define DCM_FX_MODE

`ifdef DCM_FX_MODE

DCM dcm_adv_clk_main (

// OUTPUTs

    .CLK0         (),

    .CLK90        (),

    .CLK180       (),

    .CLK270       (),

    .CLK2X        (),

    .CLK2X180     (),

    .CLKDV        (),

    .CLKFX        (dcm_clk),

    .CLKFX180     (),

    .PSDONE       (),

    .STATUS       (),

    .LOCKED       (dcm_locked),

// INPUTs

    .CLKIN        (clk_50M_in),

    .CLKFB        (1'b0),

    .PSINCDEC     (1'b0),

    .PSEN         (1'b0),

    .DSSEN        (1'b0),

    .RST          (reset_pin),

    .PSCLK        (1'b0)

);

// synopsys translate_off

defparam dcm_adv_clk_main.CLK_FEEDBACK          = "NONE";

defparam dcm_adv_clk_main.CLKDV_DIVIDE          = 2.5;

defparam dcm_adv_clk_main.CLKIN_DIVIDE_BY_2     = "FALSE";

defparam dcm_adv_clk_main.CLKIN_PERIOD          = 20.0;

defparam dcm_adv_clk_main.CLKOUT_PHASE_SHIFT    = "NONE";

defparam dcm_adv_clk_main.DESKEW_ADJUST         = "SYSTEM_SYNCHRONOUS";

defparam dcm_adv_clk_main.DFS_FREQUENCY_MODE    = "LOW";

defparam dcm_adv_clk_main.DLL_FREQUENCY_MODE    = "LOW";

defparam dcm_adv_clk_main.DUTY_CYCLE_CORRECTION = "TRUE";

defparam dcm_adv_clk_main.FACTORY_JF            = 16'hC080;

defparam dcm_adv_clk_main.PHASE_SHIFT           = 0;

defparam dcm_adv_clk_main.STARTUP_WAIT          = "FALSE";

defparam dcm_adv_clk_main.CLKFX_DIVIDE          = 5;

defparam dcm_adv_clk_main.CLKFX_MULTIPLY        = 2;

// synopsys translate_on

`else

DCM dcm_adv_clk_main (

// OUTPUTs

    .CLKDV        (dcm_clk),

    .CLKFX        (),

    .CLKFX180     (),

    .CLK0         (CLK0_BUF),

    .CLK2X        (),

    .CLK2X180     (),

    .CLK90        (),

    .CLK180       (),

    .CLK270       (),

    .LOCKED       (dcm_locked),

    .PSDONE       (),

    .STATUS       (),

// INPUTs

    .CLKFB        (CLKFB_IN),

    .CLKIN        (clk_50M_in),

    .PSEN         (1'b0),

    .PSINCDEC     (1'b0),

    .DSSEN        (1'b0),

    .PSCLK        (1'b0),

    .RST          (reset_pin)

);

BUFG CLK0_BUFG_INST (

    .I(CLK0_BUF),

    .O(CLKFB_IN)

);

// synopsys translate_off

defparam dcm_adv_clk_main.CLK_FEEDBACK          = "1X";

defparam dcm_adv_clk_main.CLKDV_DIVIDE          = 2.5;

defparam dcm_adv_clk_main.CLKFX_DIVIDE          = 1;

defparam dcm_adv_clk_main.CLKFX_MULTIPLY        = 4;

defparam dcm_adv_clk_main.CLKIN_DIVIDE_BY_2     = "FALSE";

defparam dcm_adv_clk_main.CLKIN_PERIOD          = 20.000;

defparam dcm_adv_clk_main.CLKOUT_PHASE_SHIFT    = "NONE";

defparam dcm_adv_clk_main.DESKEW_ADJUST         = "SYSTEM_SYNCHRONOUS";

defparam dcm_adv_clk_main.DFS_FREQUENCY_MODE    = "LOW";

defparam dcm_adv_clk_main.DLL_FREQUENCY_MODE    = "LOW";

defparam dcm_adv_clk_main.DUTY_CYCLE_CORRECTION = "TRUE";

defparam dcm_adv_clk_main.FACTORY_JF            = 16'h8080;

defparam dcm_adv_clk_main.PHASE_SHIFT           = 0;

defparam dcm_adv_clk_main.STARTUP_WAIT          = "FALSE";

// synopsys translate_on  

`endif

//wire    dcm_locked = 1'b1;

//wire      reset_n;

//reg     dcm_clk;

//always @(posedge clk_50M_in)

//  if (~reset_n) dcm_clk <= 1'b0;

//  else          dcm_clk <= ~dcm_clk;

// Clock buffers

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

BUFG  buf_sys_clock  (.O(clk_sys), .I(dcm_clk));

//=============================================================================

// 3)  RESET GENERATION & FPGA STARTUP

//=============================================================================

// Reset input buffer

IBUF   ibuf_reset_n   (.O(reset_pin), .I(BTN3));

wire reset_pin_n = ~reset_pin;

// Release the reset only, if the DCM is locked

assign  reset_n = reset_pin_n & dcm_locked;

//Include the startup device   

wire  gsr_tb;

wire  gts_tb;

STARTUP_SPARTAN3 xstartup (.CLK(clk_sys), .GSR(gsr_tb), .GTS(gts_tb));

//=============================================================================

// 4)  OPENMSP430

//=============================================================================

openMSP430 openMSP430_0 (

// OUTPUTs

    .aclk              (),             // ASIC ONLY: ACLK

    .aclk_en           (aclk_en),      // FPGA ONLY: ACLK enable

    .dbg_freeze        (dbg_freeze),   // Freeze peripherals

    .dbg_i2c_sda_out   (),             // Debug interface: I2C SDA OUT

    .dbg_uart_txd      (dbg_uart_txd), // Debug interface: UART TXD

    .dco_enable        (),             // ASIC ONLY: Fast oscillator enable

    .dco_wkup          (),             // ASIC ONLY: Fast oscillator wake-up (asynchronous)

    .dmem_addr         (dmem_addr),    // Data Memory address

    .dmem_cen          (dmem_cen),     // Data Memory chip enable (low active)

    .dmem_din          (dmem_din),     // Data Memory data input

    .dmem_wen          (dmem_wen),     // Data Memory write enable (low active)

    .irq_acc           (irq_acc),      // Interrupt request accepted (one-hot signal)

    .lfxt_enable       (),             // ASIC ONLY: Low frequency oscillator enable

    .lfxt_wkup         (),             // ASIC ONLY: Low frequency oscillator wake-up (asynchronous)

    .mclk              (mclk),         // Main system clock

    .per_addr          (per_addr),     // Peripheral address

    .per_din           (per_din),      // Peripheral data input

    .per_we            (per_we),       // Peripheral write enable (high active)

    .per_en            (per_en),       // Peripheral enable (high active)

    .pmem_addr         (pmem_addr),    // Program Memory address

    .pmem_cen          (pmem_cen),     // Program Memory chip enable (low active)

    .pmem_din          (pmem_din),     // Program Memory data input (optional)

    .pmem_wen          (pmem_wen),     // Program Memory write enable (low active) (optional)

    .puc_rst           (puc_rst),      // Main system reset

    .smclk             (),             // ASIC ONLY: SMCLK

    .smclk_en          (smclk_en),     // FPGA ONLY: SMCLK enable

// INPUTs

    .cpu_en            (1'b1),         // Enable CPU code execution (asynchronous and non-glitchy)

    .dbg_en            (1'b1),         // Debug interface enable (asynchronous and non-glitchy)

    .dbg_i2c_addr      (7'h00),        // Debug interface: I2C Address

    .dbg_i2c_broadcast (7'h00),        // Debug interface: I2C Broadcast Address (for multicore systems)

    .dbg_i2c_scl       (1'b1),         // Debug interface: I2C SCL

    .dbg_i2c_sda_in    (1'b1),         // Debug interface: I2C SDA IN

    .dbg_uart_rxd      (dbg_uart_rxd), // Debug interface: UART RXD (asynchronous)

    .dco_clk           (clk_sys),      // Fast oscillator (fast clock)

    .dmem_dout         (dmem_dout),    // Data Memory data output

    .irq               (irq_bus),      // Maskable interrupts

    .lfxt_clk          (1'b0),         // Low frequency oscillator (typ 32kHz)

    .nmi               (nmi),          // Non-maskable interrupt (asynchronous)

    .per_dout          (per_dout),     // Peripheral data output

    .pmem_dout         (pmem_dout),    // Program Memory data output

    .reset_n           (reset_n),      // Reset Pin (low active, asynchronous and non-glitchy)

    .scan_enable       (1'b0),         // ASIC ONLY: Scan enable (active during scan shifting)

    .scan_mode         (1'b0),         // ASIC ONLY: Scan mode

    .wkup              (1'b0)          // ASIC ONLY: System Wake-up (asynchronous and non-glitchy)

);

//=============================================================================

// 5)  OPENMSP430 PERIPHERALS

//=============================================================================

//

// Digital I/O

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

omsp_gpio #(.P1_EN(1),

            .P2_EN(1),

            .P3_EN(1),

            .P4_EN(0),

            .P5_EN(0),

            .P6_EN(0)) gpio_0 (

// OUTPUTs

    .irq_port1    (irq_port1),     // Port 1 interrupt

    .irq_port2    (irq_port2),     // Port 2 interrupt

    .p1_dout      (p1_dout),       // Port 1 data output

    .p1_dout_en   (p1_dout_en),    // Port 1 data output enable

    .p1_sel       (p1_sel),        // Port 1 function select

    .p2_dout      (p2_dout),       // Port 2 data output

    .p2_dout_en   (p2_dout_en),    // Port 2 data output enable

    .p2_sel       (p2_sel),        // Port 2 function select

    .p3_dout      (p3_dout),       // Port 3 data output

    .p3_dout_en   (p3_dout_en),    // Port 3 data output enable

    .p3_sel       (p3_sel),        // Port 3 function select

    .p4_dout      (),              // Port 4 data output

    .p4_dout_en   (),              // Port 4 data output enable

    .p4_sel       (),              // Port 4 function select

    .p5_dout      (),              // Port 5 data output

    .p5_dout_en   (),              // Port 5 data output enable

    .p5_sel       (),              // Port 5 function select

    .p6_dout      (),              // Port 6 data output

    .p6_dout_en   (),              // Port 6 data output enable

    .p6_sel       (),              // Port 6 function select

    .per_dout     (per_dout_dio),  // Peripheral data output

// INPUTs

    .mclk         (mclk),          // Main system clock

    .p1_din       (p1_din),        // Port 1 data input

    .p2_din       (p2_din),        // Port 2 data input

    .p3_din       (p3_din),        // Port 3 data input

    .p4_din       (8'h00),         // Port 4 data input

    .p5_din       (8'h00),         // Port 5 data input

    .p6_din       (8'h00),         // Port 6 data input

    .per_addr     (per_addr),      // Peripheral address

    .per_din      (per_din),       // Peripheral data input

    .per_en       (per_en),        // Peripheral enable (high active)

    .per_we       (per_we),        // Peripheral write enable (high active)

    .puc_rst      (puc_rst)        // Main system reset

);

//

// Timer A

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

omsp_timerA timerA_0 (

// OUTPUTs

    .irq_ta0      (irq_ta0),       // Timer A interrupt: TACCR0

    .irq_ta1      (irq_ta1),       // Timer A interrupt: TAIV, TACCR1, TACCR2

    .per_dout     (per_dout_tA),   // Peripheral data output

    .ta_out0      (ta_out0),       // Timer A output 0

    .ta_out0_en   (ta_out0_en),    // Timer A output 0 enable

    .ta_out1      (ta_out1),       // Timer A output 1

    .ta_out1_en   (ta_out1_en),    // Timer A output 1 enable

    .ta_out2      (ta_out2),       // Timer A output 2

    .ta_out2_en   (ta_out2_en),    // Timer A output 2 enable

// INPUTs

    .aclk_en      (aclk_en),       // ACLK enable (from CPU)

    .dbg_freeze   (dbg_freeze),    // Freeze Timer A counter

    .inclk        (inclk),         // INCLK external timer clock (SLOW)

    .irq_ta0_acc  (irq_acc[9]),    // Interrupt request TACCR0 accepted

    .mclk         (mclk),          // Main system clock

    .per_addr     (per_addr),      // Peripheral address

    .per_din      (per_din),       // Peripheral data input

    .per_en       (per_en),        // Peripheral enable (high active)

    .per_we       (per_we),        // Peripheral write enable (high active)

    .puc_rst      (puc_rst),       // Main system reset

    .smclk_en     (smclk_en),      // SMCLK enable (from CPU)

    .ta_cci0a     (ta_cci0a),      // Timer A capture 0 input A

    .ta_cci0b     (ta_cci0b),      // Timer A capture 0 input B

    .ta_cci1a     (ta_cci1a),      // Timer A capture 1 input A

    .ta_cci1b     (1'b0),          // Timer A capture 1 input B

    .ta_cci2a     (ta_cci2a),      // Timer A capture 2 input A

    .ta_cci2b     (1'b0),          // Timer A capture 2 input B

    .taclk        (taclk)          // TACLK external timer clock (SLOW)

);

//

// Four-Digit, Seven-Segment LED Display driver

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

driver_7segment driver_7segment_0 (

// OUTPUTs

    .per_dout     (per_dout_7seg), // Peripheral data output

    .seg_a        (seg_a_),        // Segment A control

    .seg_b        (seg_b_),        // Segment B control

    .seg_c        (seg_c_),        // Segment C control

    .seg_d        (seg_d_),        // Segment D control

    .seg_e        (seg_e_),        // Segment E control

    .seg_f        (seg_f_),        // Segment F control

    .seg_g        (seg_g_),        // Segment G control

    .seg_dp       (seg_dp_),       // Segment DP control

    .seg_an0      (seg_an0_),      // Anode 0 control

    .seg_an1      (seg_an1_),      // Anode 1 control

    .seg_an2      (seg_an2_),      // Anode 2 control

    .seg_an3      (seg_an3_),      // Anode 3 control

// INPUTs

    .mclk         (mclk),          // Main system clock

    .per_addr     (per_addr),      // Peripheral address

    .per_din      (per_din),       // Peripheral data input

    .per_en       (per_en),        // Peripheral enable (high active)

    .per_we       (per_we),        // Peripheral write enable (high active)

    .puc_rst      (puc_rst)        // Main system reset

);

//

// Simple full duplex UART (8N1 protocol)

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

omsp_uart #(.BASE_ADDR(15'h0080)) uart_0 (

// OUTPUTs

    .irq_uart_rx  (irq_uart_rx),   // UART receive interrupt

    .irq_uart_tx  (irq_uart_tx),   // UART transmit interrupt

    .per_dout     (per_dout_uart), // Peripheral data output

    .uart_txd     (hw_uart_txd),   // UART Data Transmit (TXD)

// INPUTs

    .mclk         (mclk),          // Main system clock

    .per_addr     (per_addr),      // Peripheral address

    .per_din      (per_din),       // Peripheral data input

    .per_en       (per_en),        // Peripheral enable (high active)

    .per_we       (per_we),        // Peripheral write enable (high active)

    .puc_rst      (puc_rst),       // Main system reset

    .smclk_en     (smclk_en),      // SMCLK enable (from CPU)

    .uart_rxd     (hw_uart_rxd)    // UART Data Receive (RXD)

);

//

// Combine peripheral data buses

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

assign per_dout = per_dout_dio  |

                  per_dout_tA   |

                  per_dout_7seg |

                  per_dout_uart;

//

// Assign interrupts

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

assign nmi        =  1'b0;

assign irq_bus    = {1'b0,         // Vector 13  (0xFFFA)

                     1'b0,         // Vector 12  (0xFFF8)