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

// Copyright (C) 2009 , Olivier Girard

//

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

// modification, are permitted provided that the following conditions

// are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * 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.

//     * Neither the name of the authors nor the names of its contributors

//       may be used to endorse or promote products derived from this software

//       without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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

//

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

//

// *File Name: openMSP430.v

// 

// *Module Description:

//                       openMSP430 Top level file

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev: 117 $

// $LastChangedBy: olivier.girard $

// $LastChangedDate: 2011-06-23 21:30:51 +0200 (Thu, 23 Jun 2011) $

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

`ifdef OMSP_NO_INCLUDE

`else

`include "openMSP430_defines.v"

`endif

module  openMSP430 (

// OUTPUTs

    aclk_en,                       // ACLK enable

    dbg_freeze,                    // Freeze peripherals

    dbg_uart_txd,                  // Debug interface: UART TXD

    dmem_addr,                     // Data Memory address

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

    dmem_din,                      // Data Memory data input

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

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

    mclk,                          // Main system clock

    per_addr,                      // Peripheral address

    per_din,                       // Peripheral data input

    per_we,                        // Peripheral write enable (high active)

    per_en,                        // Peripheral enable (high active)

    pmem_addr,                     // Program Memory address

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

    pmem_din,                      // Program Memory data input (optional)

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

    puc_rst,                       // Main system reset

    smclk_en,                      // SMCLK enable

// INPUTs

    cpu_en,                        // Enable CPU code execution (asynchronous)

    dbg_en,                        // Debug interface enable (asynchronous)

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

    dco_clk,                       // Fast oscillator (fast clock)

    dmem_dout,                     // Data Memory data output

    irq,                           // Maskable interrupts

    lfxt_clk,                      // Low frequency oscillator (typ 32kHz)

    nmi,                           // Non-maskable interrupt (asynchronous)

    per_dout,                      // Peripheral data output

    pmem_dout,                     // Program Memory data output

    reset_n                        // Reset Pin (low active, asynchronous)

);

// OUTPUTs

//=========

output               aclk_en;      // ACLK enable

output               dbg_freeze;   // Freeze peripherals

output               dbg_uart_txd; // Debug interface: UART TXD

output [`DMEM_MSB:0] dmem_addr;    // Data Memory address

output               dmem_cen;     // Data Memory chip enable (low active)

output        [15:0] dmem_din;     // Data Memory data input

output         [1:0] dmem_wen;     // Data Memory write enable (low active)

output        [13:0] irq_acc;      // Interrupt request accepted (one-hot signal)

output               mclk;         // Main system clock

output        [13:0] per_addr;     // Peripheral address

output        [15:0] per_din;      // Peripheral data input

output         [1:0] per_we;       // Peripheral write enable (high active)

output               per_en;       // Peripheral enable (high active)

output [`PMEM_MSB:0] pmem_addr;    // Program Memory address

output               pmem_cen;     // Program Memory chip enable (low active)

output        [15:0] pmem_din;     // Program Memory data input (optional)

output         [1:0] pmem_wen;     // Program Memory write enable (low active) (optional)

output               puc_rst;      // Main system reset

output               smclk_en;     // SMCLK enable

// INPUTs

//=========

input                cpu_en;       // Enable CPU code execution (asynchronous)

input                dbg_en;       // Debug interface enable (asynchronous)

input                dbg_uart_rxd; // Debug interface: UART RXD (asynchronous)

input                dco_clk;      // Fast oscillator (fast clock)

input         [15:0] dmem_dout;    // Data Memory data output

input         [13:0] irq;          // Maskable interrupts

input                lfxt_clk;     // Low frequency oscillator (typ 32kHz)

input                nmi;          // Non-maskable interrupt (asynchronous)

input         [15:0] per_dout;     // Peripheral data output

input         [15:0] pmem_dout;    // Program Memory data output

input                reset_n;      // Reset Pin (active low, asynchronous)

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

// 1)  INTERNAL WIRES/REGISTERS/PARAMETERS DECLARATION

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

wire          [7:0] inst_ad;

wire          [7:0] inst_as;

wire         [11:0] inst_alu;

wire                inst_bw;

wire                inst_irq_rst;

wire                inst_mov;

wire         [15:0] inst_dest;

wire         [15:0] inst_dext;

wire         [15:0] inst_sext;

wire          [7:0] inst_so;

wire         [15:0] inst_src;

wire          [2:0] inst_type;

wire          [7:0] inst_jmp;

wire          [3:0] e_state;

wire                exec_done;

wire                decode_noirq;

wire                cpu_en_s;

wire                cpuoff;

wire                oscoff;

wire                scg1;

wire                por;

wire                gie;

wire         [15:0] eu_mab;

wire         [15:0] eu_mdb_in;

wire         [15:0] eu_mdb_out;

wire          [1:0] eu_mb_wr;

wire                eu_mb_en;

wire         [15:0] fe_mab;

wire         [15:0] fe_mdb_in;

wire                fe_mb_en;

wire                fe_pmem_wait;

wire                pc_sw_wr;

wire         [15:0] pc_sw;

wire         [15:0] pc;

wire         [15:0] pc_nxt;

wire                nmie;

wire                nmi_acc;

wire                nmi_evt;

wire                wdtie;

wire                wdtifg_set;

wire                wdtpw_error;

wire                wdttmsel;

wire                wdt_irq;

wire                wdt_reset;

wire                dbg_clk;

wire                dbg_rst;

wire                dbg_en_s;

wire                dbg_halt_st;

wire                dbg_halt_cmd;

wire                dbg_mem_en;

wire                dbg_reg_wr;

wire                dbg_cpu_reset;

wire         [15:0] dbg_mem_addr;

wire         [15:0] dbg_mem_dout;

wire         [15:0] dbg_mem_din;

wire         [15:0] dbg_reg_din;

wire          [1:0] dbg_mem_wr;

wire         [15:0] per_dout_or;

wire         [15:0] per_dout_sfr;

wire         [15:0] per_dout_wdog;

wire         [15:0] per_dout_mpy;

wire         [15:0] per_dout_clk;

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

// 2)  GLOBAL CLOCK & RESET MANAGEMENT

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

omsp_clock_module clock_module_0 (

// OUTPUTs

    .aclk_en      (aclk_en),       // ACLK enablex

    .cpu_en_s     (cpu_en_s),      // Enable CPU code execution (synchronous)

    .dbg_clk      (dbg_clk),       // Debug unit clock

    .dbg_en_s     (dbg_en_s),      // Debug interface enable (synchronous)

    .dbg_rst      (dbg_rst),       // Debug unit reset

    .mclk         (mclk),          // Main system clock

    .per_dout     (per_dout_clk),  // Peripheral data output

    .por          (por),           // Power-on reset

    .puc_rst      (puc_rst),       // Main system reset

    .smclk_en     (smclk_en),      // SMCLK enable

// INPUTs

    .cpu_en       (cpu_en),        // Enable CPU code execution (asynchronous)

    .dbg_cpu_reset(dbg_cpu_reset), // Reset CPU from debug interface

    .dbg_en       (dbg_en),        // Debug interface enable (asynchronous)

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

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

    .oscoff       (oscoff),        // Turns off LFXT1 clock 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)

    .reset_n      (reset_n),       // Reset Pin (low active, asynchronous)

    .scg1         (scg1),          // System clock generator 1. Turns off the SMCLK

    .wdt_reset    (wdt_reset)      // Watchdog-timer reset

);

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

// 3)  FRONTEND (<=> FETCH & DECODE)

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

omsp_frontend frontend_0 (

// OUTPUTs

    .dbg_halt_st  (dbg_halt_st),   // Halt/Run status from CPU

    .decode_noirq (decode_noirq),  // Frontend decode instruction

    .e_state      (e_state),       // Execution state

    .exec_done    (exec_done),     // Execution completed

    .inst_ad      (inst_ad),       // Decoded Inst: destination addressing mode

    .inst_as      (inst_as),       // Decoded Inst: source addressing mode

    .inst_alu     (inst_alu),      // ALU control signals

    .inst_bw      (inst_bw),       // Decoded Inst: byte width

    .inst_dest    (inst_dest),     // Decoded Inst: destination (one hot)

    .inst_dext    (inst_dext),     // Decoded Inst: destination extended instruction word

    .inst_irq_rst (inst_irq_rst),  // Decoded Inst: Reset interrupt

    .inst_jmp     (inst_jmp),      // Decoded Inst: Conditional jump

    .inst_mov     (inst_mov),      // Decoded Inst: mov instruction

    .inst_sext    (inst_sext),     // Decoded Inst: source extended instruction word

    .inst_so      (inst_so),       // Decoded Inst: Single-operand arithmetic

    .inst_src     (inst_src),      // Decoded Inst: source (one hot)

    .inst_type    (inst_type),     // Decoded Instruction type

    .irq_acc      (irq_acc),       // Interrupt request accepted

    .mab          (fe_mab),        // Frontend Memory address bus

    .mb_en        (fe_mb_en),      // Frontend Memory bus enable

    .nmi_acc      (nmi_acc),       // Non-Maskable interrupt request accepted

    .pc           (pc),            // Program counter

    .pc_nxt       (pc_nxt),        // Next PC value (for CALL & IRQ)

// INPUTs

    .cpu_en_s     (cpu_en_s),      // Enable CPU code execution (synchronous)

    .cpuoff       (cpuoff),        // Turns off the CPU

    .dbg_halt_cmd (dbg_halt_cmd),  // Halt CPU command

    .dbg_reg_sel  (dbg_mem_addr[3:0]), // Debug selected register for rd/wr access

    .fe_pmem_wait (fe_pmem_wait),  // Frontend wait for Instruction fetch

    .gie          (gie),           // General interrupt enable

    .irq          (irq),           // Maskable interrupts

    .mclk         (mclk),          // Main system clock

    .mdb_in       (fe_mdb_in),     // Frontend Memory data bus input

    .nmi_evt      (nmi_evt),       // Non-maskable interrupt event

    .pc_sw        (pc_sw),         // Program counter software value

    .pc_sw_wr     (pc_sw_wr),      // Program counter software write

    .puc_rst      (puc_rst),       // Main system reset

    .wdt_irq      (wdt_irq)        // Watchdog-timer interrupt

);

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

// 4)  EXECUTION UNIT

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

omsp_execution_unit execution_unit_0 (

// OUTPUTs

    .cpuoff       (cpuoff),        // Turns off the CPU

    .dbg_reg_din  (dbg_reg_din),   // Debug unit CPU register data input

    .mab          (eu_mab),        // Memory address bus

    .mb_en        (eu_mb_en),      // Memory bus enable

    .mb_wr        (eu_mb_wr),      // Memory bus write transfer

    .mdb_out      (eu_mdb_out),    // Memory data bus output

    .oscoff       (oscoff),        // Turns off LFXT1 clock input

    .pc_sw        (pc_sw),         // Program counter software value

    .pc_sw_wr     (pc_sw_wr),      // Program counter software write

    .scg1         (scg1),          // System clock generator 1. Turns off the SMCLK

// INPUTs

    .dbg_halt_st  (dbg_halt_st),   // Halt/Run status from CPU

    .dbg_mem_dout (dbg_mem_dout),  // Debug unit data output

    .dbg_reg_wr   (dbg_reg_wr),    // Debug unit CPU register write

    .e_state      (e_state),       // Execution state

    .exec_done    (exec_done),     // Execution completed

    .gie          (gie),           // General interrupt enable

    .inst_ad      (inst_ad),       // Decoded Inst: destination addressing mode

    .inst_as      (inst_as),       // Decoded Inst: source addressing mode

    .inst_alu     (inst_alu),      // ALU control signals

    .inst_bw      (inst_bw),       // Decoded Inst: byte width

    .inst_dest    (inst_dest),     // Decoded Inst: destination (one hot)

    .inst_dext    (inst_dext),     // Decoded Inst: destination extended instruction word

    .inst_irq_rst (inst_irq_rst),  // Decoded Inst: reset interrupt

    .inst_jmp     (inst_jmp),      // Decoded Inst: Conditional jump

    .inst_mov     (inst_mov),      // Decoded Inst: mov instruction

    .inst_sext    (inst_sext),     // Decoded Inst: source extended instruction word

    .inst_so      (inst_so),       // Decoded Inst: Single-operand arithmetic

    .inst_src     (inst_src),      // Decoded Inst: source (one hot)

    .inst_type    (inst_type),     // Decoded Instruction type

    .mclk         (mclk),          // Main system clock

    .mdb_in       (eu_mdb_in),     // Memory data bus input

    .pc           (pc),            // Program counter

    .pc_nxt       (pc_nxt),        // Next PC value (for CALL & IRQ)

    .puc_rst      (puc_rst)        // Main system reset

);

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

// 5)  MEMORY BACKBONE

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

omsp_mem_backbone mem_backbone_0 (

// OUTPUTs

    .dbg_mem_din  (dbg_mem_din),   // Debug unit Memory data input

    .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)

    .eu_mdb_in    (eu_mdb_in),     // Execution Unit Memory data bus input

    .fe_mdb_in    (fe_mdb_in),     // Frontend Memory data bus input

    .fe_pmem_wait (fe_pmem_wait),  // Frontend wait for Instruction fetch

    .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)

// INPUTs

    .dbg_halt_st  (dbg_halt_st),   // Halt/Run status from CPU

    .dbg_mem_addr (dbg_mem_addr),  // Debug address for rd/wr access

    .dbg_mem_dout (dbg_mem_dout),  // Debug unit data output

    .dbg_mem_en   (dbg_mem_en),    // Debug unit memory enable

    .dbg_mem_wr   (dbg_mem_wr),    // Debug unit memory write

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

    .eu_mab       (eu_mab[15:1]),  // Execution Unit Memory address bus

    .eu_mb_en     (eu_mb_en),      // Execution Unit Memory bus enable

    .eu_mb_wr     (eu_mb_wr),      // Execution Unit Memory bus write transfer

    .eu_mdb_out   (eu_mdb_out),    // Execution Unit Memory data bus output

    .fe_mab       (fe_mab[15:1]),  // Frontend Memory address bus

    .fe_mb_en     (fe_mb_en),      // Frontend Memory bus enable

    .mclk         (mclk),          // Main system clock

    .per_dout     (per_dout_or),   // Peripheral data output

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

    .puc_rst      (puc_rst)        // Main system reset

);

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

// 6)  SPECIAL FUNCTION REGISTERS

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

omsp_sfr sfr_0 (

// OUTPUTs

    .nmie         (nmie),          // Non-maskable interrupt enable

    .per_dout     (per_dout_sfr),  // Peripheral data output

    .wdt_irq      (wdt_irq),       // Watchdog-timer interrupt

    .wdt_reset    (wdt_reset),     // Watchdog-timer reset

    .wdtie        (wdtie),         // Watchdog-timer interrupt enable

// INPUTs

    .mclk         (mclk),          // Main system clock

    .nmi_acc      (nmi_acc),       // Non-Maskable interrupt request accepted

    .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)

    .por          (por),           // Power-on reset

    .puc_rst      (puc_rst),       // Main system reset

    .wdtifg_clr   (irq_acc[10]),   // Clear Watchdog-timer interrupt flag

    .wdtifg_set   (wdtifg_set),    // Set Watchdog-timer interrupt flag

    .wdtpw_error  (wdtpw_error),   // Watchdog-timer password error

    .wdttmsel     (wdttmsel)       // Watchdog-timer mode select

);

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

// 7)  WATCHDOG TIMER

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

omsp_watchdog watchdog_0 (

// OUTPUTs

    .nmi_evt      (nmi_evt),       // NMI Event

    .per_dout     (per_dout_wdog), // Peripheral data output

    .wdtifg_set   (wdtifg_set),    // Set Watchdog-timer interrupt flag

    .wdtpw_error  (wdtpw_error),   // Watchdog-timer password error

    .wdttmsel     (wdttmsel),      // Watchdog-timer mode select

// INPUTs

    .aclk_en      (aclk_en),       // ACLK enable

    .dbg_freeze   (dbg_freeze),    // Freeze Watchdog counter

    .mclk         (mclk),          // Main system clock

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

    .nmie         (nmie),          // Non-maskable interrupt enable

    .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

    .wdtie        (wdtie)          // Watchdog-timer interrupt enable

);

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

// 8)  HARDWARE MULTIPLIER

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

`ifdef MULTIPLIER

omsp_multiplier multiplier_0 (

// OUTPUTs

    .per_dout     (per_dout_mpy),  // Peripheral data output

// 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

);

`else

assign per_dout_mpy = 16'h0000;

`endif

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

// 9)  PERIPHERALS' OUTPUT BUS

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

assign  per_dout_or  =  per_dout      |

                        per_dout_clk  |

                        per_dout_sfr  |

                        per_dout_wdog |

                        per_dout_mpy;

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

// 10)  DEBUG INTERFACE

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

`ifdef DBG_EN

omsp_dbg dbg_0 (

// OUTPUTs

    .dbg_freeze   (dbg_freeze),    // Freeze peripherals

    .dbg_halt_cmd (dbg_halt_cmd),  // Halt CPU command

    .dbg_mem_addr (dbg_mem_addr),  // Debug address for rd/wr access

    .dbg_mem_dout (dbg_mem_dout),  // Debug unit data output

    .dbg_mem_en   (dbg_mem_en),    // Debug unit memory enable

    .dbg_mem_wr   (dbg_mem_wr),    // Debug unit memory write

    .dbg_reg_wr   (dbg_reg_wr),    // Debug unit CPU register write

    .dbg_cpu_reset(dbg_cpu_reset), // Reset CPU from debug interface

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

// INPUTs

    .cpu_en_s     (cpu_en_s),      // Enable CPU code execution (synchronous)

    .dbg_clk      (dbg_clk),       // Debug unit clock

    .dbg_en_s     (dbg_en_s),      // Debug interface enable (synchronous)

    .dbg_halt_st  (dbg_halt_st),   // Halt/Run status from CPU

    .dbg_mem_din  (dbg_mem_din),   // Debug unit Memory data input

    .dbg_reg_din  (dbg_reg_din),   // Debug unit CPU register data input

    .dbg_rst      (dbg_rst),       // Debug unit reset

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

    .decode_noirq (decode_noirq),  // Frontend decode instruction

    .eu_mab       (eu_mab),        // Execution-Unit Memory address bus

    .eu_mb_en     (eu_mb_en),      // Execution-Unit Memory bus enable

    .eu_mb_wr     (eu_mb_wr),      // Execution-Unit Memory bus write transfer

    .eu_mdb_in    (eu_mdb_in),     // Memory data bus input

    .eu_mdb_out   (eu_mdb_out),    // Memory data bus output

    .exec_done    (exec_done),     // Execution completed

    .fe_mb_en     (fe_mb_en),      // Frontend Memory bus enable

    .fe_mdb_in    (fe_mdb_in),     // Frontend Memory data bus input

    .pc           (pc),            // Program counter

    .puc_rst      (puc_rst)        // Main system reset

);

`else

assign dbg_freeze    =  ~cpu_en_s;

assign dbg_halt_cmd  =  1'b0;

assign dbg_mem_addr  = 16'h0000;

assign dbg_mem_dout  = 16'h0000;

assign dbg_mem_en    =  1'b0;

assign dbg_mem_wr    =  2'b00;

assign dbg_reg_wr    =  1'b0;

assign dbg_cpu_reset =  1'b0;

assign dbg_uart_txd  =  1'b0;

`endif

endmodule // openMSP430

`ifdef OMSP_NO_INCLUDE

`else

`include "openMSP430_undefines.v"

`endif