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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: tb_openMSP430.v

//

// *Module Description:

//                      openMSP430 testbench

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev: 205 $

// $LastChangedBy: olivier.girard $

// $LastChangedDate: 2015-07-15 22:59:52 +0200 (Wed, 15 Jul 2015) $

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

`include "timescale.v"

`ifdef OMSP_NO_INCLUDE

`else

`include "openMSP430_defines.v"

`endif

module  tb_openMSP430;

//

// Wire & Register definition

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

// Data Memory interface

wire [`DMEM_MSB:0] dmem_addr;

wire               dmem_cen;

wire        [15:0] dmem_din;

wire         [1:0] dmem_wen;

wire        [15:0] dmem_dout;

// Program Memory interface

wire [`PMEM_MSB:0] pmem_addr;

wire               pmem_cen;

wire        [15:0] pmem_din;

wire         [1:0] pmem_wen;

wire        [15:0] pmem_dout;

// Peripherals interface

wire        [13:0] per_addr;

wire        [15:0] per_din;

wire        [15:0] per_dout;

wire         [1:0] per_we;

wire               per_en;

// Direct Memory Access interface

wire        [15:0] dma_dout;

wire               dma_ready;

wire               dma_resp;

reg         [15:1] dma_addr;

reg         [15:0] dma_din;

reg                dma_en;

reg                dma_priority;

reg          [1:0] dma_we;

reg                dma_wkup;

// Digital I/O

wire               irq_port1;

wire               irq_port2;

wire        [15:0] per_dout_dio;

wire         [7:0] p1_dout;

wire         [7:0] p1_dout_en;

wire         [7:0] p1_sel;

wire         [7:0] p2_dout;

wire         [7:0] p2_dout_en;

wire         [7:0] p2_sel;

wire         [7:0] p3_dout;

wire         [7:0] p3_dout_en;

wire         [7:0] p3_sel;

wire         [7:0] p4_dout;

wire         [7:0] p4_dout_en;

wire         [7:0] p4_sel;

wire         [7:0] p5_dout;

wire         [7:0] p5_dout_en;

wire         [7:0] p5_sel;

wire         [7:0] p6_dout;

wire         [7:0] p6_dout_en;

wire         [7:0] p6_sel;

reg          [7:0] p1_din;

reg          [7:0] p2_din;

reg          [7:0] p3_din;

reg          [7:0] p4_din;

reg          [7:0] p5_din;

reg          [7:0] p6_din;

// Peripheral templates

wire        [15:0] per_dout_temp_8b;

wire        [15:0] per_dout_temp_16b;

// Timer A

wire               irq_ta0;

wire               irq_ta1;

wire        [15:0] per_dout_timerA;

reg                inclk;

reg                taclk;

reg                ta_cci0a;

reg                ta_cci0b;

reg                ta_cci1a;

reg                ta_cci1b;

reg                ta_cci2a;

reg                ta_cci2b;

wire               ta_out0;

wire               ta_out0_en;

wire               ta_out1;

wire               ta_out1_en;

wire               ta_out2;

wire               ta_out2_en;

// Clock / Reset & Interrupts

reg                dco_clk;

wire               dco_enable;

wire               dco_wkup;

reg                dco_local_enable;

reg                lfxt_clk;

wire               lfxt_enable;

wire               lfxt_wkup;

reg                lfxt_local_enable;

wire               mclk;

wire               aclk;

wire               aclk_en;

wire               smclk;

wire               smclk_en;

reg                reset_n;

wire               puc_rst;

reg                nmi;

reg  [`IRQ_NR-3:0] irq;

wire [`IRQ_NR-3:0] irq_acc;

wire [`IRQ_NR-3:0] irq_in;

reg                cpu_en;

reg         [13:0] wkup;

wire        [13:0] wkup_in;

// Scan (ASIC version only)

reg                scan_enable;

reg                scan_mode;

// Debug interface: UART

reg                dbg_en;

wire               dbg_freeze;

wire               dbg_uart_txd;

wire               dbg_uart_rxd;

reg                dbg_uart_rxd_sel;

reg                dbg_uart_rxd_dly;

reg                dbg_uart_rxd_pre;

reg                dbg_uart_rxd_meta;

reg         [15:0] dbg_uart_buf;

reg                dbg_uart_rx_busy;

reg                dbg_uart_tx_busy;

// Debug interface: I2C

wire               dbg_scl;

wire               dbg_sda;

wire               dbg_scl_slave;

wire               dbg_scl_master;

reg                dbg_scl_master_sel;

reg                dbg_scl_master_dly;

reg                dbg_scl_master_pre;

reg                dbg_scl_master_meta;

wire               dbg_sda_slave_out;

wire               dbg_sda_slave_in;

wire               dbg_sda_master_out;

reg                dbg_sda_master_out_sel;

reg                dbg_sda_master_out_dly;

reg                dbg_sda_master_out_pre;

reg                dbg_sda_master_out_meta;

wire               dbg_sda_master_in;

reg         [15:0] dbg_i2c_buf;

reg     [8*32-1:0] dbg_i2c_string;

// Core testbench debuging signals

wire    [8*32-1:0] i_state;

wire    [8*32-1:0] e_state;

wire        [31:0] inst_cycle;

wire    [8*32-1:0] inst_full;

wire        [31:0] inst_number;

wire        [15:0] inst_pc;

wire    [8*32-1:0] inst_short;

// Testbench variables

integer            tb_idx;

integer            tmp_seed;

integer            error;

reg                stimulus_done;

//

// Include files

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

// CPU & Memory registers

`include "registers.v"

// Debug interface tasks

`include "dbg_uart_tasks.v"

`include "dbg_i2c_tasks.v"

// Direct Memory Access interface tasks

`include "dma_tasks.v"

// Verilog stimulus

`include "stimulus.v"

//

// Initialize Memory

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

initial

  begin

     // Initialize data memory

     for (tb_idx=0; tb_idx < `DMEM_SIZE/2; tb_idx=tb_idx+1)

       dmem_0.mem[tb_idx] = 16'h0000;

     // Initialize program memory

     #10 $readmemh("./pmem.mem", pmem_0.mem);

  end

//

// Generate Clock & Reset

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

initial

  begin

     dco_clk          = 1'b0;

     dco_local_enable = 1'b0;

     forever

       begin

          #25;   // 20 MHz

          dco_local_enable = (dco_enable===1) ? dco_enable : (dco_wkup===1);

          if (dco_local_enable | scan_mode)

            dco_clk = ~dco_clk;

       end

  end

initial

  begin

     lfxt_clk          = 1'b0;

     lfxt_local_enable = 1'b0;

     forever

       begin

          #763;  // 655 kHz

          lfxt_local_enable = (lfxt_enable===1) ? lfxt_enable : (lfxt_wkup===1);

          if (lfxt_local_enable)

            lfxt_clk = ~lfxt_clk;

       end

  end

initial

  begin

     reset_n       = 1'b1;

     #93;

     reset_n       = 1'b0;

     #593;

     reset_n       = 1'b1;

  end

initial

  begin

     tmp_seed                = `SEED;

     tmp_seed                = $urandom(tmp_seed);

     error                   = 0;

     stimulus_done           = 1;

     irq                     = {`IRQ_NR-2{1'b0}};

     nmi                     = 1'b0;

     wkup                    = 14'h0000;

     dma_addr                = 15'h0000;

     dma_din                 = 16'h0000;

     dma_en                  = 1'b0;

     dma_priority            = 1'b0;

     dma_we                  = 2'b00;

     dma_wkup                = 1'b0;

     dma_tfx_cancel          = 1'b0;

     cpu_en                  = 1'b1;

     dbg_en                  = 1'b0;

     dbg_uart_rxd_sel        = 1'b0;

     dbg_uart_rxd_dly        = 1'b1;

     dbg_uart_rxd_pre        = 1'b1;

     dbg_uart_rxd_meta       = 1'b0;

     dbg_uart_buf            = 16'h0000;

     dbg_uart_rx_busy        = 1'b0;

     dbg_uart_tx_busy        = 1'b0;

     dbg_scl_master_sel      = 1'b0;

     dbg_scl_master_dly      = 1'b1;

     dbg_scl_master_pre      = 1'b1;

     dbg_scl_master_meta     = 1'b0;

     dbg_sda_master_out_sel  = 1'b0;

     dbg_sda_master_out_dly  = 1'b1;

     dbg_sda_master_out_pre  = 1'b1;

     dbg_sda_master_out_meta = 1'b0;

     dbg_i2c_string          = "";

     p1_din                  = 8'h00;

     p2_din                  = 8'h00;

     p3_din                  = 8'h00;

     p4_din                  = 8'h00;

     p5_din                  = 8'h00;

     p6_din                  = 8'h00;

     inclk                   = 1'b0;

     taclk                   = 1'b0;

     ta_cci0a                = 1'b0;

     ta_cci0b                = 1'b0;

     ta_cci1a                = 1'b0;

     ta_cci1b                = 1'b0;

     ta_cci2a                = 1'b0;

     ta_cci2b                = 1'b0;

     scan_enable             = 1'b0;

     scan_mode               = 1'b0;

  end

//

// Program Memory

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

ram #(`PMEM_MSB, `PMEM_SIZE) pmem_0 (

// OUTPUTs

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

// INPUTs

    .ram_addr          (pmem_addr),            // Program Memory address

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

    .ram_clk           (mclk),                 // Program Memory clock

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

    .ram_wen           (pmem_wen)              // Program Memory write enable (low active)

);

//

// Data Memory

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

ram #(`DMEM_MSB, `DMEM_SIZE) dmem_0 (

// OUTPUTs

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

// INPUTs

    .ram_addr          (dmem_addr),            // Data Memory address

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

    .ram_clk           (mclk),                 // Data Memory clock

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

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

);

//

// openMSP430 Instance

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

openMSP430 dut (

// OUTPUTs

    .aclk              (aclk),                 // ASIC ONLY: ACLK

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

    .dbg_freeze        (dbg_freeze),           // Freeze peripherals

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

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

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

    .dco_wkup          (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 byte enable (low active)

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

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

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

    .mclk              (mclk),                 // Main system clock

    .dma_dout          (dma_dout),             // Direct Memory Access data output

    .dma_ready         (dma_ready),            // Direct Memory Access is complete

    .dma_resp          (dma_resp),             // Direct Memory Access response (0:Okay / 1:Error)

    .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 byte 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 byte enable (low active) (optional)

    .puc_rst           (puc_rst),              // Main system reset

    .smclk             (smclk),                // ASIC ONLY: SMCLK

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

// INPUTs

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

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

    .dbg_i2c_addr      (I2C_ADDR),             // Debug interface: I2C Address

    .dbg_i2c_broadcast (I2C_BROADCAST),        // Debug interface: I2C Broadcast Address (for multicore systems)

    .dbg_i2c_scl       (dbg_scl_slave),        // Debug interface: I2C SCL

    .dbg_i2c_sda_in    (dbg_sda_slave_in),     // Debug interface: I2C SDA IN

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

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

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

    .irq               (irq_in),               // Maskable interrupts

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

    .dma_addr          (dma_addr),             // Direct Memory Access address

    .dma_din           (dma_din),              // Direct Memory Access data input

    .dma_en            (dma_en),               // Direct Memory Access enable (high active)

    .dma_priority      (dma_priority),         // Direct Memory Access priority (0:low / 1:high)

    .dma_we            (dma_we),               // Direct Memory Access write byte enable (high active)

    .dma_wkup          (dma_wkup),             // ASIC ONLY: DMA Sub-System Wake-up (asynchronous and non-glitchy)

    .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)

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

    .scan_mode         (scan_mode),            // ASIC ONLY: Scan mode

    .wkup              (|wkup_in)              // ASIC ONLY: System Wake-up (asynchronous)

);

//

// Digital I/O

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

`ifdef CVER

omsp_gpio #(1,

            1,

            1,

            1,

            1,

            1)         gpio_0 (

`else

omsp_gpio #(.P1_EN(1),

            .P2_EN(1),

            .P3_EN(1),

            .P4_EN(1),

            .P5_EN(1),

            .P6_EN(1)) gpio_0 (

`endif

// 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           (p4_dout),              // Port 4 data output

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

    .p4_sel            (p4_sel),               // Port 4 function select

    .p5_dout           (p5_dout),              // Port 5 data output

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

    .p5_sel            (p5_sel),               // Port 5 function select

    .p6_dout           (p6_dout),              // Port 6 data output

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

    .p6_sel            (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            (p4_din),               // Port 4 data input

    .p5_din            (p5_din),               // Port 5 data input

    .p6_din            (p6_din),               // 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

);

//

// Timers

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

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_timerA),      // 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[`IRQ_NR-7]),   // 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 compare 0 input A

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

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

    .ta_cci1b          (ta_cci1b),             // Timer A compare 1 input B

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

    .ta_cci2b          (ta_cci2b),             // Timer A compare 2 input B

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

);

//

// Peripheral templates

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

template_periph_8b template_periph_8b_0 (

// OUTPUTs

    .per_dout          (per_dout_temp_8b),     // 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

);

`ifdef CVER

template_periph_16b #(15'h0190)                                        template_periph_16b_0 (

`else

template_periph_16b #(.BASE_ADDR((15'd`PER_SIZE-15'h0070) & 15'h7ff8)) template_periph_16b_0 (

`endif

// OUTPUTs

    .per_dout          (per_dout_temp_16b),    // 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

);

//

// Combine peripheral data bus

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

assign per_dout = per_dout_dio       |

                  per_dout_timerA    |

                  per_dout_temp_8b   |

                  per_dout_temp_16b;

//

// Map peripheral interrupts & wakeups

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

assign irq_in  = irq  | {1'b0,                 // Vector 13  (0xFFFA)

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

                         1'b0,                 // Vector 11  (0xFFF6)

                         1'b0,                 // Vector 10  (0xFFF4) - Watchdog -

                         irq_ta0,              // Vector  9  (0xFFF2)

                         irq_ta1,              // Vector  8  (0xFFF0)

                         1'b0,                 // Vector  7  (0xFFEE)

                         1'b0,                 // Vector  6  (0xFFEC)

                         1'b0,                 // Vector  5  (0xFFEA)

                         1'b0,                 // Vector  4  (0xFFE8)

                         irq_port2,            // Vector  3  (0xFFE6)

                         irq_port1,            // Vector  2  (0xFFE4)

                         1'b0,                 // Vector  1  (0xFFE2)

                         {`IRQ_NR-15{1'b0}}};  // Vector  0  (0xFFE0)

assign wkup_in = wkup | {1'b0,                 // Vector 13  (0xFFFA)

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

                         1'b0,                 // Vector 11  (0xFFF6)

                         1'b0,                 // Vector 10  (0xFFF4) - Watchdog -

                         1'b0,                 // Vector  9  (0xFFF2)

                         1'b0,                 // Vector  8  (0xFFF0)

                         1'b0,                 // Vector  7  (0xFFEE)

                         1'b0,                 // Vector  6  (0xFFEC)

                         1'b0,                 // Vector  5  (0xFFEA)

                         1'b0,                 // Vector  4  (0xFFE8)

                         1'b0,                 // Vector  3  (0xFFE6)

                         1'b0,                 // Vector  2  (0xFFE4)

                         1'b0,                 // Vector  1  (0xFFE2)

                         1'b0};                // Vector  0  (0xFFE0)

//

// I2C serial debug interface

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

// I2C Bus

//.........................

pullup dbg_scl_inst (dbg_scl);

pullup dbg_sda_inst (dbg_sda);

// I2C Slave (openMSP430)

//.........................

io_cell scl_slave_inst (

    .pad               (dbg_scl),              // I/O pad

    .data_in           (dbg_scl_slave),        // Input

    .data_out_en       (1'b0),                 // Output enable

    .data_out          (1'b0)                  // Output

);

io_cell sda_slave_inst (

    .pad               (dbg_sda),              // I/O pad

    .data_in           (dbg_sda_slave_in),     // Input

    .data_out_en       (!dbg_sda_slave_out),   // Output enable

    .data_out          (1'b0)                  // Output

);

// I2C Master (Debugger)

//.........................

io_cell scl_master_inst (

    .pad               (dbg_scl),              // I/O pad

    .data_in           (),                     // Input

    .data_out_en       (!dbg_scl_master),      // Output enable

    .data_out          (1'b0)                  // Output

);