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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

//                      (targeting an Actel ProASIC3L).

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev: 37 $

// $LastChangedBy: olivier.girard $

// $LastChangedDate: 2009-12-29 21:58:14 +0100 (Tue, 29 Dec 2009) $

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

`include "openMSP430_defines.v"

module openMSP430_fpga (

// OUTPUTs

    din_x,                        // SPI Serial Data

    din_y,                        // SPI Serial Data

    led,                          // Board LEDs

    sclk_x,                       // SPI Serial Clock

    sclk_y,                       // SPI Serial Clock

    sync_n_x,                     // SPI Frame synchronization signal (low active)

    sync_n_y,                     // SPI Frame synchronization signal (low active)

    uart_tx,                      // Board UART TX pin

// INPUTs

    oscclk,                       // Board Oscillator (?? MHz)

    porst_n,                      // Board Power-On reset (active low)

    pbrst_n,                      // Board Push-Button reset (active low)

    uart_rx,                      // Board UART RX pin

    switch                        // Board Switches

);

// OUTPUTs

//=========

output              din_x;        // SPI Serial Data

output              din_y;        // SPI Serial Data

output        [9:0] led;          // Board LEDs

output              sclk_x;       // SPI Serial Clock

output              sclk_y;       // SPI Serial Clock

output              sync_n_x;     // SPI Frame synchronization signal (low active)

output              sync_n_y;     // SPI Frame synchronization signal (low active)

output              uart_tx;      // Board UART TX pin

// INPUTs

//=========

input               oscclk;       // Board Oscillator (?? MHz)

input               porst_n;      // Board Power-On reset (active low)

input               pbrst_n;      // Board Push-Button reset (active low)

input               uart_rx;      // Board UART RX pin

input         [9:0] switch;       // Board Switches

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

// 1)  INTERNAL WIRES/REGISTERS/PARAMETERS DECLARATION

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

wire  [`DMEM_MSB:0] dmem_addr;

wire                dmem_cen;

wire         [15:0] dmem_din;

wire          [1:0] dmem_wen;

wire         [15:0] dmem_dout;

wire  [`PMEM_MSB:0] pmem_addr;

wire                pmem_cen;

wire         [15:0] pmem_din;

wire          [1:0] pmem_wen;

wire         [15:0] pmem_dout;

wire          [7:0] per_addr;

wire         [15:0] per_din;

wire                per_en;

wire          [1:0] per_we;

wire         [15:0] per_dout;

wire         [13:0] irq_acc;

wire         [13:0] irq_bus;

wire                lfxt_clk;

wire                nmi;

wire                reset_n;

wire                dco_clk;

wire                mclk;

wire                puc;

wire          [7:0] p1_din;

wire          [7:0] p1_dout;

wire          [7:0] p1_dout_en;

wire          [7:0] p1_sel;

wire         [15:0] per_dout_dio;

wire         [15:0] per_dout_tA;

wire          [3:0] cntrl1;

wire          [3:0] cntrl2;

wire         [15:0] per_dout_dac_x;

wire         [15:0] per_dout_dac_y;

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

// 2)  PLL & CLOCK GENERATION

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

// Input clock buffer

PLLINT clk_in0 (.A(oscclk), .Y(oscclk_buf));

parameter  FCLKA  = 48.0;

parameter  M      = 7'd6;

parameter  N      = 7'd9;

parameter  U      = 5'd2;

parameter  V      = 5'd1;

parameter  W      = 5'd1;

parameter  FVCO   = FCLKA*M/N;  //  32 MHz

parameter  FGLA   = FVCO/U;     //  16 MHz

parameter  FGLB   = FVCO/V;     //  32 MHz

parameter  FGLC   = FVCO/W;     //  32 MHz

wire [4:0] oadiv  = U-5'h01;

wire [4:0] obdiv  = V-5'h01;

wire [4:0] ocdiv  = W-5'h01;

wire [6:0] findiv = N-7'h01;

wire [6:0] fbdiv  = M-7'h01;

PLL #(.VCOFREQUENCY(FVCO))  pll_0 (

// PLL Inputs

    .CLKA         (oscclk_buf),   // Reference Clock Input

    .EXTFB        (1'b0),         // External Feedback

    .POWERDOWN    (1'b1),         // Power-Down (active low)

// PLL Outputs

    .GLA          (dco_clk),      // Primary output

    .LOCK         (lock),         // PLL Lock Indicator

    .GLB          (glb),          // Secondary 1 output

    .YB           (yb),           // Core 1 output

    .GLC          (glc),          // Secondary 2 output

    .YC           (yc),           // Core 2 output

// GLA Configuration

    .OADIV0       (oadiv[0]),     // Primary output divider (divider is oadiv+1)

    .OADIV1       (oadiv[1]),

    .OADIV2       (oadiv[2]),

    .OADIV3       (oadiv[3]),

    .OADIV4       (oadiv[4]),

    .OAMUX0       (1'b0),         // Primary output select (selects from the VCO's four phases)

    .OAMUX1       (1'b0),

    .OAMUX2       (1'b1),

    .DLYGLA0      (1'b0),         // Primary output delay

    .DLYGLA1      (1'b0),

    .DLYGLA2      (1'b0),

    .DLYGLA3      (1'b0),

    .DLYGLA4      (1'b0),

// GLB/YB configuration

    .OBDIV0       (obdiv[0]),     // Secondary 1 output divider (divider is obdiv+1)

    .OBDIV1       (obdiv[1]),

    .OBDIV2       (obdiv[2]),

    .OBDIV3       (obdiv[3]),

    .OBDIV4       (obdiv[4]),

    .OBMUX0       (1'b1),         // Secondary 1 output select (selects from the VCO's four phases)

    .OBMUX1       (1'b0),

    .OBMUX2       (1'b1),

    .DLYYB0       (1'b0),         // Secondary 1 YB output delay

    .DLYYB1       (1'b0),

    .DLYYB2       (1'b0),

    .DLYYB3       (1'b0),

    .DLYYB4       (1'b0),

    .DLYGLB0      (1'b0),         // Secondary 1 GLB output delay

    .DLYGLB1      (1'b0),

    .DLYGLB2      (1'b0),

    .DLYGLB3      (1'b0),

    .DLYGLB4      (1'b0),

// GLC/YC configuration

    .OCDIV0       (ocdiv[0]),     // Secondary 2 output divider (divider is ocdiv+1)

    .OCDIV1       (ocdiv[1]),

    .OCDIV2       (ocdiv[2]),

    .OCDIV3       (ocdiv[3]),

    .OCDIV4       (ocdiv[4]),

    .OCMUX0       (1'b0),         // Secondary 2 output select (selects from the VCO's four phases)

    .OCMUX1       (1'b0),

    .OCMUX2       (1'b1),

    .DLYYC0       (1'b0),         // Secondary 2 YC output delay

    .DLYYC1       (1'b0),

    .DLYYC2       (1'b0),

    .DLYYC3       (1'b0),

    .DLYYC4       (1'b0),

    .DLYGLC0      (1'b0),         // Secondary 2 GLC output delay

    .DLYGLC1      (1'b0),

    .DLYGLC2      (1'b0),

    .DLYGLC3      (1'b0),

    .DLYGLC4      (1'b0),

// PLL Core configuration

    .FINDIV0      (findiv[0]),    // Input clock divider (divider is findiv+1)

    .FINDIV1      (findiv[1]),

    .FINDIV2      (findiv[2]),

    .FINDIV3      (findiv[3]),

    .FINDIV4      (findiv[4]),

    .FINDIV5      (findiv[5]),

    .FINDIV6      (findiv[6]),

    .FBDIV0       (fbdiv[0]),     // Feedback clock divider (divider is fbdiv+1)

    .FBDIV1       (fbdiv[1]),

    .FBDIV2       (fbdiv[2]),

    .FBDIV3       (fbdiv[3]),

    .FBDIV4       (fbdiv[4]),

    .FBDIV5       (fbdiv[5]),

    .FBDIV6       (fbdiv[6]),

    .FBDLY0       (1'b0),         // Feedback Delay

    .FBDLY1       (1'b0),

    .FBDLY2       (1'b0),

    .FBDLY3       (1'b0),

    .FBDLY4       (1'b0),

    .FBSEL0       (1'b1),         // Primary feedback delay select (0:no dly; 1:prog dly element; 2:external feedback)

    .FBSEL1       (1'b0),

    .XDLYSEL      (1'b0),         // System Delay Select (0: no dly; 1:inserts system dly)

    .VCOSEL0      (1'b1),         // PLL lock acquisition time (0: Fast with high tracking jitter; 1: Slow with low tracking jitter)

    .VCOSEL1      (1'b1),         // VCO gear control (see table below)

    .VCOSEL2      (1'b0)

);

//-------------+--------------------------------------------------------------+

//             |                           VCOSEL[2:1]                        |

//             |---------------+---------------+--------------+---------------|

//             |       00      |       01      |       10     |       11      |

//  VOLTAGE    |---------------+---------------+--------------+---------------|

//             |   Min.  Max.  |   Min.  Max.  |   Min.  Max. |   Min.  Max.  |

//             |  (MHz) (MHz)  |  (MHz) (MHz)  |  (MHz) (MHz) |  (MHz) (MHz)  |

//-------------+---------------+---------------+--------------+---------------|

// IGLOO and IGLOO PLUS                                                       |

//-------------+---------------+---------------+--------------+---------------|

// 1.2 V +- 5% |   24    35    |   30     70   |   60    140  |   135   160   |

// 1.5 V +- 5% |   24    43.75 |   30     87.5 |   60    175  |   135   250   |

//-------------+---------------+---------------+--------------+---------------|

// ProASIC3L, RT ProASIC3, and Military ProASIC3/L                            |

//-------------+---------------+---------------+--------------+---------------|

// 1.2 V +- 5% |   24    35    |    30    70   |   60    140  |   135   250   |

// 1.5 V +- 5% |   24    43.75 |    30    70   |   60    175  |   135   350   |

//-------------+---------------+---------------+--------------+---------------|

// ProASIC3 and Fusion                                                        |

//-------------+---------------+---------------+--------------+---------------|

// 1.5 V +- 5% |   24    43.75 |    33.75 87.5 |  67.5   175  |   135   350   |

//-------------+---------------+---------------+--------------+---------------+

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

// 3)  PROGRAM AND DATA MEMORIES

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

dmem_128B dmem_hi (.WD(dmem_din[15:8]), .RD(dmem_dout[15:8]), .WEN(dmem_wen[1] | dmem_cen), .REN(~dmem_wen[1] | dmem_cen), .WADDR(dmem_addr) , .RADDR(dmem_addr), .RWCLK(mclk), .RESET(~puc));

dmem_128B dmem_lo (.WD(dmem_din[7:0]),  .RD(dmem_dout[7:0]),  .WEN(dmem_wen[0] | dmem_cen), .REN(~dmem_wen[0] | dmem_cen), .WADDR(dmem_addr) , .RADDR(dmem_addr), .RWCLK(mclk), .RESET(~puc));

pmem_2kB  pmem_hi (.WD(pmem_din[15:8]), .RD(pmem_dout[15:8]), .WEN(pmem_wen[1] | pmem_cen), .REN(~pmem_wen[1] | pmem_cen), .WADDR(pmem_addr) , .RADDR(pmem_addr), .RWCLK(mclk), .RESET(~puc));

pmem_2kB  pmem_lo (.WD(pmem_din[7:0]),  .RD(pmem_dout[7:0]),  .WEN(pmem_wen[0] | pmem_cen), .REN(~pmem_wen[0] | pmem_cen), .WADDR(pmem_addr) , .RADDR(pmem_addr), .RWCLK(mclk), .RESET(~puc));

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

// 4)  OPENMSP430

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

openMSP430 openMSP430_0 (

// OUTPUTs

    .aclk_en      (aclk_en),      // ACLK enable

    .dbg_freeze   (dbg_freeze),   // Freeze peripherals

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

    .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)

    .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          (puc),          // Main system reset

    .smclk_en     (smclk_en),     // SMCLK enable

// INPUTs

    .cpu_en       (1'b1),         // Enable CPU code execution (asynchronous)

    .dbg_en       (1'b1),         // Debug interface enable (asynchronous)

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

    .dco_clk      (dco_clk),      // 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)

);

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

// 5)  OPENMSP430 PERIPHERALS

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

//

// SPI Interface for the 12 bit DACs

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

dac_spi_if #(1, 9'h190) dac_spi_if_x (

// OUTPUTs

    .cntrl1       (cntrl1),         // Control value 1

    .cntrl2       (cntrl2),         // Control value 2

    .din          (din_x),          // SPI Serial Data

    .per_dout     (per_dout_dac_x), // Peripheral data output

    .sclk         (sclk_x),         // SPI Serial Clock

    .sync_n       (sync_n_x),       // SPI Frame synchronization signal (low active)

// 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          (puc)             // Main system reset

);

dac_spi_if #(1, 9'h1A0) dac_spi_if_y (

// OUTPUTs

    .cntrl1       (),               // Control value 1

    .cntrl2       (),               // Control value 2

    .din          (din_y),          // SPI Serial Data

    .per_dout     (per_dout_dac_y), // Peripheral data output

    .sclk         (sclk_y),         // SPI Serial Clock

    .sync_n       (sync_n_y),       // SPI Frame synchronization signal (low active)

// 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          (puc)             // Main system reset

);

//

// Digital I/O

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

omsp_gpio #(.P1_EN(1),

            .P2_EN(0),

            .P3_EN(0),

            .P4_EN(0),

            .P5_EN(0),

            .P6_EN(0)) gpio_0 (

// OUTPUTs

    .irq_port1    (irq_port1),     // Port 1 interrupt

    .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      (),              // Port 2 data output

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

    .p2_sel       (),              // Port 2 function select

    .p3_dout      (),              // Port 3 data output

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

    .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       (8'h00),         // Port 2 data input

    .p3_din       (8'h00),         // 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          (puc)            // 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        (1'b0),          // 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          (puc),           // Main system reset

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

    .ta_cci0a     (1'b0),          // Timer A capture 0 input A

    .ta_cci0b     (1'b0),          // Timer A capture 0 input B

    .ta_cci1a     (1'b0),          // Timer A capture 1 input A

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

    .ta_cci2a     (1'b0),          // Timer A capture 2 input A

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

    .taclk        (1'b0)           // TACLK external timer clock (SLOW)

);

//

// Combine peripheral data buses

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

assign per_dout = per_dout_dio   |

                  per_dout_tA    |

                  per_dout_dac_x |

                  per_dout_dac_y;

//

// Assign interrupts

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

assign nmi        =  1'b0;

assign irq_bus    = {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)

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

                     irq_port1,    // Vector  2  (0xFFE4)

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

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

//

// Diverse

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

assign  reset_n =  (porst_n & pbrst_n);

assign  p1_din  =  8'h00;

assign  led     =  {cntrl1, p1_dout[0], p1_dout[0], cntrl2};

endmodule // openMSP430_fpga