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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 Xilinx synthesis.

//

// *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 "timescale.v"

`include "openMSP430_defines.v"

module openMSP430_fpga (

// OUTPUTs

    aclk_en,                      // ACLK enable

    dbg_freeze,                   // Freeze peripherals

    dbg_uart_txd,                 // Debug interface: UART TXD

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

    per_addr,                     // Peripheral address

    per_din,                      // Peripheral data input

    per_wen,                      // Peripheral write enable (high active)

    per_en,                       // Peripheral enable (high active)

    smclk_en,                     // SMCLK enable

// INPUTs

    dbg_uart_rxd,                 // Debug interface: UART RXD

    dco_clk,                      // Fast oscillator (fast clock)

    irq,                          // Maskable interrupts

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

    nmi,                          // Non-maskable interrupt (asynchronous)

    per_dout,                     // Peripheral data output

    reset_n                       // Reset Pin (low active)

);

// OUTPUTs

//=========

output              aclk_en;      // ACLK enable

output              dbg_freeze;   // Freeze peripherals

output              dbg_uart_txd; // Debug interface: UART TXD

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

output        [7:0] per_addr;     // Peripheral address

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

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

output              per_en;       // Peripheral enable (high active)

output              smclk_en;     // SMCLK enable

// INPUTs

//=========

input               dbg_uart_rxd; // Debug interface: UART RXD

input               dco_clk;      // Fast oscillator (fast clock)

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               reset_n;      // Reset Pin (active low)

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

// 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                mclk;

wire                puc;

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

// 2)  PROGRAM AND DATA MEMORIES

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

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

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

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

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

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

// 3)  OPENMSP430

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

openMSP430 openMSP430_0 (

// OUTPUTs

    .aclk_en      (aclk_en),      // ACLK enable

    .dbg_freeze   (dbg_freeze),   // Freeze peripherals

    .dbg_uart_txd (dbg_uart_txd), // 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_wen      (per_wen),      // 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

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

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

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

    .irq          (irq),          // Maskable interrupts

    .lfxt_clk     (lfxt_clk),     // 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)

);

endmodule // openMSP430_fpga