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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: omsp_timerA.v

//

// *Module Description:

//                       Timer A top-level

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev$

// $LastChangedBy$

// $LastChangedDate$

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

`ifdef OMSP_TA_NO_INCLUDE

`else

`include "omsp_timerA_defines.v"

`endif

module  omsp_timerA (

// OUTPUTs

    irq_ta0,                        // Timer A interrupt: TACCR0

    irq_ta1,                        // Timer A interrupt: TAIV, TACCR1, TACCR2

    per_dout,                       // Peripheral data output

    ta_out0,                        // Timer A output 0

    ta_out0_en,                     // Timer A output 0 enable

    ta_out1,                        // Timer A output 1

    ta_out1_en,                     // Timer A output 1 enable

    ta_out2,                        // Timer A output 2

    ta_out2_en,                     // Timer A output 2 enable

// INPUTs

    aclk_en,                        // ACLK enable (from CPU)

    dbg_freeze,                     // Freeze Timer A counter

    inclk,                          // INCLK external timer clock (SLOW)

    irq_ta0_acc,                    // Interrupt request TACCR0 accepted

    mclk,                           // Main system clock

    per_addr,                       // Peripheral address

    per_din,                        // Peripheral data input

    per_en,                         // Peripheral enable (high active)

    per_we,                         // Peripheral write enable (high active)

    puc_rst,                        // Main system reset

    smclk_en,                       // SMCLK enable (from CPU)

    ta_cci0a,                       // Timer A capture 0 input A

    ta_cci0b,                       // Timer A capture 0 input B

    ta_cci1a,                       // Timer A capture 1 input A

    ta_cci1b,                       // Timer A capture 1 input B

    ta_cci2a,                       // Timer A capture 2 input A

    ta_cci2b,                       // Timer A capture 2 input B

    taclk                           // TACLK external timer clock (SLOW)

);

// OUTPUTs

//=========

output              irq_ta0;        // Timer A interrupt: TACCR0

output              irq_ta1;        // Timer A interrupt: TAIV, TACCR1, TACCR2

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

output              ta_out0;        // Timer A output 0

output              ta_out0_en;     // Timer A output 0 enable

output              ta_out1;        // Timer A output 1

output              ta_out1_en;     // Timer A output 1 enable

output              ta_out2;        // Timer A output 2

output              ta_out2_en;     // Timer A output 2 enable

// INPUTs

//=========

input               aclk_en;        // ACLK enable (from CPU)

input               dbg_freeze;     // Freeze Timer A counter

input               inclk;          // INCLK external timer clock (SLOW)

input               irq_ta0_acc;    // Interrupt request TACCR0 accepted

input               mclk;           // Main system clock

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

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

input               per_en;         // Peripheral enable (high active)

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

input               puc_rst;        // Main system reset

input               smclk_en;       // SMCLK enable (from CPU)

input               ta_cci0a;       // Timer A capture 0 input A

input               ta_cci0b;       // Timer A capture 0 input B

input               ta_cci1a;       // Timer A capture 1 input A

input               ta_cci1b;       // Timer A capture 1 input B

input               ta_cci2a;       // Timer A capture 2 input A

input               ta_cci2b;       // Timer A capture 2 input B

input               taclk;          // TACLK external timer clock (SLOW)

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

// 1)  PARAMETER DECLARATION

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

// Register base address (must be aligned to decoder bit width)

parameter       [14:0] BASE_ADDR  = 15'h0100;

// Decoder bit width (defines how many bits are considered for address decoding)

parameter              DEC_WD     =  7;

// Register addresses offset

parameter [DEC_WD-1:0] TACTL      = 'h60,

                       TAR        = 'h70,

                       TACCTL0    = 'h62,

                       TACCR0     = 'h72,

                       TACCTL1    = 'h64,

                       TACCR1     = 'h74,

                       TACCTL2    = 'h66,

                       TACCR2     = 'h76,

                       TAIV       = 'h2E;

// Register one-hot decoder utilities

parameter              DEC_SZ     =  (1 << DEC_WD);

parameter [DEC_SZ-1:0] BASE_REG   =  {{DEC_SZ-1{1'b0}}, 1'b1};

// Register one-hot decoder

parameter [DEC_SZ-1:0] TACTL_D    = (BASE_REG << TACTL),

                       TAR_D      = (BASE_REG << TAR),

                       TACCTL0_D  = (BASE_REG << TACCTL0),

                       TACCR0_D   = (BASE_REG << TACCR0),

                       TACCTL1_D  = (BASE_REG << TACCTL1),

                       TACCR1_D   = (BASE_REG << TACCR1),

                       TACCTL2_D  = (BASE_REG << TACCTL2),

                       TACCR2_D   = (BASE_REG << TACCR2),

                       TAIV_D     = (BASE_REG << TAIV);

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

// 2)  REGISTER DECODER

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

// Local register selection

wire              reg_sel   =  per_en & (per_addr[13:DEC_WD-1]==BASE_ADDR[14:DEC_WD]);

// Register local address

wire [DEC_WD-1:0] reg_addr  =  {per_addr[DEC_WD-2:0], 1'b0};

// Register address decode

wire [DEC_SZ-1:0] reg_dec   =  (TACTL_D    &  {DEC_SZ{(reg_addr == TACTL   )}})  |

                               (TAR_D      &  {DEC_SZ{(reg_addr == TAR     )}})  |

                               (TACCTL0_D  &  {DEC_SZ{(reg_addr == TACCTL0 )}})  |

                               (TACCR0_D   &  {DEC_SZ{(reg_addr == TACCR0  )}})  |

                               (TACCTL1_D  &  {DEC_SZ{(reg_addr == TACCTL1 )}})  |

                               (TACCR1_D   &  {DEC_SZ{(reg_addr == TACCR1  )}})  |

                               (TACCTL2_D  &  {DEC_SZ{(reg_addr == TACCTL2 )}})  |

                               (TACCR2_D   &  {DEC_SZ{(reg_addr == TACCR2  )}})  |

                               (TAIV_D     &  {DEC_SZ{(reg_addr == TAIV    )}});

// Read/Write probes

wire              reg_write =  |per_we & reg_sel;

wire              reg_read  = ~|per_we & reg_sel;

// Read/Write vectors

wire [DEC_SZ-1:0] reg_wr    = reg_dec & {512{reg_write}};

wire [DEC_SZ-1:0] reg_rd    = reg_dec & {512{reg_read}};

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

// 3) REGISTERS

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

// TACTL Register

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

reg   [9:0] tactl;

wire        tactl_wr = reg_wr[TACTL];

wire        taclr    = tactl_wr & per_din[`TACLR];

wire        taifg_set;

wire        taifg_clr;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)       tactl <=  10'h000;

  else if (tactl_wr) tactl <=  ((per_din[9:0] & 10'h3f3) | {9'h000, taifg_set}) & {9'h1ff, ~taifg_clr};

  else               tactl <=  (tactl                    | {9'h000, taifg_set}) & {9'h1ff, ~taifg_clr};

// TAR Register

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

reg  [15:0] tar;

wire        tar_wr = reg_wr[TAR];

wire        tar_clk;

wire        tar_clr;

wire        tar_inc;

wire        tar_dec;

wire [15:0] tar_add  = tar_inc ? 16'h0001 :

                       tar_dec ? 16'hffff : 16'h0000;

wire [15:0] tar_nxt  = tar_clr ? 16'h0000 : (tar+tar_add);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                     tar <=  16'h0000;

  else if  (tar_wr)                tar <=  per_din;

  else if  (taclr)                 tar <=  16'h0000;

  else if  (tar_clk & ~dbg_freeze) tar <=  tar_nxt;

// TACCTL0 Register

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

reg  [15:0] tacctl0;

wire        tacctl0_wr = reg_wr[TACCTL0];

wire        ccifg0_set;

wire        cov0_set;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)         tacctl0  <=  16'h0000;

  else if (tacctl0_wr) tacctl0  <=  ((per_din & 16'hf9f7) | {14'h0000, cov0_set, ccifg0_set}) & {15'h7fff, ~irq_ta0_acc};

  else                 tacctl0  <=  (tacctl0              | {14'h0000, cov0_set, ccifg0_set}) & {15'h7fff, ~irq_ta0_acc};

wire        cci0;

wire        cci0_s;

reg         scci0;

wire [15:0] tacctl0_full = tacctl0 | {5'h00, scci0, 6'h00, cci0_s, 3'h0};

// TACCR0 Register

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

reg  [15:0] taccr0;

wire        taccr0_wr = reg_wr[TACCR0];

wire        cci0_cap;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)        taccr0 <=  16'h0000;

  else if (taccr0_wr) taccr0 <=  per_din;

  else if (cci0_cap)  taccr0 <=  tar;

// TACCTL1 Register

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

reg  [15:0] tacctl1;

wire        tacctl1_wr = reg_wr[TACCTL1];

wire        ccifg1_set;

wire        ccifg1_clr;

wire        cov1_set;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)         tacctl1 <=  16'h0000;

  else if (tacctl1_wr) tacctl1 <=  ((per_din & 16'hf9f7) | {14'h0000, cov1_set, ccifg1_set}) & {15'h7fff, ~ccifg1_clr};

  else                 tacctl1 <=  (tacctl1              | {14'h0000, cov1_set, ccifg1_set}) & {15'h7fff, ~ccifg1_clr};

wire        cci1;

wire        cci1_s;

reg         scci1;

wire [15:0] tacctl1_full = tacctl1 | {5'h00, scci1, 6'h00, cci1_s, 3'h0};

// TACCR1 Register

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

reg  [15:0] taccr1;

wire        taccr1_wr = reg_wr[TACCR1];

wire        cci1_cap;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)        taccr1 <=  16'h0000;

  else if (taccr1_wr) taccr1 <=  per_din;

  else if (cci1_cap)  taccr1 <=  tar;

// TACCTL2 Register

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

reg  [15:0] tacctl2;

wire        tacctl2_wr = reg_wr[TACCTL2];

wire        ccifg2_set;

wire        ccifg2_clr;

wire        cov2_set;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)         tacctl2 <=  16'h0000;

  else if (tacctl2_wr) tacctl2 <=  ((per_din & 16'hf9f7) | {14'h0000, cov2_set, ccifg2_set}) & {15'h7fff, ~ccifg2_clr};

  else                 tacctl2 <=  (tacctl2              | {14'h0000, cov2_set, ccifg2_set}) & {15'h7fff, ~ccifg2_clr};

wire        cci2;

wire        cci2_s;

reg         scci2;

wire [15:0] tacctl2_full = tacctl2 | {5'h00, scci2, 6'h00, cci2_s, 3'h0};

// TACCR2 Register

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

reg  [15:0] taccr2;

wire        taccr2_wr = reg_wr[TACCR2];

wire        cci2_cap;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)        taccr2 <=  16'h0000;

  else if (taccr2_wr) taccr2 <=  per_din;

  else if (cci2_cap)  taccr2 <=  tar;

// TAIV Register

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

wire [3:0] taiv = (tacctl1[`TACCIFG] & tacctl1[`TACCIE]) ? 4'h2 :

                  (tacctl2[`TACCIFG] & tacctl2[`TACCIE]) ? 4'h4 :

                  (tactl[`TAIFG]     & tactl[`TAIE])     ? 4'hA :

                                                           4'h0;

assign     ccifg1_clr = (reg_rd[TAIV] | reg_wr[TAIV]) & (taiv==4'h2);

assign     ccifg2_clr = (reg_rd[TAIV] | reg_wr[TAIV]) & (taiv==4'h4);

assign     taifg_clr  = (reg_rd[TAIV] | reg_wr[TAIV]) & (taiv==4'hA);

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

// 4) DATA OUTPUT GENERATION

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

// Data output mux

wire [15:0] tactl_rd   = {6'h00, tactl}  & {16{reg_rd[TACTL]}};

wire [15:0] tar_rd     = tar             & {16{reg_rd[TAR]}};

wire [15:0] tacctl0_rd = tacctl0_full    & {16{reg_rd[TACCTL0]}};

wire [15:0] taccr0_rd  = taccr0          & {16{reg_rd[TACCR0]}};

wire [15:0] tacctl1_rd = tacctl1_full    & {16{reg_rd[TACCTL1]}};

wire [15:0] taccr1_rd  = taccr1          & {16{reg_rd[TACCR1]}};

wire [15:0] tacctl2_rd = tacctl2_full    & {16{reg_rd[TACCTL2]}};

wire [15:0] taccr2_rd  = taccr2          & {16{reg_rd[TACCR2]}};

wire [15:0] taiv_rd    = {12'h000, taiv} & {16{reg_rd[TAIV]}};

wire [15:0] per_dout   =  tactl_rd   |

                          tar_rd     |

                          tacctl0_rd |

                          taccr0_rd  |

                          tacctl1_rd |

                          taccr1_rd  |

                          tacctl2_rd |

                          taccr2_rd  |

                          taiv_rd;

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

// 5) Timer A counter control

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

// Clock input synchronization (TACLK & INCLK)

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

wire taclk_s;

wire inclk_s;

omsp_sync_cell sync_cell_taclk (

    .data_out  (taclk_s),

    .data_in   (taclk),

    .clk       (mclk),

    .rst       (puc_rst)

);

omsp_sync_cell sync_cell_inclk (

    .data_out  (inclk_s),

    .data_in   (inclk),

    .clk       (mclk),

    .rst       (puc_rst)

);

// Clock edge detection (TACLK & INCLK)

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

reg  taclk_dly;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst) taclk_dly <=  1'b0;

  else         taclk_dly <=  taclk_s;

wire taclk_en = taclk_s & ~taclk_dly;

reg  inclk_dly;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst) inclk_dly <=  1'b0;

  else         inclk_dly <=  inclk_s;

wire inclk_en = inclk_s & ~inclk_dly;

// Timer clock input mux

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

wire sel_clk = (tactl[`TASSELx]==2'b00) ? taclk_en :

               (tactl[`TASSELx]==2'b01) ?  aclk_en :

               (tactl[`TASSELx]==2'b10) ? smclk_en : inclk_en;

// Generate update pluse for the counter (<=> divided clock)

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

reg [2:0] clk_div;

assign    tar_clk = sel_clk & ((tactl[`TAIDx]==2'b00) ?  1'b1         :

                               (tactl[`TAIDx]==2'b01) ?  clk_div[0]   :

                               (tactl[`TAIDx]==2'b10) ? &clk_div[1:0] :

                                                        &clk_div[2:0]);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                               clk_div <=  3'h0;

  else if  (tar_clk | taclr)                 clk_div <=  3'h0;

  else if ((tactl[`TAMCx]!=2'b00) & sel_clk) clk_div <=  clk_div+3'h1;

// Time counter control signals

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

assign  tar_clr   = ((tactl[`TAMCx]==2'b01) & (tar>=taccr0))         |

                    ((tactl[`TAMCx]==2'b11) & (taccr0==16'h0000));

assign  tar_inc   =  (tactl[`TAMCx]==2'b01) | (tactl[`TAMCx]==2'b10) |

                    ((tactl[`TAMCx]==2'b11) & ~tar_dec);

reg tar_dir;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                        tar_dir <=  1'b0;

  else if (taclr)                     tar_dir <=  1'b0;

  else if (tactl[`TAMCx]==2'b11)

    begin

       if (tar_clk & (tar==16'h0001)) tar_dir <=  1'b0;

       else if       (tar>=taccr0)    tar_dir <=  1'b1;

    end

  else                                tar_dir <=  1'b0;

assign tar_dec = tar_dir | ((tactl[`TAMCx]==2'b11) & (tar>=taccr0));

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

// 6) Timer A comparator

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

wire equ0 = (tar_nxt==taccr0) & (tar!=taccr0);

wire equ1 = (tar_nxt==taccr1) & (tar!=taccr1);

wire equ2 = (tar_nxt==taccr2) & (tar!=taccr2);

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

// 7) Timer A capture logic

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

// Input selection

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

assign cci0 = (tacctl0[`TACCISx]==2'b00) ? ta_cci0a :

              (tacctl0[`TACCISx]==2'b01) ? ta_cci0b :

              (tacctl0[`TACCISx]==2'b10) ?     1'b0 : 1'b1;

assign cci1 = (tacctl1[`TACCISx]==2'b00) ? ta_cci1a :

              (tacctl1[`TACCISx]==2'b01) ? ta_cci1b :

              (tacctl1[`TACCISx]==2'b10) ?     1'b0 : 1'b1;

assign cci2 = (tacctl2[`TACCISx]==2'b00) ? ta_cci2a :

              (tacctl2[`TACCISx]==2'b01) ? ta_cci2b :

              (tacctl2[`TACCISx]==2'b10) ?     1'b0 : 1'b1;

// CCIx synchronization

omsp_sync_cell sync_cell_cci0 (

    .data_out (cci0_s),

    .data_in  (cci0),

    .clk      (mclk),

    .rst      (puc_rst)

);

omsp_sync_cell sync_cell_cci1 (

    .data_out (cci1_s),

    .data_in  (cci1),

    .clk      (mclk),

    .rst      (puc_rst)

);

omsp_sync_cell sync_cell_cci2 (

    .data_out (cci2_s),

    .data_in  (cci2),

    .clk      (mclk),

    .rst      (puc_rst)

);

// Register CCIx for edge detection

reg cci0_dly;

reg cci1_dly;

reg cci2_dly;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)

    begin

       cci0_dly <=  1'b0;

       cci1_dly <=  1'b0;

       cci2_dly <=  1'b0;

    end

  else

    begin

       cci0_dly <=  cci0_s;

       cci1_dly <=  cci1_s;

       cci2_dly <=  cci2_s;

    end

// Generate SCCIx

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

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             scci0 <=  1'b0;

  else if (tar_clk & equ0) scci0 <=  cci0_s;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             scci1 <=  1'b0;

  else if (tar_clk & equ1) scci1 <=  cci1_s;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             scci2 <=  1'b0;

  else if (tar_clk & equ2) scci2 <=  cci2_s;

// Capture mode

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

wire cci0_evt = (tacctl0[`TACMx]==2'b00) ? 1'b0                  :

                (tacctl0[`TACMx]==2'b01) ? ( cci0_s & ~cci0_dly) :   // Rising edge

                (tacctl0[`TACMx]==2'b10) ? (~cci0_s &  cci0_dly) :   // Falling edge

                                           ( cci0_s ^  cci0_dly);    // Both edges

wire cci1_evt = (tacctl1[`TACMx]==2'b00) ? 1'b0                  :

                (tacctl1[`TACMx]==2'b01) ? ( cci1_s & ~cci1_dly) :   // Rising edge

                (tacctl1[`TACMx]==2'b10) ? (~cci1_s &  cci1_dly) :   // Falling edge

                                           ( cci1_s ^  cci1_dly);    // Both edges

wire cci2_evt = (tacctl2[`TACMx]==2'b00) ? 1'b0                  :

                (tacctl2[`TACMx]==2'b01) ? ( cci2_s & ~cci2_dly) :   // Rising edge

                (tacctl2[`TACMx]==2'b10) ? (~cci2_s &  cci2_dly) :   // Falling edge

                                           ( cci2_s ^  cci2_dly);    // Both edges

// Event Synchronization

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

reg cci0_evt_s;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)       cci0_evt_s <=  1'b0;

  else if (tar_clk)  cci0_evt_s <=  1'b0;

  else if (cci0_evt) cci0_evt_s <=  1'b1;

reg cci1_evt_s;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)       cci1_evt_s <=  1'b0;

  else if (tar_clk)  cci1_evt_s <=  1'b0;

  else if (cci1_evt) cci1_evt_s <=  1'b1;

reg cci2_evt_s;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)       cci2_evt_s <=  1'b0;

  else if (tar_clk)  cci2_evt_s <=  1'b0;

  else if (cci2_evt) cci2_evt_s <=  1'b1;

reg cci0_sync;

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst) cci0_sync <=  1'b0;

  else         cci0_sync <=  (tar_clk & cci0_evt_s) | (tar_clk & cci0_evt & ~cci0_evt_s);