sens_hispi12l4.v 17.2 KB
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/*******************************************************************************
 * Module: sens_hispi12l4
 * Date:2015-10-13  
 * Author: andrey     
 * Description: Decode HiSPi 4-lane, 12 bits Packetized-SP data from the sensor
 *
 * Copyright (c) 2015 Elphel, Inc .
 * sens_hispi12l4.v is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 *  sens_hispi12l4.v 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/> .
 *******************************************************************************/
`timescale 1ns/1ps

module  sens_hispi12l4#(
    parameter IODELAY_GRP =               "IODELAY_SENSOR",
    parameter integer IDELAY_VALUE =       0,
    parameter real REFCLK_FREQUENCY =      200.0,
    parameter HIGH_PERFORMANCE_MODE =     "FALSE",
    parameter SENS_PHASE_WIDTH=            8,      // number of bits for te phase counter (depends on divisors)
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//    parameter SENS_PCLK_PERIOD =           3.000,  // input period in ns, 0..100.000 - MANDATORY, resolution down to 1 ps
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    parameter SENS_BANDWIDTH =             "OPTIMIZED",  //"OPTIMIZED", "HIGH","LOW"

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    parameter CLKIN_PERIOD_SENSOR =        3.000, // input period in ns, 0..100.000 - MANDATORY, resolution down to 1 ps
    parameter CLKFBOUT_MULT_SENSOR =       3,      // 330 MHz --> 990 MHz
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    parameter CLKFBOUT_PHASE_SENSOR =      0.000,  // CLOCK FEEDBACK phase in degrees (3 significant digits, -360.000...+360.000)
    parameter IPCLK_PHASE =                0.000,
    parameter IPCLK2X_PHASE =              0.000,
    parameter BUF_IPCLK =                 "BUFR",
    parameter BUF_IPCLK2X =               "BUFR",  

    parameter SENS_DIVCLK_DIVIDE =         1,            // Integer 1..106. Divides all outputs with respect to CLKIN
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    parameter SENS_REF_JITTER1   =         0.010,        // Expected jitter on CLKIN1 (0.000..0.999)
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    parameter SENS_REF_JITTER2   =         0.010,
    parameter SENS_SS_EN         =        "FALSE",      // Enables Spread Spectrum mode
    parameter SENS_SS_MODE       =        "CENTER_HIGH",//"CENTER_HIGH","CENTER_LOW","DOWN_HIGH","DOWN_LOW"
    parameter SENS_SS_MOD_PERIOD =         10000,        // integer 4000-40000 - SS modulation period in ns

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    parameter HISPI_MSB_FIRST =            0,
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    parameter HISPI_NUMLANES =             4,
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    parameter HISPI_DELAY_CLK =           "FALSE",      
    parameter HISPI_MMCM =                "TRUE",
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    parameter HISPI_CAPACITANCE =         "DONT_CARE",
    parameter HISPI_DIFF_TERM =           "TRUE",
    parameter HISPI_DQS_BIAS =            "TRUE",
    parameter HISPI_IBUF_DELAY_VALUE =    "0",
    parameter HISPI_IBUF_LOW_PWR =        "TRUE",
    parameter HISPI_IFD_DELAY_VALUE =     "AUTO",
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    parameter HISPI_IOSTANDARD =          "DIFF_SSTL18_I", //"DIFF_SSTL18_II" for high current (13.4mA vs 8mA),
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    parameter HISPI_KEEP_IRST =           5 // number of cycles to keep irst on after release of prst (small number - use 1 hot)
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)(
    input             pclk,   // global clock input, pixel rate (220MHz for MT9F002)
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    input             prst,   // reset @pclk (add sensor reset here)
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    // I/O pads
    input [HISPI_NUMLANES-1:0] sns_dp,
    input [HISPI_NUMLANES-1:0] sns_dn,
    input                      sns_clkp,
    input                      sns_clkn,
    // output
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//    output reg          [11:0] pxd_out,
    output              [11:0] pxd_out,
//    output reg                 vact_out, 
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    output                     hact_out,
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    output                     sof, // @pclk
    output reg                 eof, // @pclk
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    // delay control inputs
    input                           mclk,
    input                           mrst,
    input  [HISPI_NUMLANES * 8-1:0] dly_data,        // delay value (3 LSB - fine delay) - @posedge mclk
    input      [HISPI_NUMLANES-1:0] set_idelay,      // mclk synchronous load idelay value
    input                           ld_idelay,       // mclk synchronous set idealy value
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    input                           set_clk_phase,   // mclk synchronous set idealy value
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    input                           rst_mmcm,
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    input                           ignore_embedded, // ignore lines with embedded data
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//    input                           wait_all_lanes,  // when 0 allow some lanes missing sync (for easier phase adjustment)
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    // MMCP output status
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    output                         ps_rdy,          // output
    output                   [7:0] ps_out,          // output[7:0] reg 
    output                         locked_pxd_mmcm,
    output                         clkin_pxd_stopped_mmcm, // output
    output                         clkfb_pxd_stopped_mmcm // output
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);
    wire                          ipclk;  // re-generated half HiSPi clock (165 MHz) 
    wire                          ipclk2x;// re-generated HiSPi clock (330 MHz)
    wire [HISPI_NUMLANES * 4-1:0] sns_d;
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    localparam WAIT_ALL_LANES = 4'h8; // number of output pixel cycles to wait after the earliest lane
    localparam FIFO_DEPTH = 4;
    reg      [HISPI_KEEP_IRST-1:0] irst_r;
    wire                         irst = irst_r[0];
    
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    sens_hispi_clock #(
        .SENS_PHASE_WIDTH       (SENS_PHASE_WIDTH),
        .SENS_BANDWIDTH         (SENS_BANDWIDTH),
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        .CLKIN_PERIOD_SENSOR    (CLKIN_PERIOD_SENSOR),
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        .CLKFBOUT_MULT_SENSOR   (CLKFBOUT_MULT_SENSOR),
        .CLKFBOUT_PHASE_SENSOR  (CLKFBOUT_PHASE_SENSOR),
        .IPCLK_PHASE            (IPCLK_PHASE),
        .IPCLK2X_PHASE          (IPCLK2X_PHASE),
        .BUF_IPCLK              (BUF_IPCLK),
        .BUF_IPCLK2X            (BUF_IPCLK2X),
        .SENS_DIVCLK_DIVIDE     (SENS_DIVCLK_DIVIDE),
        .SENS_REF_JITTER1       (SENS_REF_JITTER1),
        .SENS_REF_JITTER2       (SENS_REF_JITTER2),
        .SENS_SS_EN             (SENS_SS_EN),
        .SENS_SS_MODE           (SENS_SS_MODE),
        .SENS_SS_MOD_PERIOD     (SENS_SS_MOD_PERIOD),
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        .IODELAY_GRP            (IODELAY_GRP),
        .IDELAY_VALUE           (IDELAY_VALUE),
        .REFCLK_FREQUENCY       (REFCLK_FREQUENCY),
        .HIGH_PERFORMANCE_MODE  (HIGH_PERFORMANCE_MODE),

        .HISPI_DELAY_CLK        (HISPI_DELAY_CLK),
        .HISPI_MMCM             (HISPI_MMCM),
        
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        .HISPI_CAPACITANCE      (HISPI_CAPACITANCE),
        .HISPI_DIFF_TERM        (HISPI_DIFF_TERM),
        .HISPI_DQS_BIAS         (HISPI_DQS_BIAS),
        .HISPI_IBUF_DELAY_VALUE (HISPI_IBUF_DELAY_VALUE),
        .HISPI_IBUF_LOW_PWR     (HISPI_IBUF_LOW_PWR),
        .HISPI_IFD_DELAY_VALUE  (HISPI_IFD_DELAY_VALUE),
        .HISPI_IOSTANDARD       (HISPI_IOSTANDARD)
    ) sens_hispi_clock_i (
        .mclk                   (mclk),                   // input
        .mrst                   (mrst),                   // input
        .phase                  (dly_data[7:0]),          // input[7:0] 
        .set_phase              (set_clk_phase),          // input
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        .load                   (ld_idelay),              // input
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        .rst_mmcm               (rst_mmcm),               // input
        .clp_p                  (sns_clkp),               // input
        .clk_n                  (sns_clkn),               // input
        .ipclk                  (ipclk),                  // output
        .ipclk2x                (ipclk2x),                // output
        .ps_rdy                 (ps_rdy),                 // output
        .ps_out                 (ps_out),                 // output[7:0] 
        .locked_pxd_mmcm        (locked_pxd_mmcm),        // output
        .clkin_pxd_stopped_mmcm (clkin_pxd_stopped_mmcm), // output
        .clkfb_pxd_stopped_mmcm (clkfb_pxd_stopped_mmcm)  // output
    );

    sens_hispi_din #(
        .IODELAY_GRP            (IODELAY_GRP),
        .IDELAY_VALUE           (IDELAY_VALUE),
        .REFCLK_FREQUENCY       (REFCLK_FREQUENCY),
        .HIGH_PERFORMANCE_MODE  (HIGH_PERFORMANCE_MODE),
        .HISPI_NUMLANES         (HISPI_NUMLANES),
        .HISPI_CAPACITANCE      (HISPI_CAPACITANCE),
        .HISPI_DIFF_TERM        (HISPI_DIFF_TERM),
        .HISPI_DQS_BIAS         (HISPI_DQS_BIAS),
        .HISPI_IBUF_DELAY_VALUE (HISPI_IBUF_DELAY_VALUE),
        .HISPI_IBUF_LOW_PWR     (HISPI_IBUF_LOW_PWR),
        .HISPI_IFD_DELAY_VALUE  (HISPI_IFD_DELAY_VALUE),
        .HISPI_IOSTANDARD       (HISPI_IOSTANDARD)
    ) sens_hispi_din_i (
        .mclk         (mclk), // input
        .mrst         (mrst), // input
        .dly_data     (dly_data), // input[31:0] 
        .set_idelay   (set_idelay), // input[3:0] 
        .ld_idelay    (ld_idelay), // input
        .ipclk        (ipclk), // input
        .ipclk2x      (ipclk2x), // input
        .irst         (irst), // input
        .din_p        (sns_dp), // input[3:0] 
        .din_n        (sns_dn), // input[3:0] 
        .dout         (sns_d) // output[15:0] 
    );
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    wire [HISPI_NUMLANES * 12-1:0] hispi_aligned;
    wire      [HISPI_NUMLANES-1:0] hispi_dv;
    wire      [HISPI_NUMLANES-1:0] hispi_embed;
    wire      [HISPI_NUMLANES-1:0] hispi_sof;
    wire      [HISPI_NUMLANES-1:0] hispi_eof;
    wire      [HISPI_NUMLANES-1:0] hispi_sol;
    wire      [HISPI_NUMLANES-1:0] hispi_eol;
   // TODO - try to make that something will be recorded even if some lanes are bad (to simplify phase adjust
   // possibly - extra control bit (wait_all_lanes)
   //    use earliest SOF
    reg                             vact_ipclk;
    reg                       [1:0] vact_pclk_strt;
    wire       [HISPI_NUMLANES-1:0] rd_run;
    reg                             rd_line; // combine all lanes
    reg                             rd_line_r;
    wire                            sol_all_dly;
    reg        [HISPI_NUMLANES-1:0] rd_run_d;
    reg                             sof_pclk;
//    wire       [HISPI_NUMLANES-1:0] sol_pclk = rd_run & ~rd_run_d;
    wire                            sol_pclk = |(rd_run & ~rd_run_d); // possibly multi-cycle
    reg        [HISPI_NUMLANES-1:0] good_lanes; // lanes that started active line OK   
    reg        [HISPI_NUMLANES-1:0] fifo_re;
    reg        [HISPI_NUMLANES-1:0] fifo_re_r;
    reg                             hact_r;
    wire  [HISPI_NUMLANES * 12-1:0] fifo_out;
    wire                            hact_on;
    wire                            hact_off;
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    reg                             ignore_embedded_ipclk;
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    reg                       [1:0] vact_pclk;
    wire                     [11:0] pxd_out_pre = ({12 {fifo_re_r[0] & rd_run[0]}} & fifo_out[0 * 12 +:12]) |
                                                  ({12 {fifo_re_r[1] & rd_run[1]}} & fifo_out[1 * 12 +:12]) |
                                                  ({12 {fifo_re_r[2] & rd_run[2]}} & fifo_out[2 * 12 +:12]) |
                                                  ({12 {fifo_re_r[3] & rd_run[3]}} & fifo_out[3 * 12 +:12]);
       
    
    
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    assign hact_out = hact_r;
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    assign sof =      sof_pclk;
    
    // async reset
    always @ (posedge ipclk or posedge prst) begin
        if (prst) irst_r <= {HISPI_KEEP_IRST{1'b1}}; // HISPI_KEEP_IRST-1
        else      irst_r <= irst_r >> 1; 
    end
    
    
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    always @(posedge ipclk) begin
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//        irst_r <= {irst_r[1:0], prst};
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        if (irst || (|hispi_eof)) vact_ipclk <= 0; // extend output if hact active
        else if (|hispi_sof)      vact_ipclk <= 1;
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        ignore_embedded_ipclk <= ignore_embedded;
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    end
    
    always @(posedge pclk) begin
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    if (prst || !vact_ipclk) vact_pclk_strt <= 0;
    else                     vact_pclk_strt <= {vact_pclk_strt[0], 1'b1};
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        rd_run_d <= rd_run;
       
        sof_pclk <= vact_pclk_strt[0] && ! vact_pclk_strt[1];
       
        if      (prst || sof_pclk) rd_line <= 0;
        else if (sol_pclk)         rd_line <= 1;
        else                       rd_line <= rd_line & (&(~good_lanes | rd_run)); // Off when first of the good lanes goes off      
       
        rd_line_r <= rd_line;
        
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        if (sol_pclk && !rd_line) good_lanes <= ~rd_run_d;             // should be off before start
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        else if (sol_all_dly)     good_lanes <= good_lanes & rd_run; // and now they should be on
        
        fifo_re_r <= fifo_re & rd_run; // when data out is ready, mask if not running
        
        // not using HISPI_NUMLANES here - fix? Will be 0 (not possible in hispi) when no data
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/*        pxd_out <= ({12 {fifo_re_r[0] & rd_run[0]}} & fifo_out[0 * 12 +:12]) |
                   ({12 {fifo_re_r[1] & rd_run[1]}} & fifo_out[1 * 12 +:12]) |
                   ({12 {fifo_re_r[2] & rd_run[2]}} & fifo_out[2 * 12 +:12]) |
                   ({12 {fifo_re_r[3] & rd_run[3]}} & fifo_out[3 * 12 +:12]); */
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       if      (prst)                                                 fifo_re <= 0;
       else if (sol_pclk || (rd_line && fifo_re[HISPI_NUMLANES - 1])) fifo_re <= 1;
       else                                                           fifo_re <= fifo_re << 1;
       
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//       if (prst || (hact_off && (|(good_lanes & ~rd_run)))) hact_r <= 0;
       if (prst || (hact_off && (!rd_line || (good_lanes[3] & ~rd_run[3])))) hact_r <= 0;
       else if (hact_on)                                    hact_r <= 1;
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       vact_pclk <= {vact_pclk[0],vact_pclk_strt [0] || hact_r};
       eof <= vact_pclk[1] && !vact_pclk[0]; 
//       vact_out <= vact_pclk_strt [0] || hact_r;
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    end

    dly_16 #(
        .WIDTH(1)
    ) dly_16_start_line_i (
        .clk  (pclk),                  // input
        .rst  (1'b0),                  // input
        .dly  (WAIT_ALL_LANES),        // input[3:0] 
        .din  (rd_line && !rd_line_r), // input[0:0] 
        .dout (sol_all_dly)            // output[0:0] 
    );

    dly_16 #(
        .WIDTH(1)
    ) dly_16_hact_on_i (
        .clk  (pclk),                        // input
        .rst  (1'b0),                        // input
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//        .dly  (4'h2),                        // input[3:0] 
//        .dly  (4'h3),                        // input[3:0] 
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        .dly  (4'h1),                        // input[3:0] 
//        .dly  (4'h2),                        // input[3:0] 
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        .din  (sol_pclk),                    // input[0:0] 
        .dout (hact_on)                      // output[0:0] 
    );

    dly_16 #(
        .WIDTH(1)
    ) dly_16_hact_off_i (
        .clk  (pclk),                        // input
        .rst  (1'b0),                        // input
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//        .dly  (4'h2),                        // input[3:0] 
//        .dly  (4'h0),                        // input[3:0] 
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        .dly  (4'h1),                        // input[3:0] 
//        .dly  (4'h2),                        // input[3:0] 
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        .din  (fifo_re[HISPI_NUMLANES - 1]), // input[0:0] 
        .dout (hact_off)                     // output[0:0] 
    );
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    dly_16 #(
        .WIDTH(12)
    ) dly_16_pxd_out_i (
        .clk  (pclk),                        // input
        .rst  (1'b0),                        // input
//        .dly  (4'h2),                        // input[3:0] 
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        .dly  (4'h0),                        // input[3:0] 
//        .dly  (4'h1),                        // input[3:0] 
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        .din  (pxd_out_pre),                 // input[0:0] 
        .dout (pxd_out)                      // output[0:0] 
    );
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    generate
        genvar i;
        for (i=0; i < 4; i=i+1) begin: hispi_lane
            sens_hispi_lane #(
                .HISPI_MSB_FIRST(HISPI_MSB_FIRST)
            ) sens_hispi_lane_i (
                .ipclk    (ipclk),                     // input
                .irst     (irst),                      // input
                .din      (sns_d[4*i +: 4]),           // input[3:0] 
                .dout     (hispi_aligned[12*i +: 12]), // output[3:0] reg 
                .dv       (hispi_dv[i]),               // output reg 
                .embed    (hispi_embed[i]),            // output reg 
                .sof      (hispi_sof[i]),              // output reg 
                .eof      (hispi_eof[i]),              // output reg 
                .sol      (hispi_sol[i]),              // output reg 
                .eol      (hispi_eol[i])               // output reg 
            );
            sens_hispi_fifo #(
                .COUNT_START  (7),
                .DATA_WIDTH  (12),
                .DATA_DEPTH  (FIFO_DEPTH)
            ) sens_hispi_fifo_i (
                .ipclk    (ipclk),                     // input
                .irst     (irst),                      // input
                .we       (hispi_dv[i]),               // input
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                .sol      (hispi_sol[i] && !(hispi_embed[i] && ignore_embedded_ipclk)), // input
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                .eol      (hispi_eol[i]),              // input
                .din      (hispi_aligned[12*i +: 12]), // input[11:0] 
                .pclk     (pclk),                      // input
                .prst     (prst),                      // input
                .re       (fifo_re[i]),                // input
                .dout     (fifo_out[12*i +: 12]),      // output[11:0] reg 
                .run      (rd_run[i])                  // output
            );
        
        end
    endgenerate        
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endmodule