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// $Id: x7_top.v 900 2015-04-23 03:09:36Z nxp20190 $

//

// @brief Sango X7 Main top.

//

// @Author Roger Williams <roger.williams@nxp.com>

//

// (c) 2015 NXP Semiconductors. All rights reserved.

//

// PROPRIETARY INFORMATION

//

// The information contained in this file is the property of NXP Semiconductors.

// Except as specifically authorized in writing by NXP, the holder of this file:

// (1) shall keep all information contained herein confidential and shall protect

// same in whole or in part from disclosure and dissemination to all third parties

// and (2) shall use same for operation and maintenance purposes only.

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

// 0.01.0  2015-04-16 (RAW) Initial entry

// 0.02.0  2015-04-18 (RAW) System clock, IO_UPDATE

// 0.03.0  2015-05-14 (RAW) Incorporated xdig HDL

// 0.04.0  2016-02-27 (JEC) Updated pin names to match Sango X7 schematic

//                          Added DDR3 and MMC interface pins

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

`include "version.v"

`include "timescale.v"

`include "registers_def.v"

module x7_main

  (

   // 100MHz clock from synthesiser

   input  wire FPGA_CLKP_i,

   input  wire FPGA_CLKN_i,

   // Asynchronous reset

   input  wire RESETN_i,

   // signals between MCU and FPGA

   output reg  MISO_o,

   input  wire MOSI_i,

   input  wire SCLK_i,

   input  wire SPI_SSN_i,

   input  wire FLASH_SEL_i,

   input  wire MCU_CLK_i, // currently unused

   // SPI to synthesiser

   input  wire SYN_MISO_i,

   output wire SYN_MOSI_o,

   output wire SYN_SCLK_o,

   output wire DDS_SSN_o,

   output wire RSYN_SSN_o,

   output wire FR_SSN_o,

   output wire MSYN_SSN_o,

   output wire MBW_SSN_o,

   // DDS interface

   output wire DDS_IORST_o,

   output reg  DDS_IOUP_o,

   input  wire DDS_SYNC_i,

   output wire [2:0] DDS_PS_o,

   // output module SPI interfaces

   input  wire [4:1] CH_MISO_i,

   output wire [4:1] CH_MOSI_o,

   output wire [4:1] CH_SCLK_o,

   output wire [4:1] CH_SSN_o,

   output wire [4:1] CH_GATE_o,

   output wire [4:1] BIASON_o,

   inout  wire [4:1] CH_CTRL1_io, // currently unused

   inout  wire [4:1] CH_CTRL0_io, // currently unused

   // interlocks, front panel

   input  wire EXT_UNLOCK_i,

   output wire RF_LED_GRN_o,

   output wire RF_LED_RED_o,

   // 667kHz switching regulator sync clock

   output wire PSYNC_o,

   // 24MHz clock output to USB hub XIN

   output wire USB_CLK_o, // currently unused

   // RF on signals

   output wire RF_IS_ON_o,

   input  wire RF_ON_i,

   // external interfaces

   input  wire SYNCINX_i, // Currently unused

   output reg  SYNCOUTX_o,

   // PA interfaces

   output wire [4:1] CONV_o,

   output wire [4:1] SCK_F_o,

   output wire [4:1] SCK_R_o,

   input  wire [4:1] SDO_F_i,

   input  wire [4:1] SDO_R_i,

   output wire [4:1] VBUS_EN_o,

   input  wire [4:1] TRIGX_i,

   // DDR3 interface

   output wire [14:0] A_o,

   output wire [2:0]  BA_o,

   inout  wire [15:0] DQ_i,

   output wire [1:0]  DM_o,

   output wire [1:0]  DQS_o,

   output wire [1:0]  DQSN_o,

   output wire        CSN_o,

   output wire        WEN_o,

   output wire        CASN_o,

   output wire        RASN_o,

   output wire        CK_o,

   output wire        CKN_o,

   output wire        CKE_o,

   output wire        ODT_o,

   // MMC interface (FPGA acts as MMC slave)

   inout  wire [7:0]  MMC_DAT_io,

   inout  wire        MMC_CMD_io,

   input  wire        MMC_CLK_i,

   output wire        MMC_IRQN_o

   );

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

   // FPGA_RST signal

   wire FPGA_RST;

   assign FPGA_RST = ~RESETN_i;

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

   // Drive values onto unused signals

   assign USB_CLK_o = 1'b0;

   assign MMC_IRQN_o = 1'b1;

   assign CONV_o = 0;

   assign VBUS_EN_o = 4'b1;

   assign A_o    =  15'b0;

   assign BA_o   =  3'b0;

   assign DQ_i   = 16'bZ;

   assign DM_o   =  2'b0;

   assign DQS_o  =  2'b0;

   assign DQSN_o =  2'b1;

   assign CSN_o  =  1'b1;

   assign WEN_o  =  1'b1;

   assign CASN_o =  1'b1;

   assign RASN_o =  1'b1;

   assign CK_o   =  1'b0;

   assign CKN_o  =  1'b1;

   assign CKE_o  =  1'b0;

   assign ODT_o  =  1'b0;

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

   // system clock generation

   wire    clkfb, clkin;

   (* keep = "true" *) wire   clk;   // 100MHz system clock

   (* keep = "true" *) wire   clk200; // 200MHz system clock

   (* keep = "true" *) wire  clk10;  // 10MHz clock

   IBUFGDS IBUFGDS_sysclk (.O(clkin),.I(FPGA_CLKP_i),.IB(FPGA_CLKN_i));

   MMCME2_BASE #(.CLKIN1_PERIOD(10.000),.CLKOUT0_DIVIDE_F(8.0),.CLKOUT1_DIVIDE(4.0),

     .CLKOUT4_DIVIDE(15),.CLKFBOUT_MULT_F(8),.CLKOUT6_DIVIDE(80),

     .CLKOUT4_CASCADE("TRUE"))

   MMCME2_BASE_sysclk (.CLKOUT0(clk),.CLKOUT1(clk200),.CLKOUT4(PSYNC_o),.CLKOUT6(clk10),

           .CLKFBOUT(clkfb),.CLKIN1(clkin),.CLKFBIN(clkfb));

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

   // simple interlock LED logic

   assign RF_IS_ON_o = RF_ON_i & ~EXT_UNLOCK_i;

   assign RF_LED_GRN_o = RF_IS_ON_o;

   assign RF_LED_RED_o = ~RF_IS_ON_o;

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

   // simple MCU to external SPI interface

   reg [5:0]   spi_addr = 6'b0;

   reg [3:0]   spi_count = 4'b0;

   reg         spi_data_valid = 1'b0;

   wire        fpga_miso;

   wire        spi_addr_valid = (spi_count >= 6);

   wire        spi_addr_done = (spi_count >= 8);

   wire        spi_sel = (FLASH_SEL_i & ~SPI_SSN_i);

   wire        fpga_ss;

   always @(posedge SCLK_i or negedge spi_sel) begin

      if (~spi_sel) begin

        spi_count <= 0;

        spi_addr <= 0;

      end

      else begin

        if (~spi_addr_done)

          spi_count <= spi_count + 1;

        if (~spi_addr_valid)

          spi_addr[5:0] <= {spi_addr[4:0], MOSI_i};

      end

   end

   always @(negedge SCLK_i or negedge spi_sel)

      if (~spi_sel)

        spi_data_valid <= 0;

      else if (spi_addr_done)

        spi_data_valid <= 1;

   // multiplex MCU SPI lines

   assign DDS_SSN_o = ~(spi_data_valid & (spi_addr == 6'h00));

   assign RSYN_SSN_o = ~(spi_data_valid & (spi_addr == 6'h01));

   assign FR_SSN_o = ~(spi_data_valid & (spi_addr == 6'h02));

   assign MSYN_SSN_o = ~(spi_data_valid & (spi_addr == 6'h03));

   assign MBW_SSN_o = ~(spi_data_valid & (spi_addr == 6'h04));

   assign fpga_ss = spi_data_valid & (spi_addr == 6'h10);

   assign CH_SSN_o[1] = ~(spi_data_valid & (spi_addr[5:3] == 3'b100));

   assign CH_SSN_o[2] = ~(spi_data_valid & (spi_addr[5:3] == 3'b101));

   assign CH_SSN_o[3] = ~(spi_data_valid & (spi_addr[5:3] == 3'b110));

   assign CH_SSN_o[4] = ~(spi_data_valid & (spi_addr[5:3] == 3'b111));

   assign SYN_MOSI_o = spi_data_valid & MOSI_i & (spi_addr[5:3] == 3'b000);

   assign CH_MOSI_o[1] = spi_data_valid & MOSI_i & (spi_addr[5:3] == 3'b100);

   assign CH_MOSI_o[2] = spi_data_valid & MOSI_i & (spi_addr[5:3] == 3'b101);

   assign CH_MOSI_o[3] = spi_data_valid & MOSI_i & (spi_addr[5:3] == 3'b110);

   assign CH_MOSI_o[4] = spi_data_valid & MOSI_i & (spi_addr[5:3] == 3'b111);

   assign SYN_SCLK_o = spi_data_valid & SCLK_i & (spi_addr[5:3] == 3'b000);

   assign CH_SCLK_o[1] = spi_data_valid & SCLK_i & (spi_addr[5:3] == 3'b100);

   assign CH_SCLK_o[2] = spi_data_valid & SCLK_i & (spi_addr[5:3] == 3'b101);

   assign CH_SCLK_o[3] = spi_data_valid & SCLK_i & (spi_addr[5:3] == 3'b110);

   assign CH_SCLK_o[4] = spi_data_valid & SCLK_i & (spi_addr[5:3] == 3'b111);

   always @*

      casex (spi_addr)

        6'b010000: MISO_o = spi_data_valid & fpga_miso;

        6'b000xxx: MISO_o = spi_data_valid & SYN_MISO_i;

        6'b100xxx: MISO_o = spi_data_valid & CH_MISO_i[1];

        6'b101xxx: MISO_o = spi_data_valid & CH_MISO_i[2];

        6'b110xxx: MISO_o = spi_data_valid & CH_MISO_i[3];

        6'b111xxx: MISO_o = spi_data_valid & CH_MISO_i[4];

        default: MISO_o = 1'b0;

      endcase

   // generate 2xDDS_SYNC_i tick I/O_UPDATE strobe at end of DDS SPI write

   reg    dds_ssn_dly = 1'b1;

   reg    dds_ssn_dly2 = 1'b1;

   reg     dds_ioup_dly = 1'b0;

   always @(posedge DDS_SYNC_i or posedge FPGA_RST) begin

     if (FPGA_RST) begin

       dds_ssn_dly <= 1'b0;

       dds_ssn_dly2 <= 1'b0;

       dds_ioup_dly <= 1'b0;

       DDS_IOUP_o <= 1'b0;

     end

     else begin

       dds_ssn_dly <= DDS_SSN_o;

       dds_ssn_dly2 <= dds_ssn_dly;

       dds_ioup_dly <= DDS_IOUP_o;

       if (dds_ssn_dly & ~dds_ssn_dly2)

         DDS_IOUP_o <= 1;

       else if (dds_ioup_dly)

         DDS_IOUP_o <= 0;

       end

     end

   // tie DDS interface to defaults for now

   assign DDS_IORST_o = 1'b0;

   assign DDS_PS_o = 3'b000;

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

   // SPI-to-register interface

   reg [3:0]   fpga_spacount = 3'b0;

   reg [3:0]   fpga_spdcount = 4'b0;

   reg [6:0]   fpga_spaddr = 7'b0;

   reg [15:0]   fpga_spdin = 16'b0;

   reg     fpga_spdin_valid = 1'b0;

   reg     fpga_sprw = 1'b0;

   reg [15:0]   fpga_spdout = 16'b0;

   reg     fpga_spdout_load = 1'b0;

   assign   fpga_miso = fpga_spdout[15];

   wire   fpga_spadone = (fpga_spacount >= 8);

   wire   fpga_spdin_last = (fpga_spdcount == 15);

   wire   fpga_spdout_first = fpga_spadone & (fpga_spdcount == 0);

   reg [15:0]   dat_o = 16'b0;

   // SPI MOSI_i in -> register write

   // MCU shifts MOSI_i on falling edge of SCLK_i, so sample it on rising edge

   always @(posedge SCLK_i or negedge fpga_ss) begin

      if (~fpga_ss) begin

        fpga_spacount <= 0;

        fpga_spdcount <= 0;

        fpga_spaddr <= 0;

        fpga_sprw <= 0;

        fpga_spdin_valid <= 0;

      end

      else begin

        if (fpga_spadone) begin

          // in data phase, generate write strobe for incoming data every 16th bit

          fpga_spdin_valid <= fpga_spdin_last;

          fpga_spdin[15:0] <= {fpga_spdin[14:0], MOSI_i};

          fpga_spdcount <= fpga_spdcount + 1;

        end

        else begin

          // still in address phase

          fpga_spacount <= fpga_spacount + 1;

          fpga_sprw <= fpga_spaddr[6];

          fpga_spaddr[6:0] <= {fpga_spaddr[5:0], MOSI_i};

        end

      end

   end

   // register read -> SPI MISO_o out

   // MCU samples MISO_o on rising edge of SCLK_i, so shift it on falling edge

   always @(negedge SCLK_i or posedge fpga_spdout_load)

      if (fpga_spdout_load)

   fpga_spdout <= dat_o;

      else if (fpga_spadone)

   fpga_spdout[15:0] <= {fpga_spdout[14:0], 1'b0};

   // reclock in 100MHz domain

   reg     we = 1'b0;

   reg     cs = 1'b0;

   reg     oe = 1'b0;

   reg [6:0]  adr = 7'b0;

   reg [15:0] dat = 16'b0;

   reg     fpga_spdin_valid_dly = 1'b0;

   reg     fpga_spdout_first_dly = 1'b0;

   reg     fpga_spdout_rd_dly = 1'b0;

   always @(posedge clk) begin

      cs <= fpga_spadone;

      adr <= fpga_spaddr;

      fpga_spdin_valid_dly <= fpga_spdin_valid;

      we <= fpga_spdin_valid & ~fpga_spdin_valid_dly;

      dat <= fpga_spdin;

      // generate 1-tick read strobe before next SCLK_i rising edge

      fpga_spdout_first_dly <= fpga_spdout_first;

      oe <= fpga_sprw & fpga_spdout_first & ~fpga_spdout_first_dly;

      fpga_spdout_load <= oe;

   end

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

   // code from xdig

   wire [`REG_BITS_R]   reg_r;

   wire [`REG_BITS_W]   reg_w;

   assign reg_r[`VERSION_INDEX] = `VERSION;

   wire [15:0]     stat;

   assign reg_r[`STAT_INDEX] = stat;

   wire [15:0]     irq;

   assign reg_r[`IRQ_INDEX] = irq;

   // reclock strobes in 100MHz domain

   reg [15:0]     ctrl = 16'b0;

   wire      ctrl_RST = ctrl[15];    // reset everything

   wire      ctrl_ABT = ctrl[14];    // abort bursts, clear arm

   wire      ctrl_TRIG = ctrl[8];    // manually trigger specified channels

   wire      ctrl_ARM = ctrl[0];    // arm specified channels for triggering

   always @(posedge clk) begin

     ctrl <= reg_w[`CTRL_INDEX];

   end

   reg [15:0]     irq_clr = 16'b0;

   always @(posedge clk)

     irq_clr <= reg_w[`IRQ_CLR_INDEX];

   // bit field assignments for CONF register

   wire [15:0]    conf = reg_w[`CONF_INDEX];

   wire     conf_MEAS_EN = conf[12];  // enable Zmon measurements on specified channels

   wire     conf_SRC_EN = conf[8];    // enable RF outputs on specified channels

   wire     conf_CONT = conf[4];    // enable continuous retriggering on specified channels

   wire     conf_TG_EN = conf[0];    // enable timing generators on specified channels

   // bit field assignments for TRIG_SRC register

   // 0 = off (manual only), 1-4 = specified TRIG input

   wire [15:0]    trig_src = reg_w[`TRIG_SRC_INDEX];

   // bit field assignments for IRQ_MASK register

   wire [15:0]    irq_mask = reg_w[`IRQ_MASK_INDEX];

   // bit field assignments for SYNC register

   // 0=MCU, 1=GEN, 4-7=TRIG1-4, 8-11=TDONE1-4, 12-15=MDONE1-4, 16-19=CONV[1:4], 20-23=GATE[1:4]

   wire [15:0]    sync = reg_w[`SYNC_INDEX];

   wire [7:0]     sync_GEN = sync[15:8];

   wire [4:0]     sync_SRC = sync[4:0];

   // bit field assignments for FILTER register

   wire [15:0]    filter_len = reg_w[`FILTER_INDEX];

   // assign RF channel bias enables

   assign VBUS1_EN_o = conf_TG_EN;

   // pulse generator

   reg [13:0]     gprescale = 14'b0;

   reg [7:0]     gcount = 8'b0;

   reg       gen = 1'b0;

   wire     gtick1ms = (gprescale == 14'b0);

   always @(posedge clk10)

     if (gtick1ms)

       gprescale <= 9999;

     else

       gprescale <= gprescale - 1;

   always @(posedge clk10)

     if (gtick1ms) begin

       if (gcount == 5)

         gen <= 1;

       else if (gcount == 0)

         gen <= 0;

       if (gcount == 0) begin

         if (sync_GEN > 4)

           gcount <= sync_GEN;

       end

     else

       gcount <= gcount - 1;

     end

   // input trigger filters

   wire [2:1]     trigflt;

   reg [2:1]     trigflt_dly = 2'b0;

   wire [2:1]     trig_rising = trigflt & ~trigflt_dly;

   wire [2:1]     trig_falling = ~trigflt & trigflt_dly;

   trig_filter filter1 (.I(TRIG1X_i), .O(trigflt[1]), .C(clk10), .N(filter_len));

   assign trigflt[2] = gen;

   // latch decoded trigger at valid rising edge

   always @(posedge clk) begin

      trigflt_dly <= trigflt;

   end

   // demux signals to timing generators

   reg      trig_mux;

   always @* begin

     case (trig_src[1*4-1 -: 4])

       4'd1: trig_mux = trig_falling[1];

       4'd5: trig_mux = trig_falling[2];

       default: trig_mux = 1'b0;

     endcase

   end

   reg      trig = 1'b0;

   always @(posedge clk)

      trig <= ctrl_TRIG | trig_mux;

   // demux signals for clearing MCU_TRIGIN

   reg      rising_mux;

   always @* begin

     case (trig_src[1*4-1 -: 4])

       4'd1: rising_mux = trig_rising[1];

       4'd5: rising_mux = trig_rising[2];

       default: rising_mux = 1'b0;

     endcase

   end

   // register block decodes

   reg         reg_sel;

   reg  [4:1]  tg_sel;

   wire [15:0] tg_dat[4:1];

   wire [15:0] reg_dat_o;

   always @* begin

      reg_sel = 0;

      tg_sel = 0;

      dat_o = 16'b0;

      if (adr[6] == 0) begin

        reg_sel = cs;

        dat_o = reg_dat_o;

      end

      else begin

        case (adr[5:4])

          2'd0: begin

            tg_sel[1] = cs;

            dat_o = tg_dat[1];

          end

          2'd1: begin

            tg_sel[2] = cs;

            dat_o = tg_dat[2];

          end

          2'd2: begin

            tg_sel[3] = cs;

            dat_o = tg_dat[3];

          end

          2'd3: begin

            tg_sel[4] = cs;

            dat_o = tg_dat[4];

          end

        endcase

      end

   end

   localparam WC = 8, WS = 8;

   wire [1*WC:1]  control;

   wire [1*WS-1:0]   status;

   wire [15:0]    irq_in;

   assign control[1*WC -: WC] = {ctrl_RST, ctrl_ABT, ctrl_ARM, trig, conf_MEAS_EN,

         conf_SRC_EN, conf_CONT, conf_TG_EN};

   assign stat[1*4-1 -: 4] = status[1*WS-5 -: 4];  // state machine value for each channel

   assign irq_in[1*4-1 -: 4] = status[1*WS-1 -: 4];  // interrupts from each channel

   // 0=MCU, 1=GEN, 4-7=TRIG1-4, 8-11=TDONE1-4, 12-15=MDONE1-4, 16-19=CONV[1:4], 20-23=GATE[1:4]

   always @*

     case (sync_SRC)

       5'd1:  SYNCOUTX_o = gen;          // GEN

       5'd4:  SYNCOUTX_o = trig;         // TRIG

       5'd8:  SYNCOUTX_o = irq_in[0];    // TDONE

       5'd12: SYNCOUTX_o = irq_in[12];   // MDONE

       5'd16: SYNCOUTX_o = CONV_o[1];    // CONV

       5'd20: SYNCOUTX_o = CH_GATE_o[1]; // RF_GATE

       default: SYNCOUTX_o = 1'b0;

     endcase

   wire [4:1] adc_sck;

   assign SCK_F_o = adc_sck;

   assign SCK_R_o = adc_sck;

   rs irq_latch[15:0] (.Q(irq), .S(irq_mask & irq_in), .R({16{ctrl_RST}} | irq_clr), .C(clk));

   // assign FPGA_IRQN = ~|(irq_mask & irq_in);    // IRQ pulse for each event

   assign MMC_IRQN_o = ~|irq;        // latched IRQ

   // Apply default values to unused signals

   assign CH_GATE_o[2] = 1'bZ;

   assign CH_GATE_o[3] = 1'bZ;

   assign CH_GATE_o[4] = 1'bZ;

   assign BIASON_o[1]  = 1'bZ;

   assign BIASON_o[2]  = 1'bZ;

   assign BIASON_o[3]  = 1'bZ;

   assign BIASON_o[4]  = 1'bZ;

   assign CH_CTRL1_io[1] = 1'bZ;

   assign CH_CTRL1_io[2] = 1'bZ;

   assign CH_CTRL1_io[3] = 1'bZ;

   assign CH_CTRL1_io[4] = 1'bZ;

   assign CH_CTRL0_io[1] = 1'bZ;

   assign CH_CTRL0_io[2] = 1'bZ;

   assign CH_CTRL0_io[3] = 1'bZ;

   assign CH_CTRL0_io[4] = 1'bZ;

//  genvar i;

//  for (i=1; i<=4; i=i+1) begin

//    tg tg1 (

//      .clk(clk),

//      .rst_i(fpga_rst),

//      .clk200(clk200),

//      .adr_i(adr[3:0]),

//      .dat_i(dat),

//      .we_i(we),

//      .oe_i(oe),

//      .cs_i(tg_sel[1]),

//      .dat_o(tg_dat[1]),

//      .control(control),

//      .status(status),

//      .rf_gate(CH_GATE_o[1]),

//      .adc_sck_o(adc_sck[1]),

//      .conv_o(CONV_o[1]),

//      .adcr_sdo_i(SDO_R_i[1]),

//      .adcf_sdo_i(SDO_F_i[1])

//    );

//  end

  registers reggie (

    .clk_i(clk200),

    .rst_i(fpga_rst),

    .adr_i(adr[5:0]),

    .dat_i(dat),

    .we_i(we),

    .oe_i(oe),

    .cs_i(reg_sel),

    .dat_o(reg_dat_o),

    .reg_w(reg_w),

    .reg_r(reg_r)

  );

  // MMC card command receiver

  wire  [47:0] mmc_cmd_raw;

  wire         mmc_cmd_done;

  wire         mmc_cmd_crc_err;

  wire         mmc_cmd_dir_err;

  wire         mmc_cmd_stop_err;

  sd_card_cmd_rx mmc_rx1

  (

    // Asynchronous reset

    .sys_rst_n(RESETN_i),

    // SD/MMC card command signals

    .sd_clk_i(MMC_CLK_i),

    .sd_cmd_i(MMC_CMD_io),

    // Command outputs

    .cmd_raw_o(mmc_cmd_raw),

    .cmd_index_o(),

    .cmd_arg_o(),

    .cmd_done_o(mmc_cmd_done),

    .crc_err_o(mmc_cmd_crc_err),

    .dir_err_o(mmc_cmd_dir_err),

    .stop_err_o(mmc_cmd_stop_err)

  );

  // MMC card emulator

  wire         mmc_cmd;

  wire         mmc_cmd_drv;

  wire         mmc_cmd_zzz;

  wire         mmc_cmd_choice;

  wire   [7:0] mmc_dat;

  wire   [7:0] mmc_dat_zzz;

  wire   [7:0] mmc_dat_choice1;