// ***************************************************************************
// ***************************************************************************
// Copyright 2011(c) Analog Devices, Inc.
// 
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// are permitted provided that the following conditions are met:
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// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************

`timescale 1ns/100ps

module axi_ad7175 (

  // adc interface (clk, data, over-range)
  
  adc_sdo_i,
  adc_sdi_o,
  adc_cs_o,
  adc_sclk_o,
  adc_clk_i,

  // dma interface

  adc_clk,
  adc_valid_0,
  adc_enable_0,
  adc_data_0,
  adc_valid_1,
  adc_enable_1,
  adc_data_1,
  adc_dovf,
  adc_dunf,

  // axi interface

  s_axi_aclk,
  s_axi_aresetn,
  s_axi_awvalid,
  s_axi_awaddr,
  s_axi_awready,
  s_axi_wvalid,
  s_axi_wdata,
  s_axi_wstrb,
  s_axi_wready,
  s_axi_bvalid,
  s_axi_bresp,
  s_axi_bready,
  s_axi_arvalid,
  s_axi_araddr,
  s_axi_arready,
  s_axi_rvalid,
  s_axi_rresp,
  s_axi_rdata,
  s_axi_rready);

  // parameters

  parameter PCORE_ID = 0;
  parameter PCORE_DEVICE_TYPE = 0;
  parameter PCORE_ADC_DP_DISABLE = 0;
  parameter PCORE_IODELAY_GROUP = "adc_if_delay_group";
  parameter C_S_AXI_MIN_SIZE = 32'hffff;

  // adc interface (clk, data, over-range)

  input 			adc_sdo_i;
  output 			adc_sdi_o;
  output 			adc_cs_o;
  output 			adc_sclk_o;
  input				adc_clk_i;

  // dma interface

  output          adc_clk;
  output          adc_valid_0;
  output          adc_enable_0;
  output  [31:0]  adc_data_0;
  output          adc_valid_1;
  output          adc_enable_1;
  output  [31:0]  adc_data_1;
  input           adc_dovf;
  input           adc_dunf;


  // axi interface

  input           s_axi_aclk;
  input           s_axi_aresetn;
  input           s_axi_awvalid;
  input   [31:0]  s_axi_awaddr;
  output          s_axi_awready;
  input           s_axi_wvalid;
  input   [31:0]  s_axi_wdata;
  input   [ 3:0]  s_axi_wstrb;
  output          s_axi_wready;
  output          s_axi_bvalid;
  output  [ 1:0]  s_axi_bresp;
  input           s_axi_bready;
  input           s_axi_arvalid;
  input   [31:0]  s_axi_araddr;
  output          s_axi_arready;
  output          s_axi_rvalid;
  output  [ 1:0]  s_axi_rresp;
  output  [31:0]  s_axi_rdata;
  input           s_axi_rready;

  // internal registers

  reg     [31:0]  up_rdata = 'd0;
  reg             up_rack = 'd0;
  reg             up_wack = 'd0;

  // internal clocks & resets

  wire            adc_rst;
  wire            up_rstn;
  wire            up_clk;
  wire    [13:0]  up_waddr_s;
  wire    [13:0]  up_raddr_s;

  // internal signals

  wire            adc_status_s;
  wire            up_sel_s;
  wire            up_wr_s;
  wire    [13:0]  up_addr_s;
  wire    [31:0]  up_wdata_s;
  wire    [31:0]  up_rdata_s[0:2];
  wire            up_rack_s[0:2];
  wire            up_wack_s[0:2];
  
  wire    [31:0]   adc_data_s;
  wire 	  [ 1:0]   adc_reg_rw_s;
  wire    [31:0]   adc_reg_address_s;
  wire    [31:0]   adc_reg_data_w_s;
  wire    [31:0]   adc_rx_data_s;
  wire             adc_rx_data_rdy_s;
  wire			   adc_tx_data_rdy_s;

  // signal name changes
  assign adc_clk = s_axi_aclk;
  assign up_clk = s_axi_aclk;
  assign up_rstn = s_axi_aresetn;

  // processor read interface

  always @(negedge up_rstn or posedge up_clk) begin
    if (up_rstn == 0) begin
      up_rdata <= 'd0;
      up_rack <= 'd0;
      up_wack <= 'd0;
    end else begin      
      up_rdata <= up_rdata_s[0] | up_rdata_s[1] | up_rdata_s[2];
      up_rack <= up_rack_s[0] | up_rack_s[1] | up_rack_s[2];
      up_wack <= up_wack_s[0] | up_wack_s[1] | up_wack_s[2];
    end
  end

  // channel

  axi_ad7175_channel #(
    .CHID(0),
    .DP_DISABLE (PCORE_ADC_DP_DISABLE))
  i_channel_0 (
    .adc_clk (adc_clk),
    .adc_rst (adc_rst),
    .adc_data ({8'b0, adc_data_s[23:0]}),
	.adc_valid_in(data_rd_ready_s && (adc_data_s[25:24] == 2'b0)),
    .adc_data_out (adc_data_0),
	.adc_valid (adc_valid_0),
    .adc_enable (adc_enable_0),
    .up_rstn (up_rstn),
    .up_clk (up_clk),
    .up_wreq (up_wreq_s),
    .up_waddr (up_waddr_s),
    .up_wdata (up_wdata_s),
    .up_wack (up_wack_s[0]),
    .up_rreq (up_rreq_s),
    .up_raddr (up_raddr_s),
    .up_rdata (up_rdata_s[0]),
    .up_rack (up_rack_s[0]));

  // channel

  axi_ad7175_channel #(
    .CHID(1),
    .DP_DISABLE (PCORE_ADC_DP_DISABLE))
  i_channel_1 (
    .adc_clk (adc_clk),
    .adc_rst (adc_rst),
    .adc_data ({8'b0, adc_data_s[23:0]}),
	.adc_valid_in(data_rd_ready_s && (adc_data_s[25:24] == 2'b1)),
    .adc_data_out (adc_data_1),
	.adc_valid (adc_valid_1),
    .adc_enable (adc_enable_1),
    .up_rstn (up_rstn),
    .up_clk (up_clk),
    .up_wreq (up_wreq_s),
    .up_waddr (up_waddr_s),
    .up_wdata (up_wdata_s),
    .up_wack (up_wack_s[1]),
    .up_rreq (up_rreq_s),
    .up_raddr (up_raddr_s),
    .up_rdata (up_rdata_s[1]),
    .up_rack (up_rack_s[1]));

  // main (device interface)

ad7175_if ad7175_if_i(
	.fpga_clk_i(s_axi_aclk),
    .adc_clk_i(adc_clk_i),
    .reset_n_i(~adc_rst),
	
	.start_conversion_i(1'b1),
    .dma_data_o(adc_data_s),
    .dma_data_rdy_o(data_rd_ready_s),
	
	.start_transmission_i(adc_reg_rw_s[1]),
	.tx_data_i({adc_reg_address_s[7:0], adc_reg_data_w_s[23:0]}),
	.tx_data_rdy_o(adc_tx_data_rdy_s),
	
	.start_read_i(adc_reg_rw_s[0]),       
	.rx_data_o(adc_rx_data_s),
	.rx_data_rdy_o(adc_rx_data_rdy_s),
    
	.adc_sdo_i(adc_sdo_i),
    .adc_sdi_o(adc_sdi_o),
    .adc_cs_o(adc_cs_o),
    .adc_sclk_o(adc_sclk_o),
    .adc_status_o(adc_status_s));

  // common processor control

  up_adc_common #(.PCORE_ID(PCORE_ID)) i_up_adc_common (
    .mmcm_rst (),
    .adc_clk (adc_clk),
    .adc_rst (adc_rst),
    .adc_r1_mode (),
    .adc_ddr_edgesel (),
    .adc_pin_mode (),
    .adc_status (adc_status_s),
    .adc_status_ovf (adc_dovf),
    .adc_status_unf (adc_dunf),
    .adc_clk_ratio (32'd1),

	.adc_reg_address(adc_reg_address_s),
    .adc_reg_data_r(adc_rx_data_s),
    .adc_reg_data_w(adc_reg_data_w_s),
    .adc_reg_rw(adc_reg_rw_s),
    .adc_reg_done(adc_tx_data_rdy_s | adc_rx_data_rdy_s),  

    .up_status_pn_err (1'b0),
    .up_status_pn_oos (1'b0),
    .up_status_or (1'b0),
    .delay_clk (),
    .delay_rst (),
    .delay_sel (),
    .delay_rwn (),
    .delay_addr (),
    .delay_wdata (),
    .delay_rdata (),
    .delay_ack_t (),
    .delay_locked (),
    .drp_clk (1'd0),
    .drp_rst (),
    .drp_sel (),
    .drp_wr (),
    .drp_addr (),
    .drp_wdata (),
    .drp_rdata (16'd0),
    .drp_ready (1'd0),
    .drp_locked (1'd1),
    .up_usr_chanmax (),
    .adc_usr_chanmax (8'd0),
    .up_adc_gpio_in (),
    .up_adc_gpio_out (),
    .up_rstn (up_rstn),
    .up_clk (up_clk),
    .up_wreq (up_wreq_s),
    .up_waddr (up_waddr_s),
    .up_wdata (up_wdata_s),
    .up_wack (up_wack_s[2]),
    .up_rreq (up_rreq_s),
    .up_raddr (up_raddr_s),
    .up_rdata (up_rdata_s[2]),
    .up_rack (up_rack_s[2]));

  // up bus interface

  up_axi i_up_axi (
    .up_rstn (up_rstn),
    .up_clk (up_clk),
    .up_axi_awvalid (s_axi_awvalid),
    .up_axi_awaddr (s_axi_awaddr),
    .up_axi_awready (s_axi_awready),
    .up_axi_wvalid (s_axi_wvalid),
    .up_axi_wdata (s_axi_wdata),
    .up_axi_wstrb (s_axi_wstrb),
    .up_axi_wready (s_axi_wready),
    .up_axi_bvalid (s_axi_bvalid),
    .up_axi_bresp (s_axi_bresp),
    .up_axi_bready (s_axi_bready),
    .up_axi_arvalid (s_axi_arvalid),
    .up_axi_araddr (s_axi_araddr),
    .up_axi_arready (s_axi_arready),
    .up_axi_rvalid (s_axi_rvalid),
    .up_axi_rresp (s_axi_rresp),
    .up_axi_rdata (s_axi_rdata),
    .up_axi_rready (s_axi_rready),
    .up_wreq (up_wreq_s),
    .up_waddr (up_waddr_s),
    .up_wdata (up_wdata_s),
    .up_wack (up_wack),
    .up_rreq (up_rreq_s),
    .up_raddr (up_raddr_s),
    .up_rdata (up_rdata),
    .up_rack (up_rack));

endmodule

// ***************************************************************************
// ***************************************************************************