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

 *

 * Copyright 2012, Sinclair R.F., Inc.

 *

 * Top-level module to demonstrate reading four TMP100 I2C temperature sensors

 * and  to display their hex outputs to a console about once per second.

 *

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

module sp601(

  // 200 MHz differential clock

  input  wire   ip_sysclk_p,

  input  wire   ip_sysclk_n,

  // I2C bus

  inout  wire   iop_i2c_scl,

  inout  wire   iop_i2c_sda,

  // UART Tx

  output wire   op_usb_1_rx,

  // echo I2C bus to logic analyzer

  output wire   op_i2c_scl,

  output wire   op_i2c_sda

);

/*

 * Generate a 100 MHz clock from the 200 MHz oscillator.

 */

wire s_sysclk;

IBUFGDS sysclk_inst(

  .I    (ip_sysclk_p),

  .IB   (ip_sysclk_n),

  .O    (s_sysclk)

);

wire s_divclk;

BUFIO2 #(

  .DIVIDE               (4),

  .DIVIDE_BYPASS        ("FALSE"),

  .USE_DOUBLER          ("TRUE")

) bufio2_inst (

  .I            (s_sysclk),

  .IOCLK        (),

  .DIVCLK       (s_divclk),

  .SERDESSTROBE ()

);

wire s_clk;

BUFG sclk_inst(

  .I    (s_divclk),

  .O    (s_clk)

);

/*

 * Generate a synchronous reset.

 */

reg [3:0] s_reset_count = 4'hF;

always @ (posedge s_clk)

  s_reset_count <= s_reset_count - 4'd1;

reg s_rst = 1'b1;

always @ (posedge s_clk)

  if (s_reset_count == 4'd0)

    s_rst <= 1'b0;

  else

    s_rst <= s_rst;

/*

 * Instantiate the micro controller.

 */

i2c_tmp100 ie_inst(

  // synchronous reset and processor clock

  .i_rst        (s_rst),

  .i_clk        (s_clk),

  // I2C bus

  .io_scl       (iop_i2c_scl),

  .io_sda       (iop_i2c_sda),

  // UART_Tx port

  .o_UART_Tx    (op_usb_1_rx)

);

/*

 * Copy the I2C bus to the logic analyzer outputs.

 */

assign op_i2c_scl = iop_i2c_scl;

assign op_i2c_sda = iop_i2c_sda;

endmodule