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`timescale 1ns / 1ps

////////////////////////////////////////////////////////////////////////////////

// Company: 

// Engineer:

//

// Create Date:    17:21:58 11/24/05

// Design Name:    

// Module Name:    rxNumCounter

// Project Name:   

// Target Device:  

// Tool versions:  

// Description:   This module only deals with cycles with 64bits

//

// Dependencies:

// 

// Revision:

// Revision 0.01 - File Created

// Additional Comments:

// 

////////////////////////////////////////////////////////////////////////////////

module rxNumCounter(rxclk, reset, start_data_cnt, start_tagged_cnt, small_frame,

                    integer_cnt, small_integer_cnt, end_data_cnt, tagged_frame,

                                                  end_small_cnt, end_tagged_cnt);

         input rxclk;            //receive clk   

    input reset;                                 //globe reset

    input start_data_cnt;        //start to count       data field

    input start_tagged_cnt; //start to count tagged frame       

    input small_frame;

         input tagged_frame;

         input[12:0] integer_cnt;      //number of 64bits DATA field contains

         input[12:0] small_integer_cnt;//number of 64bits real DATA field contains(without pad part)

    output end_data_cnt;   //end of data field(only 64bits aligned data)

         output end_small_cnt;  //end of true data field of small frame(only 64bits aligned data)

         output end_tagged_cnt; //end of true data field of tagged frame(only 64bits aligned data) 

         wire   end_cnt;

         wire[12:0] data_cnt;

         wire[12:0] tagged_data_cnt;

         wire end_normal_data_cnt;

         // Data counter

    // used in rxReceiveData field, 

    // this counter is used for frames whose length is larger than 64

    // Of course it also count actual bytes of frames whose length is shorter than 64.

    counter data_counter(.clk(rxclk), .reset(reset), .load(end_cnt), .en(start_data_cnt), .value(data_cnt));

         defparam data_counter.WIDTH = 13;

    counter tagged_counter(.clk(rxclk), .reset(reset), .load(end_tagged_cnt), .en(start_tagged_cnt), .value(tagged_data_cnt));

         defparam tagged_counter.WIDTH = 13;

         assign end_cnt = end_data_cnt | start_tagged_cnt | ~start_data_cnt;

         assign end_normal_data_cnt = (data_cnt == integer_cnt);

         assign end_small_cnt = small_frame & (data_cnt == small_integer_cnt);

         assign end_tagged_cnt = tagged_frame & (tagged_data_cnt == integer_cnt);

         assign end_data_cnt = end_tagged_cnt | end_normal_data_cnt;

endmodule