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//2005-1-18      btltz@mail.china.com      btltz from CASIC,China  

//File=Module=SPW_I_vlogcore    2005-2-18      btltz@mail.china.com      btltz from CASIC,China 

//Description:   SpaceWire RxTx top module with Wishbone interface to node device(the host) or communication mem.    

//                "A SpaceWire node comprise one or more SpaceWire link interfaces

//                (encoder-decoders) and an interface to the host system,represents an interface between 

//                a SpaceWire network and an application system using the network services."

//Approximate area:

//Origin:        SpaceWire Std-Draft-1 of ECSS(European Cooperation for Space Standardization),ESTEC,ESA

//               

//--     TODO:

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

//

/*synthesis translate off*/

`timescale 1ns/10ps

/*synthesis translate on */

`define USE_XIL_DEVICE

module SPW_I_vlogcore #(parameter CH_NUM = 3)                              //Triple Modulo Redundant (TMR)

                      ( output [CH_NUM-1:0] Dout,Doutb, Sout,Soutb,   //LVDS pad

                        input  [CH_NUM-1:0] Sin, Sinb,  Din, Dinb,        //LVDS pad. 8 pads/pin for 1 channel

                                                          output int_LnkErr_o,

                                                          output TICK_o, TICK_i,

                       input  reset,gclk

                        );

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

// LVDS IO

//

`ifdef USE_XIL_DEVICE

wire [CH_NUM-1:0] Si,Di,  So,Do;

generate

begin:Gen_LVDS_PADS

genvar k;

 for (k=0; k<CH_NUM, k=k+1)

 IBUFDS_LVDS_25   inst_LVDS_Di ( .I(Din[k])                 // P-channel data 

                                 .IB(Dinb[k])       // N-channel data 

                                                                                   .O(Di[k]) );     // Non-differential data input

 IBUFDS_LVDS_25   inst_LVDS_Si ( .I(Sin[k])                 // P-channel strobe 

                                 .IB(Sinb[k])       // N-channel strobe 

                                                                                   .O(Si[k]) );     // Non-differential strobe input

 OBUFDS_LVDS_25   inst_LVDS_Do ( .I(Do[k]),                      //Non-differential data output

                                .O(Dout[k]),                     //P-channel output 

                                .OB(Doutb[k])  );        //N-channel output

 OBUFDS_LVDS_25   inst_LVDS_So ( .I(So[k]),                      //Non-differential strobe output

                                .O(Sout[k]),                     //P-channel output

                                .OB(Soutb[k])  );        //N-channel output

end    //end block Gen_LVDS_PADS

endgenerate

`endif

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

// Synchronizer 

// between 2 clock domain 

synchronizer_flop  #(WIDTH*2) inst_Syn_flops(.sync_data_out(),

                                      .data_in(),

                                      .clk(),

                                      .async_reset()

                                      );

/********** Instantiations of low level modules ****************/

////// Channels //////

generate

begin:G_channel

genvar i;

 for(i=0; i<CHANNEL_NUM; i=i+1)

   SPW_CODEC  #() CODEC_xChannels  (

                                 );

end

endgenerate

Gluelogic inst_fifo_crc  ();

WB_COMI_HOCI inst_WB_IF  ();

JTAG_spw  inst_JTAG_IO  ();

endmodule