Subversion Repositories aes-128_pipelined_encryption

/*

Project        : AES

Standard doc.  : FIPS 197

Module name    : SubBytes block

Dependancy     :

Design doc.    :

References     :

Description    : uses SBox module to substitute every bytein the 128bit data

Owner          : Amr Salah

*/

`timescale 1 ns/1 ps

module SubBytes

#

(

 parameter DATA_W = 128,       //data width

 parameter NO_BYTES = DATA_W >> 3  //no of bytes = data width / 8

)

(

input clk,                     //system clock

input reset,                   //asynch active low reset

input valid_in,                //input valid signal  

input [DATA_W-1:0] data_in,    //input data

output reg valid_out,          //output valid signal

output [DATA_W-1:0] data_out   //output data

)

;

genvar i;

generate                      //generating sbox roms 

for (i=0; i< NO_BYTES ; i=i+1) begin : ROM

  SBox ROM(clk,reset,valid_in,data_in[(i*8)+7:(i*8)],data_out[(i*8)+7:(i*8)]);

end

endgenerate

always@(posedge clk or negedge reset)   //valid out register

if(!reset)begin

    valid_out <= 1'b0;

end else begin

    valid_out <= valid_in;

  end

endmodule