sub_float.v

IEEE754 floating point sub

/* ------------------------------------------------------------
// MODULE: SUB_Float (no clock , two floating inputs alignment, for SM floating point)
// Edition: one
// Matlab Code:  None
// C Code: None
// Architecture Diagram: add_sub_floating.ppt
// Date: 2008/01/31
// Update: 2008/01/31	   
// ------------------------------------------------------------ */
`include "Float_Fix_Front.v" 
`include "SUB_Fix.v"
`include "Fix_float_Back_Bus26.v"


module SUB_Flaot(data_1_in,data_2_in,data_out);

/* ------------------------------------------------------------
// Parameters definition
// ------------------------------------------------------------ */

parameter data_lng=32,//data_in length
	  exp_lng=7,//data_in exponent part length
	  sgnfc_lng=25;//data_in significant part length
 
/* ------------------------------------------------------------
// I/O declaration
// ------------------------------------------------------------ */
input [data_lng-1:0]data_1_in,data_2_in; //include sgnfc and exp part

output [data_lng-1:0]data_out; // data_out
/* ------------------------------------------------------------
// Connection wire declaration
// ------------------------------------------------------------ */

wire [exp_lng-1:0]exp_for_op;

wire [sgnfc_lng:0] data_1_sgnfc_for_op,data_2_sgnfc_for_op,data_out_sgnfc_from_op;

wire [data_lng-1:0]data_out;

/* ------------------------------------------------------------
// Module instance
// ------------------------------------------------------------ */
Float_Fix_Front #(data_lng,exp_lng,sgnfc_lng,sgnfc_lng+1) fff0
(.data_1_in(data_1_in),.data_2_in(data_2_in),.data_1_sgnfc_out(data_1_sgnfc_for_op),.data_2_sgnfc_out(data_2_sgnfc_for_op),.exp_out(exp_for_op));

SUB_Fix #(sgnfc_lng+1) s0
(.In_x(data_1_sgnfc_for_op),.In_y(data_2_sgnfc_for_op),.Out(data_out_sgnfc_from_op));

Fix_float_Back_Bus26 #(data_lng+1,sgnfc_lng+1,sgnfc_lng,exp_lng,data_lng) fffb0
(.sgnfc_in(data_out_sgnfc_from_op),.exp_in(exp_for_op),.data_out(data_out));

endmodule