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[/] [openrisc/] [trunk/] [orpsocv2/] [rtl/] [verilog/] [or1200/] [or1200_fpu_div.v] - Blame information for rev 854

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Line No. Rev Author Line
1 350 julius
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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////  or1200_fpu_div                                              ////
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////                                                              ////
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////  This file is part of the OpenRISC 1200 project              ////
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////  http://opencores.org/project,or1k                           ////
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////                                                              ////
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////  Description                                                 ////
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////  division entity for the division unit                       ////
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////                                                              ////
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////  To Do:                                                      ////
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////                                                              ////
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////                                                              ////
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////  Author(s):                                                  ////
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////      - Original design (FPU100) -                            ////
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////        Jidan Al-eryani, jidan@gmx.net                        ////
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////      - Conv. to Verilog and inclusion in OR1200 -            ////
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////        Julius Baxter, julius@opencores.org                   ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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//
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//  Copyright (C) 2006, 2010
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//
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//      This source file may be used and distributed without        
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//      restriction provided that this copyright statement is not   
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//      removed from the file and that any derivative work contains 
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//      the original copyright notice and the associated disclaimer.
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//                                                           
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//              THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     
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//      EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   
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//      TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   
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//      FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      
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//      OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         
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//      INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    
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//      (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   
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//      GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        
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//      BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  
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//      LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  
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//      (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  
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//      OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         
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//      POSSIBILITY OF SUCH DAMAGE. 
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//
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module or1200_fpu_div
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  (
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   clk_i,
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   dvdnd_i,
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   dvsor_i,
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   sign_dvd_i,
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   sign_div_i,
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   start_i,
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   ready_o,
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   qutnt_o,
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   rmndr_o,
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   sign_o,
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   div_zero_o
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   );
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   parameter FP_WIDTH = 32;
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   parameter MUL_SERIAL = 0; // 0 for parallel multiplier, 1 for serial
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   parameter MUL_COUNT = 11; //11 for parallel multiplier, 34 for serial
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   parameter FRAC_WIDTH = 23;
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   parameter EXP_WIDTH = 8;
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   parameter ZERO_VECTOR = 31'd0;
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   parameter INF = 31'b1111111100000000000000000000000;
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   parameter QNAN = 31'b1111111110000000000000000000000;
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   parameter SNAN = 31'b1111111100000000000000000000001;
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   input clk_i;
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   input [2*(FRAC_WIDTH+2)-1:0] dvdnd_i;
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   input [FRAC_WIDTH+3:0]        dvsor_i;
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   input                        sign_dvd_i;
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   input                        sign_div_i;
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   input                        start_i;
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   output                       ready_o;
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   output [FRAC_WIDTH+3:0]       qutnt_o;
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   output [FRAC_WIDTH+3:0]       rmndr_o;
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   output                       sign_o;
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   output                       div_zero_o;
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   parameter t_state_waiting = 1'b0,
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               t_state_busy = 1'b1;
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   reg [FRAC_WIDTH+3:0]  s_qutnt_o;
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   reg [FRAC_WIDTH+3:0]  s_rmndr_o;
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   reg [2*(FRAC_WIDTH+2)-1:0]    s_dvdnd_i;
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   reg [FRAC_WIDTH+3:0]  s_dvsor_i;
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   reg                          s_sign_dvd_i, s_sign_div_i;
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   wire                         s_sign_o;
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   wire                         s_div_zero_o;
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   reg                          s_start_i;
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   reg                          s_ready_o;
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   reg                          s_state;
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   reg [4:0]                     s_count;
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   reg [FRAC_WIDTH+3:0]  s_dvd;
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   // Input Register
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   always @(posedge clk_i)
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     begin
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        s_dvdnd_i <= dvdnd_i;
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        s_dvsor_i <= dvsor_i;
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        s_sign_dvd_i<= sign_dvd_i;
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        s_sign_div_i<= sign_div_i;
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        s_start_i <= start_i;
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     end
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   assign qutnt_o = s_qutnt_o;
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   assign rmndr_o = s_rmndr_o;
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   assign sign_o = s_sign_o;
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   assign ready_o = s_ready_o;
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   assign div_zero_o = s_div_zero_o;
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   assign s_sign_o = sign_dvd_i ^ sign_div_i;
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   assign s_div_zero_o = !(|s_dvsor_i) & (|s_dvdnd_i);
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   always @(posedge clk_i)
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     if (s_start_i)
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       begin
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          s_state <= t_state_busy;
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          s_count <= 26;
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       end
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     else if (!(|s_count) & s_state==t_state_busy)
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       begin
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          s_state <= t_state_waiting;
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          s_ready_o <= 1;
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          s_count <=26;
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       end
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     else if (s_state==t_state_busy)
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       s_count <= s_count - 1;
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     else
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       begin
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          s_state <= t_state_waiting;
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          s_ready_o <= 0;
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       end
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   wire [26:0] v_div;
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   assign v_div = (s_count==26) ? {3'd0,s_dvdnd_i[49:26]} : s_dvd;
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   wire [26:0] v_div_minus_s_dvsor_i;
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   assign v_div_minus_s_dvsor_i = v_div - s_dvsor_i;
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   always @(posedge clk_i)
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     begin
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        //Reset
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        if (s_start_i)
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          begin
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             s_qutnt_o <= 0;
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             s_rmndr_o <= 0;
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          end
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        else if (s_state==t_state_busy)
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          begin
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             if (v_div < s_dvsor_i)
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               begin
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                  s_qutnt_o[s_count] <= 1'b0;
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                  s_dvd <= {v_div[25:0],1'b0};
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               end
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             else
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               begin
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                  s_qutnt_o[s_count] <= 1'b1;
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                  s_dvd <= {v_div_minus_s_dvsor_i[25:0],1'b0};
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               end
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             s_rmndr_o <= v_div;
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          end // if (s_state==t_state_busy)
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     end // always @ (posedge clk_i)
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endmodule // or1200_fpu_div
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