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[/] [theia_gpu/] [branches/] [beta_1.1/] [rtl/] [Collaterals/] [Module_FixedPointSquareRoot.v] - Blame information for rev 228

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`timescale 1ns / 1ps
`include "aDefinitions.v"
 
 
`define SR_AFTER_RESET_STATE 0
//-----------------------------------------------------------------
/*
 
        Calcualtes the SquareRoot of a Fixed Point Number
        Input:  Q32.32
        Output: Q16.16
        Notice that the result has half the precicion as the operands!!
*/
module FixedPointSquareRoot
(
        input wire                                                      Clock,
        input wire                                                      Reset,
        input wire[`LONG_WIDTH-1:0]      Operand,
        input wire                                                      iInputReady,
        output  reg                                             OutputReady,
        output  reg [`WIDTH-1:0]         Result
);
 
reg[63:0]                        x;
reg[0:`WIDTH-1]  group,sum,diff;
reg[0:`WIDTH-1]          temp1,temp2;
reg     [5:0]                    CurrentState, NextState;
 
reg myInputReady;
 
//----------------------------------------
always @(posedge Clock)
begin
        myInputReady = iInputReady;
end
//----------------------------------------
//Next states logic
always @(negedge Clock)
begin
        if( Reset!=1 )
           CurrentState = NextState;
                         else
                                CurrentState = `SR_AFTER_RESET_STATE;
end
//----------------------------------------
 
always @ (posedge Clock)
begin
        case (CurrentState)
        //----------------------------------------
        `SR_AFTER_RESET_STATE:
        begin
                OutputReady = 0;
                Result          = 0;
                sum                     = 0;
                diff                    = 0;
                group=32;                               //WAS 16
                x = 0;
                if ( myInputReady == 1  )
                begin
                  // x[31:0] = Operand;
                  x = Operand;
                        x = x << `SCALE;
                        NextState = `SQUARE_ROOT_LOOP;
                end else
                        NextState = `SR_AFTER_RESET_STATE;
 
        end
        //----------------------------------------
        `SQUARE_ROOT_LOOP:
        begin
 
 
 
                sum = sum << 1;
                sum = sum +  1;
                temp1 = diff << 2;
                //diff = diff + (x>>(group*2)) &3;
                temp2 = group << 1;                             //group * 2 ??
                diff = temp1 + ((x >> temp2) &3);
 
                if (sum > diff)
                begin
                        sum = sum -1;
                end
                else
                begin
                        Result = Result + (1<<group);
                        diff = diff - sum;
                        sum = sum + 1;
                end//if
 
 
                if ( group != 0 )
                begin
                        group = group - 1;
                        NextState = `SQUARE_ROOT_LOOP;
                end
                else
                begin
                        NextState       = `WRITE_SQUARE_ROOT_RESULT;
 
                end
        end
        //----------------------------------------
        `WRITE_SQUARE_ROOT_RESULT:
        begin
                OutputReady = 1;
                NextState = (iInputReady == 0) ?
                 `SR_AFTER_RESET_STATE : `WRITE_SQUARE_ROOT_RESULT;
        end
        //----------------------------------------
endcase
end //always
endmodule
//-----------------------------------------------------------------

Line No.	Rev	Author	Line
1	44	diegovalve	`timescale 1ns / 1ps
2			`include "aDefinitions.v"
3
4
5			`define SR_AFTER_RESET_STATE 0
6			`//-----------------------------------------------------------------`
7			`/*`
8
9			`Calcualtes the SquareRoot of a Fixed Point Number`
10			`Input: Q32.32`
11			`Output: Q16.16`
12			`Notice that the result has half the precicion as the operands!!`
13			`*/`
14			`module FixedPointSquareRoot`
15			`(`
16			`input wire Clock,`
17			`input wire Reset,`
18			input wire[`LONG_WIDTH-1:0] Operand,
19			`input wire iInputReady,`
20			`output reg OutputReady,`
21			output reg [`WIDTH-1:0] Result
22			`);`
23
24			`reg[63:0] x;`
25			reg[0:`WIDTH-1] group,sum,diff;
26			reg[0:`WIDTH-1] temp1,temp2;
27			`reg [5:0] CurrentState, NextState;`
28
29			`reg myInputReady;`
30
31			`//----------------------------------------`
32			`always @(posedge Clock)`
33			`begin`
34			`myInputReady = iInputReady;`
35			`end`
36			`//----------------------------------------`
37			`//Next states logic`
38			`always @(negedge Clock)`
39			`begin`
40			`if( Reset!=1 )`
41			`CurrentState = NextState;`
42			`else`
43			CurrentState = `SR_AFTER_RESET_STATE;
44			`end`
45			`//----------------------------------------`
46
47			`always @ (posedge Clock)`
48			`begin`
49			`case (CurrentState)`
50			`//----------------------------------------`
51			`SR_AFTER_RESET_STATE:
52			`begin`
53			`OutputReady = 0;`
54			`Result = 0;`
55			`sum = 0;`
56			`diff = 0;`
57			`group=32; //WAS 16`
58			`x = 0;`
59			`if ( myInputReady == 1 )`
60			`begin`
61			`// x[31:0] = Operand;`
62			`x = Operand;`
63			x = x << `SCALE;
64			NextState = `SQUARE_ROOT_LOOP;
65			`end else`
66			NextState = `SR_AFTER_RESET_STATE;
67
68			`end`
69			`//----------------------------------------`
70			`SQUARE_ROOT_LOOP:
71			`begin`
72
73
74
75			`sum = sum << 1;`
76			`sum = sum + 1;`
77			`temp1 = diff << 2;`
78			`//diff = diff + (x>>(group*2)) &3;`
79			`temp2 = group << 1; //group * 2 ??`
80			`diff = temp1 + ((x >> temp2) &3);`
81
82			`if (sum > diff)`
83			`begin`
84			`sum = sum -1;`
85			`end`
86			`else`
87			`begin`
88			`Result = Result + (1<<group);`
89			`diff = diff - sum;`
90			`sum = sum + 1;`
91			`end//if`
92
93
94			`if ( group != 0 )`
95			`begin`
96			`group = group - 1;`
97			NextState = `SQUARE_ROOT_LOOP;
98			`end`
99			`else`
100			`begin`
101			NextState = `WRITE_SQUARE_ROOT_RESULT;
102
103			`end`
104			`end`
105			`//----------------------------------------`
106			`WRITE_SQUARE_ROOT_RESULT:
107			`begin`
108			`OutputReady = 1;`
109			`NextState = (iInputReady == 0) ?`
110			`SR_AFTER_RESET_STATE : `WRITE_SQUARE_ROOT_RESULT;
111			`end`
112			`//----------------------------------------`
113			`endcase`
114			`end //always`
115			`endmodule`
116			`//-----------------------------------------------------------------`

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[/] [theia_gpu/] [branches/] [beta_1.1/] [rtl/] [Collaterals/] [Module_FixedPointSquareRoot.v] - Blame information for rev 228