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[/] [cavlc/] [trunk/] [rtl/] [cavlc_fsm.v] - Blame information for rev 7

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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  cavlc_fsm                                                   ////
////                                                              ////
////  Description                                                 ////
////      controls the cavlc parsing process                      ////
////                                                              ////
////  Author(s):                                                  ////
////      - bin qiu, qiubin@opencores.org                         ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2011 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
 
//2011-8-7 18:57    initial revision
 
`include "defines.v"
 
module cavlc_fsm
(
    clk,
    rst_n,
    ena,
    start,
    max_coeff_num,
    TotalCoeff,
    TotalCoeff_comb,
    TrailingOnes,
    TrailingOnes_comb,
    ZeroLeft,
    state,
    i,
    idle,
    valid
);
//------------------------
//ports
//------------------------
input  clk;
input  rst_n;
input  ena;
input  start;
 
input  [4:0]  max_coeff_num;
input  [4:0]  TotalCoeff;
input  [4:0]  TotalCoeff_comb;
input  [1:0]  TrailingOnes;
input  [1:0]  TrailingOnes_comb;
input  [3:0]  ZeroLeft;
 
output [7:0]  state;
output [3:0]  i;
output idle;
output valid;
 
//------------------------
//FFs
//------------------------
reg  [7:0]  state;
reg  [3:0]  i;
reg  valid;
 
//------------------------
//state & i & valid
//------------------------
always @(posedge clk or negedge rst_n)
if (!rst_n) begin
    state   <= `cavlc_idle_s;
    i <= 0;
    valid <= 0;
end
else if (ena)
case(state)
    `cavlc_idle_s : begin
        if (start) begin
            state <= `cavlc_read_total_coeffs_s;
            valid <= 0;
        end
        else begin
            state <= `cavlc_idle_s;
        end
    end
    `cavlc_read_total_coeffs_s : begin
        i <= TotalCoeff_comb -1;
        if (TrailingOnes_comb > 0 && TotalCoeff_comb > 0)
            state <= `cavlc_read_t1s_flags_s;
        else if (TotalCoeff_comb > 0)
            state <= `cavlc_read_level_prefix_s;
        else begin
            state <= `cavlc_idle_s;
            valid <= 1;
        end
    end
    `cavlc_read_t1s_flags_s : begin
        if (TrailingOnes == TotalCoeff)
            state <= `cavlc_read_total_zeros_s;
        else begin
            state <= `cavlc_read_level_prefix_s;
            i <= i - TrailingOnes;
        end
    end
    `cavlc_read_level_prefix_s : begin
        state <= `cavlc_read_level_suffix_s;
    end
    `cavlc_read_level_suffix_s : begin
        state <= `cavlc_calc_level_s;
    end
    `cavlc_calc_level_s : begin
        if ( i == 0  && TotalCoeff < max_coeff_num)
            state <= `cavlc_read_total_zeros_s;
        else if (i == 0) begin
            state <= `cavlc_read_run_befores_s;
            i <= TotalCoeff - 1;
        end
        else begin
            state <= `cavlc_read_level_prefix_s;
            i <= i - 1;
        end
    end
    `cavlc_read_total_zeros_s : begin
        state <= `cavlc_read_run_befores_s;
        i <= TotalCoeff - 1;
    end
    `cavlc_read_run_befores_s : begin
        if (i == 0 || ZeroLeft == 0) begin
            state <= `cavlc_idle_s;
            valid <= 1;
        end
        else begin
            state <= `cavlc_read_run_befores_s;
            i <= i - 1;
        end
    end
endcase
 
assign idle = state[`cavlc_idle_bit];
 
endmodule
 

Line No.	Rev	Author	Line
1	7	qiubin	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// cavlc_fsm ////`
4			`//// ////`
5			`//// Description ////`
6			`//// controls the cavlc parsing process ////`
7			`//// ////`
8			`//// Author(s): ////`
9			`//// - bin qiu, qiubin@opencores.org ////`
10			`//// ////`
11			`//////////////////////////////////////////////////////////////////////`
12			`//// ////`
13			`//// Copyright (C) 2011 Authors and OPENCORES.ORG ////`
14			`//// ////`
15			`//// This source file may be used and distributed without ////`
16			`//// restriction provided that this copyright statement is not ////`
17			`//// removed from the file and that any derivative work contains ////`
18			`//// the original copyright notice and the associated disclaimer. ////`
19			`//// ////`
20			`//// This source file is free software; you can redistribute it ////`
21			`//// and/or modify it under the terms of the GNU Lesser General ////`
22			`//// Public License as published by the Free Software Foundation; ////`
23			`//// either version 2.1 of the License, or (at your option) any ////`
24			`//// later version. ////`
25			`//// ////`
26			`//// This source is distributed in the hope that it will be ////`
27			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
28			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
29			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
30			`//// details. ////`
31			`//// ////`
32			`//// You should have received a copy of the GNU Lesser General ////`
33			`//// Public License along with this source; if not, download it ////`
34			`//// from http://www.opencores.org/lgpl.shtml ////`
35			`//// ////`
36			`//////////////////////////////////////////////////////////////////////`
37	6	qiubin
38	7	qiubin	`//2011-8-7 18:57 initial revision`
39
40	6	qiubin	`include "defines.v"
41
42			`module cavlc_fsm`
43			`(`
44	7	qiubin	`clk,`
45			`rst_n,`
46			`ena,`
47			`start,`
48			`max_coeff_num,`
49			`TotalCoeff,`
50			`TotalCoeff_comb,`
51			`TrailingOnes,`
52			`TrailingOnes_comb,`
53			`ZeroLeft,`
54			`state,`
55			`i,`
56			`idle,`
57			`valid`
58	6	qiubin	`);`
59			`//------------------------`
60			`//ports`
61			`//------------------------`
62	7	qiubin	`input clk;`
63			`input rst_n;`
64			`input ena;`
65			`input start;`
66	6	qiubin
67	7	qiubin	`input [4:0] max_coeff_num;`
68			`input [4:0] TotalCoeff;`
69			`input [4:0] TotalCoeff_comb;`
70			`input [1:0] TrailingOnes;`
71			`input [1:0] TrailingOnes_comb;`
72			`input [3:0] ZeroLeft;`
73	6	qiubin
74	7	qiubin	`output [7:0] state;`
75			`output [3:0] i;`
76	6	qiubin	`output idle;`
77			`output valid;`
78
79			`//------------------------`
80			`//FFs`
81			`//------------------------`
82	7	qiubin	`reg [7:0] state;`
83			`reg [3:0] i;`
84			`reg valid;`
85	6	qiubin
86			`//------------------------`
87			`//state & i & valid`
88			`//------------------------`
89			`always @(posedge clk or negedge rst_n)`
90	7	qiubin	`if (!rst_n) begin`
91			state <= `cavlc_idle_s;
92			`i <= 0;`
93			`valid <= 0;`
94	6	qiubin	`end`
95			`else if (ena)`
96			`case(state)`
97	7	qiubin	`cavlc_idle_s : begin
98			`if (start) begin`
99			state <= `cavlc_read_total_coeffs_s;
100			`valid <= 0;`
101			`end`
102			`else begin`
103			state <= `cavlc_idle_s;
104			`end`
105			`end`
106			`cavlc_read_total_coeffs_s : begin
107			`i <= TotalCoeff_comb -1;`
108			`if (TrailingOnes_comb > 0 && TotalCoeff_comb > 0)`
109			state <= `cavlc_read_t1s_flags_s;
110			`else if (TotalCoeff_comb > 0)`
111			state <= `cavlc_read_level_prefix_s;
112			`else begin`
113			state <= `cavlc_idle_s;
114			`valid <= 1;`
115			`end`
116			`end`
117			`cavlc_read_t1s_flags_s : begin
118			`if (TrailingOnes == TotalCoeff)`
119			state <= `cavlc_read_total_zeros_s;
120			`else begin`
121			state <= `cavlc_read_level_prefix_s;
122			`i <= i - TrailingOnes;`
123			`end`
124			`end`
125			`cavlc_read_level_prefix_s : begin
126			state <= `cavlc_read_level_suffix_s;
127			`end`
128			`cavlc_read_level_suffix_s : begin
129			state <= `cavlc_calc_level_s;
130			`end`
131			`cavlc_calc_level_s : begin
132			`if ( i == 0 && TotalCoeff < max_coeff_num)`
133			state <= `cavlc_read_total_zeros_s;
134			`else if (i == 0) begin`
135			state <= `cavlc_read_run_befores_s;
136			`i <= TotalCoeff - 1;`
137			`end`
138			`else begin`
139			state <= `cavlc_read_level_prefix_s;
140			`i <= i - 1;`
141			`end`
142			`end`
143			`cavlc_read_total_zeros_s : begin
144			state <= `cavlc_read_run_befores_s;
145			`i <= TotalCoeff - 1;`
146			`end`
147			`cavlc_read_run_befores_s : begin
148			`if (i == 0 \|\| ZeroLeft == 0) begin`
149			state <= `cavlc_idle_s;
150			`valid <= 1;`
151			`end`
152			`else begin`
153			state <= `cavlc_read_run_befores_s;
154			`i <= i - 1;`
155			`end`
156			`end`
157	6	qiubin	`endcase`
158
159			assign idle = state[`cavlc_idle_bit];
160
161			`endmodule`
162

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[/] [cavlc/] [trunk/] [rtl/] [cavlc_fsm.v] - Blame information for rev 7