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[/] [cavlc/] [trunk/] [rtl/] [cavlc_fsm.v] - Blame information for rev 6

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//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)         //TotalCoeff should not be larger than max_coeff_num
                        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	6	qiubin	`//2011-8-7 18:57 initial revision`
2
3			`include "defines.v"
4
5			`module cavlc_fsm`
6			`(`
7			`clk,`
8			`rst_n,`
9			`ena,`
10			`start,`
11			`max_coeff_num,`
12			`TotalCoeff,`
13			`TotalCoeff_comb,`
14			`TrailingOnes,`
15			`TrailingOnes_comb,`
16			`ZeroLeft,`
17			`state,`
18			`i,`
19			`idle,`
20			`valid`
21			`);`
22			`//------------------------`
23			`//ports`
24			`//------------------------`
25			`input clk;`
26			`input rst_n;`
27			`input ena;`
28			`input start;`
29
30			`input [4:0] max_coeff_num;`
31			`input [4:0] TotalCoeff;`
32			`input [4:0] TotalCoeff_comb;`
33			`input [1:0] TrailingOnes;`
34			`input [1:0] TrailingOnes_comb;`
35			`input [3:0] ZeroLeft;`
36
37			`output [7:0] state;`
38			`output [3:0] i;`
39			`output idle;`
40			`output valid;`
41
42			`//------------------------`
43			`//FFs`
44			`//------------------------`
45			`reg [7:0] state;`
46			`reg [3:0] i;`
47			`reg valid;`
48
49			`//------------------------`
50			`//state & i & valid`
51			`//------------------------`
52			`always @(posedge clk or negedge rst_n)`
53			`if (~rst_n) begin`
54			state <= `cavlc_idle_s;
55			`i <= 0;`
56			`valid <= 0;`
57			`end`
58			`else if (ena)`
59			`case(state)`
60			`cavlc_idle_s : begin
61			`if (start) begin`
62			state <= `cavlc_read_total_coeffs_s;
63			`valid <= 0;`
64			`end`
65			`else begin`
66			state <= `cavlc_idle_s;
67			`end`
68			`end`
69			`cavlc_read_total_coeffs_s : begin
70			`i <= TotalCoeff_comb -1;`
71			`if (TrailingOnes_comb > 0 && TotalCoeff_comb > 0)`
72			state <= `cavlc_read_t1s_flags_s;
73			`else if (TotalCoeff_comb > 0)`
74			state <= `cavlc_read_level_prefix_s;
75			`else begin`
76			state <= `cavlc_idle_s;
77			`valid <= 1;`
78			`end`
79			`end`
80			`cavlc_read_t1s_flags_s : begin
81			`if (TrailingOnes == TotalCoeff) //TotalCoeff should not be larger than max_coeff_num`
82			state <= `cavlc_read_total_zeros_s;
83			`else begin`
84			state <= `cavlc_read_level_prefix_s;
85			`i <= i - TrailingOnes;`
86			`end`
87			`end`
88			`cavlc_read_level_prefix_s : begin
89			state <= `cavlc_read_level_suffix_s;
90			`end`
91			`cavlc_read_level_suffix_s : begin
92			state <= `cavlc_calc_level_s;
93			`end`
94			`cavlc_calc_level_s : begin
95			`if ( i == 0 && TotalCoeff < max_coeff_num)`
96			state <= `cavlc_read_total_zeros_s;
97			`else if (i == 0) begin`
98			state <= `cavlc_read_run_befores_s;
99			`i <= TotalCoeff - 1;`
100			`end`
101			`else begin`
102			state <= `cavlc_read_level_prefix_s;
103			`i <= i - 1;`
104			`end`
105			`end`
106			`cavlc_read_total_zeros_s : begin
107			state <= `cavlc_read_run_befores_s;
108			`i <= TotalCoeff - 1;`
109			`end`
110			`cavlc_read_run_befores_s : begin
111			`if (i == 0 \|\| ZeroLeft == 0) begin`
112			state <= `cavlc_idle_s;
113			`valid <= 1;`
114			`end`
115			`else begin`
116			state <= `cavlc_read_run_befores_s;
117			`i <= i - 1;`
118			`end`
119			`end`
120			`endcase`
121
122			assign idle = state[`cavlc_idle_bit];
123
124			`endmodule`
125

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[/] [cavlc/] [trunk/] [rtl/] [cavlc_fsm.v] - Blame information for rev 6