-
Notifications
You must be signed in to change notification settings - Fork 0
/
SBdecoder.v
146 lines (120 loc) · 3.84 KB
/
SBdecoder.v
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 17.09.2017 14:06:56
// Design Name:
// Module Name: SBdecoder
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module SBdecoder(
sb_clk,
sb_resetn,
sb_addr,
sb_size,
sb_sel_s1,
sb_sel_s2,
sb_sel_s3,
add_notokay,
sb_resp
);
//---------------------------------------------------------------------------------------------------------------------
// parameter definitionsendmodule
//---------------------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------------------
// localparam definitions
//---------------------------------------------------------------------------------------------------------------------
localparam SB_ADDR_WIDTH = 32;
localparam HIGH_BIT = 30;
localparam BIT_WIDTH = 2;
localparam ADD1_WIDTH = 30;
localparam ADD2_WIDTH = 30;
localparam SB_RESP_TYPE = 2;
localparam SB_TRANS_SIZE = 3;
localparam RESP_STATE_WIDTH = 2;
localparam [RESP_STATE_WIDTH-1:0] ERROR = 2;
//---------------------------------------------------------------------------------------------------------------------
// I/O signals
//---------------------------------------------------------------------------------------------------------------------
input [SB_ADDR_WIDTH-1:0] sb_addr;
input sb_clk;
input sb_resetn;
input [SB_TRANS_SIZE-1:0] sb_size;
output reg sb_sel_s1;
output reg sb_sel_s2;
output reg sb_sel_s3;
output reg add_notokay;
output reg [SB_RESP_TYPE-1:0] sb_resp;
reg [ADD1_WIDTH-1:0] num_beat;
reg [ADD2_WIDTH-1:0] num_beat2;
always @(posedge sb_clk)begin
if(!sb_resetn) begin
sb_sel_s1 <= 1'b0;
sb_sel_s2 <= 1'b0;
sb_sel_s3 <= 1'b0;
add_notokay <= 1'b0;
sb_resp <= {SB_RESP_TYPE*{1'b0}};
num_beat <= {ADD1_WIDTH*{1'b0}};
num_beat2 <= {ADD2_WIDTH*{1'b0}};
end
else begin
case(sb_size)
3'b010 : num_beat <= 30'd0;
3'b011 : num_beat <= 30'd1;
3'b100 : num_beat <= 30'd3;
3'b101 : num_beat <= 30'd7;
3'b110 : num_beat <= 30'd15;
3'b111 : num_beat <= 30'd31;
endcase
if(sb_addr[HIGH_BIT+:BIT_WIDTH]==2'b01)begin
if(sb_addr[0+:ADD1_WIDTH]+num_beat > 30'd2047)begin
sb_resp <= ERROR;
add_notokay <= 1'b1;
sb_sel_s1 <= 1'b0;
end
else begin
add_notokay <= 1'b0;
sb_sel_s1 <= 1'b1;
end
end
else if(sb_addr[HIGH_BIT+:BIT_WIDTH]==2'b10)begin
if(sb_addr[0+:ADD1_WIDTH]+num_beat>30'd2047)begin
sb_resp <= ERROR;
add_notokay <= 1'b1;
sb_sel_s2 <= 1'b0;
end
else begin
add_notokay <= 1'b0;
sb_sel_s2 <= 1'b1;
end
end
else if(sb_addr[HIGH_BIT+:BIT_WIDTH]==2'b11) begin
if(sb_addr[0+:ADD2_WIDTH]+num_beat2>30'd4095)begin
sb_resp <= ERROR;
add_notokay <= 1'b1;
sb_sel_s3 <= 1'b0;
end
else begin
add_notokay <= 1'b0;
sb_sel_s3 <= 1'b1;
end
end
else begin
sb_sel_s1 <= 1'b0;
sb_sel_s2 <= 1'b0;
sb_sel_s3 <= 1'b0;
end
end
end
endmodule