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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
|
--------------------------------------------------------------------------
-- --
-- Copyright (c) 1990, 1991, 1992 by Synopsys, Inc. --
-- All rights reserved. --
-- --
-- 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 this copyright notice. --
-- --
-- Package name: STD_LOGIC_SIGNED --
-- --
-- --
-- Date: 09/11/91 KN --
-- 10/08/92 AMT change std_ulogic to signed std_logic --
-- 10/28/92 AMT added signed functions, -, ABS --
-- --
-- Purpose: --
-- A set of signed arithemtic, conversion, --
-- and comparision functions for STD_LOGIC_VECTOR. --
-- --
-- Note: Comparision of same length std_logic_vector is defined --
-- in the LRM. The interpretation is for unsigned vectors --
-- This package will "overload" that definition. --
-- --
--------------------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
package STD_LOGIC_SIGNED is
function "+"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "+"(L: STD_LOGIC_VECTOR; R: INTEGER) return STD_LOGIC_VECTOR;
function "+"(L: INTEGER; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "+"(L: STD_LOGIC_VECTOR; R: STD_LOGIC) return STD_LOGIC_VECTOR;
function "+"(L: STD_LOGIC; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "-"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "-"(L: STD_LOGIC_VECTOR; R: INTEGER) return STD_LOGIC_VECTOR;
function "-"(L: INTEGER; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "-"(L: STD_LOGIC_VECTOR; R: STD_LOGIC) return STD_LOGIC_VECTOR;
function "-"(L: STD_LOGIC; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "+"(L: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "-"(L: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "ABS"(L: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "*"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "<"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "<"(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN;
function "<"(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "<="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "<="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN;
function "<="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN;
function ">"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN;
function ">"(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN;
function ">"(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN;
function ">="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN;
function ">="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN;
function ">="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN;
function "="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "/="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN;
function "/="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN;
function "/="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN;
function SHL(ARG:STD_LOGIC_VECTOR;COUNT: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function SHR(ARG:STD_LOGIC_VECTOR;COUNT: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function CONV_INTEGER(ARG: STD_LOGIC_VECTOR) return INTEGER;
-- remove this since it is already in std_logic_arith
-- function CONV_STD_LOGIC_VECTOR(ARG: INTEGER; SIZE: INTEGER) return STD_LOGIC_VECTOR;
end STD_LOGIC_SIGNED;
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
package body STD_LOGIC_SIGNED is
function maximum(L, R: INTEGER) return INTEGER is
begin
if L > R then
return L;
else
return R;
end if;
end;
function "+"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
constant length: INTEGER := maximum(L'length, R'length);
variable result : STD_LOGIC_VECTOR (length-1 downto 0);
begin
result := SIGNED(L) + SIGNED(R); -- pragma label plus
return std_logic_vector(result);
end;
function "+"(L: STD_LOGIC_VECTOR; R: INTEGER) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := SIGNED(L) + R; -- pragma label plus
return std_logic_vector(result);
end;
function "+"(L: INTEGER; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
variable result : STD_LOGIC_VECTOR (R'range);
begin
result := L + SIGNED(R); -- pragma label plus
return std_logic_vector(result);
end;
function "+"(L: STD_LOGIC_VECTOR; R: STD_LOGIC) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := SIGNED(L) + R; -- pragma label plus
return std_logic_vector(result);
end;
function "+"(L: STD_LOGIC; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
variable result : STD_LOGIC_VECTOR (R'range);
begin
result := L + SIGNED(R); -- pragma label plus
return std_logic_vector(result);
end;
function "-"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
constant length: INTEGER := maximum(L'length, R'length);
variable result : STD_LOGIC_VECTOR (length-1 downto 0);
begin
result := SIGNED(L) - SIGNED(R); -- pragma label minus
return std_logic_vector(result);
end;
function "-"(L: STD_LOGIC_VECTOR; R: INTEGER) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := SIGNED(L) - R; -- pragma label minus
return std_logic_vector(result);
end;
function "-"(L: INTEGER; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
variable result : STD_LOGIC_VECTOR (R'range);
begin
result := L - SIGNED(R); -- pragma label minus
return std_logic_vector(result);
end;
function "-"(L: STD_LOGIC_VECTOR; R: STD_LOGIC) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := SIGNED(L) - R; -- pragma label minus
return std_logic_vector(result);
end;
function "-"(L: STD_LOGIC; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
variable result : STD_LOGIC_VECTOR (R'range);
begin
result := L - SIGNED(R); -- pragma label minus
return std_logic_vector(result);
end;
function "+"(L: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := + SIGNED(L); -- pragma label plus
return std_logic_vector(result);
end;
function "-"(L: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := - SIGNED(L); -- pragma label minus
return std_logic_vector(result);
end;
function "ABS"(L: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
variable result : STD_LOGIC_VECTOR (L'range);
begin
result := ABS( SIGNED(L));
return std_logic_vector(result);
end;
function "*"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- pragma label_applies_to mult
constant length: INTEGER := maximum(L'length, R'length);
variable result : STD_LOGIC_VECTOR ((L'length+R'length-1) downto 0);
begin
result := SIGNED(L) * SIGNED(R); -- pragma label mult
return std_logic_vector(result);
end;
function "<"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to lt
constant length: INTEGER := maximum(L'length, R'length);
begin
return SIGNED(L) < SIGNED(R); -- pragma label lt
end;
function "<"(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to lt
begin
return SIGNED(L) < R; -- pragma label lt
end;
function "<"(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to lt
begin
return L < SIGNED(R); -- pragma label lt
end;
function "<="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to leq
begin
return SIGNED(L) <= SIGNED(R); -- pragma label leq
end;
function "<="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to leq
begin
return SIGNED(L) <= R; -- pragma label leq
end;
function "<="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to leq
begin
return L <= SIGNED(R); -- pragma label leq
end;
function ">"(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to gt
begin
return SIGNED(L) > SIGNED(R); -- pragma label gt
end;
function ">"(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to gt
begin
return SIGNED(L) > R; -- pragma label gt
end;
function ">"(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to gt
begin
return L > SIGNED(R); -- pragma label gt
end;
function ">="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to geq
begin
return SIGNED(L) >= SIGNED(R); -- pragma label geq
end;
function ">="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to geq
begin
return SIGNED(L) >= R; -- pragma label geq
end;
function ">="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN is
-- pragma label_applies_to geq
begin
return L >= SIGNED(R); -- pragma label geq
end;
function "="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN is
begin
return SIGNED(L) = SIGNED(R);
end;
function "="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN is
begin
return SIGNED(L) = R;
end;
function "="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN is
begin
return L = SIGNED(R);
end;
function "/="(L: STD_LOGIC_VECTOR; R: STD_LOGIC_VECTOR) return BOOLEAN is
begin
return SIGNED(L) /= SIGNED(R);
end;
function "/="(L: STD_LOGIC_VECTOR; R: INTEGER) return BOOLEAN is
begin
return SIGNED(L) /= R;
end;
function "/="(L: INTEGER; R: STD_LOGIC_VECTOR) return BOOLEAN is
begin
return L /= SIGNED(R);
end;
function SHL(ARG:STD_LOGIC_VECTOR;COUNT: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
begin
return STD_LOGIC_VECTOR(SHL(SIGNED(ARG),UNSIGNED(COUNT)));
end;
function SHR(ARG:STD_LOGIC_VECTOR;COUNT: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
begin
return STD_LOGIC_VECTOR(SHR(SIGNED(ARG),UNSIGNED(COUNT)));
end;
-- This function converts std_logic_vector to a signed integer value
-- using a conversion function in std_logic_arith
function CONV_INTEGER(ARG: STD_LOGIC_VECTOR) return INTEGER is
variable result : SIGNED(ARG'range);
begin
result := SIGNED(ARG);
return CONV_INTEGER(result);
end;
end STD_LOGIC_SIGNED;
|
