1 library IEEE;
2 use IEEE.STD_LOGIC_1164.
ALL;
3 use IEEE.MATH_REAL.
ALL;
4
5 entity real_demo
is
6 end real_demo;
7
8 architecture Behavioral
of real_demo
is
9
10 --signals declared
with the
REAL data
type.
11 --MATH_PI
is a
constant defined
in the math_real
package.
12 signal X :
real := -MATH_PI/
3.0; --A
real variable X, initialized
to pi/
3(
60 degreee).
13 signal sign_result,ceil_result,floor_result,round_result,trunc_result :
real :=
0.0;
14 signal max,min,root,cube,power1,power2,exp_result :
real :=
0.0;
15 signal log_result,log2_result,log10_result,log_result2,sine,cosine,tangent :
real :=
0.0;
16 signal sin_inv,cos_inv,tan_inv,sin_hyp,cos_hyp,tan_hyp :
real :=
0.0;
17 signal inv_sin_hyp,inv_cos_hyp,inv_tan_hyp :
real :=
0.0;
18
19 begin
20
21 process
22 begin
23
24 sign_result <= SIGN(X); --sign
of X
25 ceil_result <= CEIL(X); --smallest
integer value
not less than X
26 floor_result <= FLOOR(X); --largest
integer value
not greater than X
27 round_result <= ROUND(X); --round
to the nearest
integer.
28 trunc_result <= TRUNC(X); --
truncation.
29 max <= REALMAX(
4.5,
4.6); --
return the maximum
30 min <= REALMIN(
2.3,
3.2); --
return the minimum
31 root <= SQRT(
4.0); --
square root
32 cube <= CBRT(
64.0); --
cube root
33 power1 <=
2**
3.0; --power
of an
integer
34 power2 <=
3.0**
3.0; --power
of a
real
35 exp_result <= EXP(
1.0); --returns e**
X.
36 log_result <= LOG(
2.73); --
natural logarithm
37 log2_result <= LOG2(
16.0); --log
to the base
2.
38 log10_result <= LOG10(
100.0); --log
to the base
10.
39 log_result2 <= LOG(
27.0,
3.0); --log
to the given base.
40 sine <= SIN(X); --sine
of the given angle(
in rad)
41 cosine <= COS(X);--cosine
of the given angle(
in rad)
42 tangent <= TAN(X);--tangent
of the given angle(
in rad)
43 sin_inv <= ARCSIN(SIN(X)); --
sine inverse.
44 cos_inv <= ARCCOS(COS(X)); --
cosine inverse.
45 tan_inv <= ARCTAN(TAN(X)); --
tangent inverse.
46 sin_hyp <= SINH(X); --
Hyperbolic sine
47 cos_hyp <= COSH(X); --
Hyperbolic cosine.
48 tan_hyp <= TANH(X); --
Hyperbolic tangent.
49 inv_sin_hyp <= ARCSINH(SINH(X)); --
Inverse hyperbolic sine.
50 inv_cos_hyp <= ARCCOSH(COSH(X)); --
Inverse hyperbolic cosine.
51 inv_tan_hyp <= ARCTANH(TANH(X)); --
Inverse hyperbolic tangent.
52 wait;
53
54 end process;
55
56 end Behavioral;
转载于:https://www.cnblogs.com/shangdawei/archive/2012/05/13/2498037.html
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