Tablica wartości komparatora scalonego 85
Tablica 4.26
|
Wejścia komparacyjne |
Wejścia do połączeń kaskadowych |
Wyjścia | |||||||
|
A 3, 83 |
A2, 82 |
Ai, 61 |
Ao, 80 |
A>B |
A<6 |
A = 8 |
A>6 |
A<B |
A=8 |
|
A3 > 83 |
X |
X |
X |
X |
X |
X |
H |
L |
L |
|
Aa < 83 |
X |
X |
X |
X |
X |
X |
L |
H |
i |
|
As = Bs |
A2 > 82 |
X |
X |
X |
X |
X |
H |
L |
L |
|
A3 = 83 |
A2 < 82 |
X |
X |
X |
X |
X |
L |
H |
L |
|
A3 = 83 |
A2 = 82 |
At > 81 |
X |
X |
X |
X |
H |
L |
L |
|
As = 83 |
A2 =3 82 |
Ai < 81 |
X |
X |
X |
X |
L |
H |
L |
|
As — 83 |
Aa = 82 |
At =81 |
Ao > 80 |
X |
X |
X |
H |
L |
L |
|
As = 83 |
As = 82 |
Ai = Bi |
Ao < 80 |
X |
X |
X |
L |
H |
L |
|
As = Ba |
Aa =3 82 |
At = Bi |
Ao = 80 |
H |
L |
L |
H |
L |
L |
|
As — 83 |
Aa = 82 |
At = Bi |
Ao = 60 |
L |
H |
L |
L |
H |
L |
|
As = Ba |
A2 = 82 |
At — 81 |
Ao = 80 |
L |
L |
H |
L |
L |
H |
funkcje przełączające otrzymane z tablicy wartości tego komparatora (tabl. 4.26):
(A > B)wy =
= (A3 < B3)-t-
+ (A3 — B3) (A2 < B^)Ą-
+ (-^3 = B3) (A2 == B2) (Ai < 2?i) +
+ (A3 — B3) (A2 = B2) (Ai — Bi) (A0 < 2?o) +
+ (^3 = B3) (A2 = B2) (Al = Bi) (A0 = Bo) (A < B)we +
+ (A3 = B3) (A2= B2) (Ai = Bi) (A0 - B0) (A = B)we (15)
Posługując się funkcjami podanymi w tablicy 4.24, równanie to można wyrazić w następującej postaci:
(A > B)wy =
= A 3 B3 +
+ (^30^3) A2B2 +
+ (A3QB3) (A2QB2)AiBi +
~^^A3QB3) (A2QB2) (AiOyBi^AoBo^
+ (A3QB3) (A2OB2) (A1OB1) (A0OB0) (A < B)we +
+ (A3QB3) (A2QB2) (AiOBi) (A0OB0) (A - B)we (16)
lub
(A > B)wy =
_ 3 — i — A3B3+ LJ \A3-tB3-i O (^-jO^-i)]“b
/=1 j»l
+ (A <B)we Pi (AtOBt) + (A =B)we H (A&Bd (17)