Image326

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

3    3

+ (A <B)_we Pi (A_tOB_t) + (A =B)_we H (A&Bd    (17)