MAS2901CS datasheet(6/13 Pages) ZARLINK

6 / 13 page

MA2901

Octal

Cn=0(Low)

Cn = 1 (High)

I 5,4,3/I 2,1,0

Group

Function

Group

Function

ADD

A + Q

A + B

D + A

D + Q

ADD

plus one

A + Q +1

A + B +1

D + A +1

D + Q + 1

PASS

Increment

Q +1

B + 1

A + 1

D + 1

Decrement

Q - 1

B - 1

A - 1

D - 1

PASS

1s comp

- Q - 1

- B - 1

- A - 1

- D - 1

2s comp

(negate)

- Q

- B

- A

- D

SUBTRACT

(1s comp)

Q - A -1

B - A-1

A - D-1

Q - D-1

A - Q-1

A - B-1

D - A-1

D - Q-1

SUBTRACT

(2s comp)

Q - A

B - A

A - D

Q - D

A - Q

A - B

D - A

D - Q

Octal

I 5,4,3 /I 2,1,0

Group

Function

AND

Λ Q

Λ B

Λ A

Λ Q

A V Q

A V B

D V A

D V Q

EX-OR

∇ Q

∇ B

∇ A

∇ Q

EX-NOR

∇ QN

∇ BN

∇ AN

∇ QN

INVERT

PASS

‘ZERO’

AND

Λ Q

Λ B

Λ A

Λ Q

+ = plus; - = minus; V = OR; Λ = AND; ∇ = EX-OR

Figure 6: ALU Logic Mode Functions (Cn Irrelevant)

Figure 7: ALU Arithmetic Mode Functions

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