mc14560b Freescale Semiconductor, Inc, mc14560b Datasheet - Page 11

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mc14560b

Manufacturer Part Number
mc14560b
Description
Nbcd Adder
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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B S = (Add/Sub)
A S = Sign of A (“1” = Negative)
B S = Sign of B (“1” = Negative)
C out = Adder Carry Out
MOTOROLA CMOS LOGIC DATA
A S
0
0
1
1
0
0
1
1
Inputs
B S
0
1
0
1
0
1
0
1
TRUTH TABLE
C out
B S
0
0
0
0
1
1
1
1
EAC
0
0
0
1
0
1
1
1
Outputs
SGN
0
1
1
1
0
0
0
1
Figure 10. Mapping of EAC, Sign and Overflow Logic
OVF
0
0
0
1
1
0
0
0
C out
End Around Carry
* = Center of Symmetry
0*
0
1
0
0
1
0
0
EAC
EAC = S2 (A S B S C out ) + S3 (A S B S C out )
SGN = S2 (A S B S C out ) + S3 (A S B S C out )
1
1
1
0
1
1
1
0
A S
= M 3 (A S B S C out )
= M 3 (A S B S C out )
B S
C out
KARNAUGH MAPS
0*
1
0
0
0
1
1
0
Sign (SGN)
C out
A S
1
1
0
1
0
1
1
0
B S
=
=
C out
Overflow (OVF)
0
0
1
0
0
0
1
0
OVF
MC14560B
1
0
0
0
1
0
0
0
A S
B S
11

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