MC10H165

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4

APPLICATION INFORMATION

A typical application of the MC10H165 is the decoding of

system status on a priority basis. A 64−line priority encoder

is shown in the figure below. System status lines are

connected to this encoder such that, when a given condition

exists, the respective input will be at a logic high level. This

scheme will select the one of 64 different system conditions,

as represented at the encoder inputs, which has priority in

determining the next system operation to be performed. The

binary code showing the address of the highest priority input

present will appear at the encoder outputs to control other

system logic functions.

Q2

Six bit output

word yielding

number of

highest priority

channel present

at input

ZZZ

MC10H164

MC10H164

MC10H164

X0

X7

. . . . . . .

A B C

C

D0

D7

Q0

Q1

Q2

LSB

MSB

C

D0

D7

Q0

Q1

Q2

Q3

C

D0

D7

C

D0

D7

C

D0

D7

C

D0

D7

C

D0

D7

C

D0

D7

C

D0

D7

Q0

Q1

Q2

Q3

Q0

Q1

Q2

Q3

Q0

Q1

Q2

Q3

Q0

Q1

Q2

Q3

Q0

Q1

Q2

Q3

Q0

Q1

Q2

Q3

Q0

Q3

1/2 MC10H101

System

Clock

Highest

Priority

Input

Lowest

Priority

Input

64−LINE PRIORITY ENCODER

X0

X7

. . . . . . .

A B C

X0

X7

. . . . . . .

A B C

Q1