The Digital Logic Level (4)

FloydFloydDigital Fundamentals, 9/eDigital Fundamentals, 9/e

The Digital Logic Level (4)The Digital Logic Level (4)

Ass. Prof. Dr. Masri Ayob

TK6123 : Lecture 16

Encoders: Decimal-to-BCD EncoderEncoders: Decimal-to-BCD Encoder

Encoders Encoders

• 8-line-to-3-line encoder8-line-to-3-line encoder

Code ConvertersCode Converters: : BCD-to-binary conversionBCD-to-binary conversion

Multiplexers (Data Selectors)Multiplexers (Data Selectors)

• 4-input multiplexer4-input multiplexer

Multiplexers (Data Selectors)Multiplexers (Data Selectors)

• Expanded multiplexersExpanded multiplexers

DemultiplexersDemultiplexers

• 2-line-to-4-line demux2-line-to-4-line demux

ClocksClocks

(a) A clock.(a) A clock.(b) The timing diagram for the clock.(b) The timing diagram for the clock.(c) Generation of an asymmetric clock.(c) Generation of an asymmetric clock.

Latches (3)Latches (3)

A clocked D latch.A clocked D latch.

Flip-Flops (1)Flip-Flops (1)

(a) A pulse generator.(a) A pulse generator.(b) Timing at four points in the circuit.(b) Timing at four points in the circuit.

D flip-flopD flip-flop

D latches and flip-flops.D latches and flip-flops.

Dual D flip-flop.Dual D flip-flop.

Memory Memory Organization (1)Organization (1)

Logic diagram for Logic diagram for a a

4 x 3 memory. 4 x 3 memory.

Each row is one Each row is one of the four 3-of the four 3-bit words. bit words.

Thank youThank youQ&AQ&A

The Digital Logic Level (4)

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Copyright 2005 Curt Hill Gates and Low Level Digital Logic