Digital Logic Design (DLD) – Complete Study Notes (Units 1–6)Free

Comprehensive study material covering digital number systems, Boolean algebra, logic gates, combinational logic circuits, sequential circuits, registers, counters, finite state machines and digital memory systems.

Unit 1 – Number Systems and Codes

• Introduction to digital logic design

• Analog and digital signals

• Binary, decimal, octal and hexadecimal number systems

• Number system conversions

• Binary addition, subtraction, multiplication and division

• Signed number representation

• 1's and 2's complement

• Binary codes: BCD, Gray code and Excess-3

• Error-detecting codes

• ASCII and alphanumeric codes

Unit 2 – Boolean Algebra and Logic Gates

• Boolean algebra laws and theorems

• De Morgan's theorems

• Basic logic gates: AND, OR and NOT

• Universal gates: NAND and NOR

• XOR and XNOR gates

• Truth tables and Boolean expressions

• Canonical SOP and POS forms

• Minterms and maxterms

• Boolean function simplification

• Karnaugh maps (K-maps)

• Don't-care conditions

• Logic circuit implementation

Unit 3 – Combinational Logic Circuits

• Introduction to combinational circuits

• Half adder and full adder

• Half subtractor and full subtractor

• Parallel binary adders

• Carry look-ahead adders

• Multiplexers and demultiplexers

• Encoders and decoders

• Priority encoders

• Magnitude comparators

• Code converters

• Parity generators and checkers

• Arithmetic logic circuits

Unit 4 – Sequential Logic Circuits

• Introduction to sequential circuits

• Latches and flip-flops

• SR, JK, D and T flip-flops

• Characteristic and excitation tables

• Flip-flop conversions

• Clock signals and triggering

• Setup time and hold time

• Race-around condition

• Master-slave flip-flops

• Registers and shift registers

• Serial and parallel data transfer

Unit 5 – Counters and Finite State Machines

• Asynchronous and synchronous counters

• Up counters and down counters

• Up/down counters

• Modulo-N counters

• Ring counters and Johnson counters

• Counter design techniques

• State diagrams and state tables

• Mealy and Moore machines

• State minimization and assignment

• Sequence detectors

• Finite State Machine (FSM) design

• Timing diagrams and circuit analysis

Unit 6 – Memory and Programmable Logic Devices

• Digital memory fundamentals

• RAM and ROM

• SRAM and DRAM

• PROM, EPROM and EEPROM

• Memory organization and capacity

• Memory expansion and interfacing

• Programmable Logic Devices (PLDs)

• Programmable Logic Array (PLA)

• Programmable Array Logic (PAL)

• CPLDs and FPGAs

• Introduction to Verilog HDL

• Basic digital circuit implementation using HDL

Learning Outcomes

• Understand number systems and digital codes.

• Simplify Boolean expressions and design logic circuits.

• Analyze combinational and sequential circuits.

• Design counters, registers and finite state machines.

• Understand digital memory and programmable logic devices.

• Practice truth tables, circuit diagrams and numerical problems.

This study material is useful for class preparation, assignments, practical learning, revision and semester examination preparation.

Note: The six-unit outline is a general reference. Topics may differ according to your university syllabus.