Digital Logic Design Notes

UNIT I -MINIMIZATION TECHNIQUES AND LOGIC GATES 
Minimization Techniques: Boolean postulates and laws – De-Morgan‟s Theorem -Principle of Duality – Boolean expression – Minimization of Boolean expressions ––
Minterm – Maxterm – Sum of Products (SOP) – Product of Sums (POS) – Karnaugh map Minimization – Don‟t care conditions – Quine – Mc Cluskey method of minimization.Logic Gates: AND, OR, NOT, NAND, NOR, Exclusive–OR and Exclusive–NOR Implementations of Logic Functions using gates, NAND–NOR implementations – Multi  level gate implementations- Multi output gate implementations. TTL and CMOS Logic and their characteristics – Tristate gates

UNIT II- COMBINATIONAL CIRCUITS 

Design procedure – Half adder – Full Adder – Half subtractor – Full subtractor – Parallel binary adder, parallel binary Subtractor – Fast Adder – Carry Look Ahead adder – Serial Adder/Subtractor – BCD adder – Binary Multiplier – Binary Divider – Multiplexer/ Demultiplexer – decoder – encoder – parity checker – parity generators – code converters – Magnitude Comparator.

UNIT III- SEQUENTIAL CIRCUITS 
Latches, Flip-flops – SR, JK, D, T, and Master-Slave – Characteristic table and equation –Application table – Edge triggering – Level Triggering – Realization of one flip flopusing other flip flops – serial adder/subtractor- Asynchronous Ripple or serial counter –Asynchronous Up/Down counter – Synchronous counters – Synchronous Up/Down counters – Programmable counters – Design of Synchronous counters: state diagram- State table –State minimization –State assignment – Excitation table and maps-Circuit implementation – Modulo–n counter, Registers – shift registers – Universal shift registers – Shift register counters – Ring counter – Shift counters – Sequence generators.
UNIT IV- MEMORY DEVICES 
Classification of memories – ROM – ROM organization – PROM – EPROM – EEPROM –EAPROM, RAM – RAM organization – Write operation – Read operation – Memory
cycle – Timing wave forms – Memory decoding – memory expansion – Static RAM Cell-Bipolar RAM cell – MOSFET RAM cell – Dynamic RAM cell –Programmable Logic
Devices – Programmable Logic Array (PLA) – Programmable Array Logic (PAL) – Field Programmable Gate Arrays (FPGA) – Implementation of combinational logic circuits using ROM, PLA, PAL

UNIT V- SYNCHRONOUS AND ASYNCHRONOUS SEQUENTIAL CIRCUITS

Synchronous Sequential Circuits: General Model – Classification – Design – Use of Algorithmic State Machine – Analysis of Synchronous Sequential Circuits
Asynchronous Sequential Circuits: Design of fundamental mode and pulse mode circuits – Incompletely specified State Machines – Problems in Asynchronous Circuits –Design of Hazard Free Switching circuits. Design of Combinational and Sequential circuits using VERILOG.