Digital Logic : Digital Logic Binary system -- 0 & 1, LOW & HIGH, negated and asserted.
Basic building blocks -- AND, OR, NOT
Nand and X-or Gates : Nand and X-or Gates
MOS Transistors : MOS Transistors Voltage-controlled resistance PMOS NMOS
CMOS Inverter : CMOS Inverter
Flip-flops : Flip-flops S-R latch symbols D flip-flop J-K flip-flops
Flip-flops : Flip-flops A device that stores either a 0 or 1.
Stored value can be changed only at certain times determined by a clock input.
New value depend on the current state and it’s control inputs
A digital circuit that contains filp-flops is called a sequential circuit.
Integrated Circuits : Integrated Circuits A collection of one or more gates fabricated on a single silicon chip is called an integrated circuit (IC).
ICs were classified by size:
SSI - small scale integration - 1~20 gates
MSI - medium scale integration - 20~200 gates
LSI - large scale integration - 200~200,000 gates
VLSI - very large scale integration - over 1M transistors
Pentium-III - 40 million transistors
Digital Design Levels : Digital Design Levels The lowest level of design is device physics and IC manufacturing processes.
Design at the transistor level
Level of functional building blocks
Level of logic design using HDLs
Computer design and overall system design.