Digital Design
— Pinciples and Practices
Teacher：张鹰
Email,zhangyin@uestc.edu.
Chapter 1,Introduction
From Analog to Digital
Digital circuits and devices
Design for IC
The target of the text
The arrangement of the text
From Analog to Digital
Sampling— hold— change to digital
Sampling in discrete time
Record in limited words in binary system
Digital circuit
Digital signal value,the string of 1 and 0
1,the power source or High voltage;
0,the ground or Low voltage;
A node in circuit can get 1 or 0 through
switches from the power or the ground;
Digital circuit
A node in circuit can get voltage (1 or 0) through
switches from the power or the ground;
The states of the switch
Basic logic in digital design
AND gate
21 xxy
diagram
equation
Truth table
Three forms of a logic
Basic devices in digital circuit
OR gate
21 xxy
Basic devices in digital circuit
NOT gate (inverter,INV)
xy
Other Basic devices
NAND
'baf
NOR XOR
'baf baf
Two classes of digital circuit
the output depend
only on current
inputs,no memory
the output depend on
inputs and states,with
memory by feedback
Combinational circuit Sequential circuit
The integrated circuit,IC
SSI,1 to 20 gates; simple devices 60s
MSI,20 to 200 gates; functional devices 70s
LSI,200 to 200 000 gates;
complex devices or simple systems 80s
VLSI,? systems on chip (SOC) 90s
Moore’s law,Doubling in every 18 months
Design for IC
Application Specific ICs( ASIC):
based on standard cell and IP core;
Semicustom IC:
based on gate array;
Programmable Logic Devices(PLD):
CPLD,based on AND-OR circuits;
FPGA,based on looking up tables (LUTs);
Design level and step
Design level,Top-down
System design
functional design
gates design
transistor design
physical design
Step:
design with basic principles and HDL;
simulation;
synthesis;
verification;
The target of the text
Study basic concepts and basic
principles for digital design;
From gates design to functional
design.
The arrangement of the text
Teach in 32 times:
Arithmetic and device
Char.1,2,3 7
Combinational circuit
Char.4,5 10
Sequential circuit
Char.7,8 13
Memory and ADC/DAC 2
Excises and Exams,100
Problem in class,10
Home work,6
Test in class,4
Middle exam,20
Final exam,60