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# digital logic design number system

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Logic Design 2009
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# digital logic design number system

number system in digital logic design

number system in digital logic design

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### digital logic design number system

1. 1. 1 Digital Logic Design
2. 2. 2 Digital Logic Design ° Digital - Concerned with the interconnection among digital components and modules » Best Digital System example is General Purpose Computer ° Logic Design - Deals with the basic concepts and tools used to design digital hardware consisting of logic circuits » Circuits to perform arithmetic operations (+, -, x, ÷)
3. 3. 3 DigiDigi taltal SigSig nalsnals ° Decimal values are difficult to represent in electrical systems. It is easier to use two voltage values than ten. ° Digital Signals have two basic states: 1 (logic “high”, or H, or “on”) 0 (logic “low”, or L, or “off”) ° Digital values are in a binary format. Binary means 2 states. ° A good example of binary is a light (only on or off) on off Power switches have labels “1” for on and “0” for off.
4. 4. 4 Digital Logic Design ° Bits and Pieces of DLD History ° George Boole - Mathematical Analysis of Logic (1847) - An Investigation of Laws of Thoughts; Mathematical Theories of Logic and Probabilities (1854) ° Claude Shannon - Rediscovered the Boole - “ A Symbolic Analysis of Relay and Switching Circuits “ - Boolean Logic and Boolean Algebra were Applied to Digital Circuitry ---------- Beginning of the Digital Age and/or Computer Age World War II Computers as Calculating Machines Arlington (State Machines) “ Control “
5. 5. 5 Motivation ° Microprocessors/Microelectronics have revolutionized our world • Cell phones, internet, rapid advances in medicine, etc. ° The semiconductor industry has grown tremendously
6. 6. 6 Objectives ° Number System, Their Uses, Conversions ° Basic Building Blocks of Digital System ° Minimization ° Combinational And Sequential Logic ° Digital System/Circuit Analysis and Design ° State Minimizations ° Integrated Circuits ° Simulations
7. 7. 7 Text Book ° Primary Text: “Digital Design” By M. Morris Mano and Michael D. Ciletti ° Complementary Material “Logic and Computer Design Fundamentals” By M. Morris Mano & Charles R Kime.
8. 8. 8 Digital Logic Design Lecture 1 Number Systems
9. 9. 9 Number Systems ° Decimal is the number system that we use ° Binary is a number system that computers use ° Octal is a number system that represents groups of binary numbers (binary shorthand). It is used in digital displays, and in modern times in conjunction with file permissions under Unix systems. ° Hexadecimal (Hex) is a number system that represents groups of binary numbers (binary shorthand). Hex is primarily used in computing as the most common form of expressing a human- readable string representation of a byte (group of 8 bits).
10. 10. 10 Overvie w ° The design of computers • It all starts with numbers • Building circuits • Building computing machines ° Digital systems ° Understanding decimal numbers ° Binary and octal numbers • The basis of computers! ° Conversion between different number systems
11. 11. 11 Analog vs. Digital Consider a faucet Digital Water can be flowing or NOT flowing from the faucet Two States • On • Off Analog How much water is flowing from the faucet? Advantages of Digital Replication • Analog Try replicating the exact flow from a faucet • Digital
12. 12. 12 Advantages of Digital o Error Correction/Detection • Small errors don’t propagate o Miniaturization of Circuits o Programmability • Digital computers are programmable °Two discrete values are used in digital systems. °How are discrete elements represented? • Signals are the physical quantities used to represent discrete elements of information in a digital system. °Electric signals used: • Voltage • Current
13. 13. 13 Advantages of Digital/Representation of Binary Values Volts - 1 .0 0 .0 1 .0 2 .0 3 .0 4 .0 5 .0 6 .0 H ig h L o w °Why are there voltage ranges instead of exact voltages? • Variations in circuit behavior & noise oTwo possible values • 1, 0 • On, Off • True, False • High, Low • Heads, Tails • Black, White
14. 14. 14
15. 15. 15 Digital Computer Systems ° Digital systems consider discrete amounts of data. ° Examples • 26 letters in the alphabet • 10 decimal digits ° Larger quantities can be built from discrete values: • Words made of letters • Numbers made of decimal digits (e.g. 239875.32) ° Computers operate on binary values (0 and 1) ° Easy to represent binary values electrically • Voltages and currents. • Can be implemented using circuits • Create the building blocks of modern computers
16. 16. 16 Understanding Decimal Numbers ° Decimal numbers are made of decimal digits: (0,1,2,3,4,5,6,7,8,9) ° But how many items does a decimal number represent? • 8653 = 8x103 + 6x102 + 5x101 + 3x100 ° What about fractions? • 97654.35 = 9x104 + 7x103 + 6x102 + 5x101 + 4x100 + 3x10-1 + 5x10-2 • In formal notation -> (97654.35)10 ° Why do we use 10 digits, anyway?
17. 17. 17 Understanding Octal Numbers ° Octal numbers are made of octal digits: (0,1,2,3,4,5,6,7) ° How many items does an octal number represent? • (4536)8 = 4x83 + 5x82 + 3x81 + 6x80 = (1362)10 ° What about fractions? • (465.27)8 = 4x82 + 6x81 + 5x80 + 2x8-1 + 7x8-2 ° Octal numbers don’t use digits 8 or 9 ° Who would use octal number, anyway?
18. 18. 18 Understanding Binary Numbers ° Binary numbers are made of binary digits (bits): • 0 and 1 ° How many items does an binary number represent? • (1011)2 = 1x23 + 0x22 + 1x21 + 1x20 = (11)10 ° What about fractions? • (110.10)2 = 1x22 + 1x21 + 0x20 + 1x2-1 + 0x2-2 ° Groups of eight bits are called a byte • (11001001) 2 ° Groups of four bits are called a nibble. • (1101) 2
19. 19. 19 Why Use Binary Numbers? ° Easy to represent 0 and 1 using electrical values. ° Possible to tolerate noise. ° Easy to transmit data ° Easy to build binary circuits. AND Gate 1 0 0
20. 20. 20 BinaryBinary Base 2 = Base 10 000 = 0 001 = 1 010 = 2 011 = 3 100 = 4 101 = 5 110 = 6 111 = 7 In Binary, there are only 0’s and 1’s. These numbers are called “Base-2” ( Example: 0102) BinarytoDecimal We count in “Base-10” (0 to 9) ° Binary number has base 2 ° Each digit is one of two numbers: 0 and 1 ° Each digit is called a bit ° Eight binary bits make a byte ° All 256 possible values of a byte can be represented using 2 digits in hexadecimal notation.
21. 21. 21 Binary as a VoltageBinary as a Voltage ° Voltages are used to represent logic values: ° A voltage present (called Vcc or Vdd) = 1 ° Zero Volts or ground (called gnd or Vss) = 0 A simple switch can provide a logic high or a logic low.
22. 22. 22 A Simple SwitchA Simple Switch ° Here is a simple switch used to provide a logic value: Vcc Gnd, or 0 Vcc Vcc, or 1 There are other ways to connect a switch.
23. 23. 23 Binary digits Bit: single binary digit Byte: 8 binary digits 100101112 Bit Byte Radix
24. 24. 24 Conversion Between Number Bases Decimal(base 10) Octal(base 8) Binary(base 2) Hexadecimal (base16) ° Learn to convert between bases. ° Already demonstrated how to convert from binary to decimal. ° Hexadecimal described in next lecture.
25. 25. 25 Number Systems System Base Symbols Used by humans? Used in computers? Decimal 10 0, 1, … 9 Yes No Binary 2 0, 1 No Yes Octal 8 0, 1, … 7 No No Hexa- decimal 16 0, 1, … 9, A, B, … F No No
26. 26. 26 Con ver sio n Am ong Bas es The possibilities: Hexadecimal Decimal Octal Binary
27. 27. 27 Convert an Integer from Decimal to Another Base 1. Divide decimal number by the base (e.g. 2) 2. The remainder is the lowest-order digit 3. Repeat first two steps until no divisor remains. For each digit position: Example for (13)10: Integer Quotient 13/2 = 6 + ½ a0 = 1 6/2 = 3 + 0 a1 = 0 3/2 = 1 + ½ a2 = 1 1/2 = 0 + ½ a3 = 1 Remainder Coefficient Answer (13)10 = (a3 a2 a1 a0)2 = (1101)2
28. 28. 28 Convert an Fraction from Decimal to Another Base 1. Multiply decimal number by the base (e.g. 2) 2. The integer is the highest-order digit 3. Repeat first two steps until fraction becomes zero. For each digit position: Example for (0.625)10: Integer 0.625 x 2 = 1 + 0.25 a-1 = 1 0.250 x 2 = 0 + 0.50 a-2 = 0 0.500 x 2 = 1 + 0 a-3 = 1 Fraction Coefficient Answer (0.625)10 = (0.a-1 a-2 a-3 )2 = (0.101)2
29. 29. 29 The Growth of Binary Numbersn 2n 0 20 =1 1 21 =2 2 22 =4 3 23 =8 4 24 =16 5 25 =32 6 26 =64 7 27 =128 n 2n 8 28 =256 9 29 =512 10 210 =1024 11 211 =2048 12 212 =4096 20 220 =1M 30 230 =1G 40 240 =1T Mega Giga Tera
30. 30. 30 Binary Addition ° Binary addition is very simple. ° This is best shown in an example of adding two binary numbers… 1 1 1 1 0 1 + 1 0 1 1 1 --------------------- 0 1 0 1 1 1111 1 1 00 carries
31. 31. 31 Binary Subtraction ° We can also perform subtraction (with borrows in place of carries). ° Let’s subtract (10111)2 from (1001101)2… 1 10 0 10 10 0 0 10 1 0 0 1 1 0 1 - 1 0 1 1 1 ------------------------ 1 1 0 1 1 0 borrows
32. 32. 32 Binary Multiplication ° Binary multiplication is much the same as decimal multiplication, except that the multiplication operations are much simpler… 1 0 1 1 1 X 1 0 1 0 ----------------------- 0 0 0 0 0 1 0 1 1 1 0 0 0 0 0 1 0 1 1 1 ----------------------- 1 1 1 0 0 1 1 0
33. 33. 33 Convert an Integer from Decimal to Octal 1. Divide decimal number by the base (8) 2. The remainder is the lowest-order digit 3. Repeat first two steps until no divisor remains. For each digit position: Example for (175)10: Integer Quotient 175/8 = 21 + 7/8 a0 = 7 21/8 = 2 + 5/8 a1 = 5 2/8 = 0 + 2/8 a2 = 2 Remainder Coefficient Answer (175)10 = (a2 a1 a0)2 = (257)8
34. 34. 34 Convert an Fraction from Decimal to Octal 1. Multiply decimal number by the base (e.g. 8) 2. The integer is the highest-order digit 3. Repeat first two steps until fraction becomes zero. For each digit position: Example for (0.3125)10: Integer 0.3125 x 8 = 2 + 5 a-1 = 2 0.5000 x 8 = 4 + 0 a-2 = 4 Fraction Coefficient Answer (0.3125)10 = (0.24)8
35. 35. 35 Summary ° Binary numbers are made of binary digits (bits) ° Binary and octal number systems ° Conversion between number systems ° Addition, subtraction, and multiplication in binary

### Hinweis der Redaktion

• Give qualifications of instructors:
DAP
teaching computer architecture at Berkeley since 1977
Co-athor of textbook used in class
Best known for being one of pioneers of RISC
currently author of article on future of microprocessors in SciAm Sept 1995
RY
took 152 as student, TAed 152,instructor in 152
joined NextGen to design fact 80x86 microprocessors
one of architects of UltraSPARC fastest SPARC mper shipping this Fall
• Give qualifications of instructors:
DAP
teaching computer architecture at Berkeley since 1977
Co-athor of textbook used in class
Best known for being one of pioneers of RISC
currently author of article on future of microprocessors in SciAm Sept 1995
RY
took 152 as student, TAed 152,instructor in 152
joined NextGen to design fact 80x86 microprocessors
one of architects of UltraSPARC fastest SPARC mper shipping this Fall
• credential:
bring a computer
die photo
wafer
:
This can be an hidden slide. I just want to use this to do my own planning.
I have rearranged Culler’s lecture slides slightly and add more slides. This covers everything he covers in his first lecture (and more) but may
We will save the fun part, “ Levels of Organization,” at the end (so student can stay awake): I will show the internal stricture of the SS10/20.
Notes to Patterson: You may want to edit the slides in your section or add extra slides to taylor your needs.
• credential:
bring a computer
die photo
wafer
:
This can be an hidden slide. I just want to use this to do my own planning.
I have rearranged Culler’s lecture slides slightly and add more slides. This covers everything he covers in his first lecture (and more) but may
We will save the fun part, “ Levels of Organization,” at the end (so student can stay awake): I will show the internal stricture of the SS10/20.
Notes to Patterson: You may want to edit the slides in your section or add extra slides to taylor your needs.
• credential:
bring a computer
die photo
wafer
:
This can be an hidden slide. I just want to use this to do my own planning.
I have rearranged Culler’s lecture slides slightly and add more slides. This covers everything he covers in his first lecture (and more) but may
We will save the fun part, “ Levels of Organization,” at the end (so student can stay awake): I will show the internal stricture of the SS10/20.
Notes to Patterson: You may want to edit the slides in your section or add extra slides to taylor your needs.
• credential:
bring a computer
die photo
wafer
:
This can be an hidden slide. I just want to use this to do my own planning.
I have rearranged Culler’s lecture slides slightly and add more slides. This covers everything he covers in his first lecture (and more) but may
We will save the fun part, “ Levels of Organization,” at the end (so student can stay awake): I will show the internal stricture of the SS10/20.
Notes to Patterson: You may want to edit the slides in your section or add extra slides to taylor your needs.
• credential:
bring a computer
die photo
wafer
:
This can be an hidden slide. I just want to use this to do my own planning.
I have rearranged Culler’s lecture slides slightly and add more slides. This covers everything he covers in his first lecture (and more) but may
We will save the fun part, “ Levels of Organization,” at the end (so student can stay awake): I will show the internal stricture of the SS10/20.
Notes to Patterson: You may want to edit the slides in your section or add extra slides to taylor your needs.
• Design state of art organization in 1990
• Design state of art organization in 1990
• Design state of art organization in 1990
• credential:
bring a computer
die photo
wafer
:
This can be an hidden slide. I just want to use this to do my own planning.
I have rearranged Culler’s lecture slides slightly and add more slides. This covers everything he covers in his first lecture (and more) but may
We will save the fun part, “ Levels of Organization,” at the end (so student can stay awake): I will show the internal stricture of the SS10/20.
Notes to Patterson: You may want to edit the slides in your section or add extra slides to taylor your needs.