# Memory is implemented as an array of electronic switches

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1 Memory Structure Memory is implemented as an array of electronic switches Each switch can be in one of two states 0 or 1, on or off, true or false, purple or gold, sitting or standing BInary digits (bits) are the fundamental unit of data storage in a computer Accessing each bit individually isn t very useful We want to store data that can take a wider range of values o the value 214 o the letter b o 1

2 Memory Structure By grouping bits together we can store more values 8 bits = 1 byte 16 bits = 2 bytes = 1 halfword 32 bits = 4 bytes = 1 word When we refer to memory locations by address (using the ARM7), we can only do so in units of bytes, halfwords or words the byte at address the halfword at address the word at address bits 1 byte Memory 2

3 Larger Units of Information Storage Larger units of information storage 1 kilobyte (kb) = 2 10 bytes = 1,024 bytes 1 megabyte (MB) = 1,024 KB = 2 20 bytes = 1,048,576 bytes 1 gigabyte (GB) = 1,024 MB = 2 30 bytes =... The following units of groups of bits are also used, usually when expressing data rates: 1 kilobit (kb) = 1,000 bits 1 megabit (Mb) = 1,000 kilobits = 1,000,000 bits IEC prefixes, KiB, MiB, GiB,... 3

4 Numeral Systems We use the decimal (base-10) numeral system most frequently We have symbols (digits) that can represent ten integer values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 We represent integer values larger than 9 with combinations of two or more digits, e.g.: 10, 11, 12,..., 112,..., 247 e.g.: 247 o = (7 x 10 0 ) + (4 x 10 1 ) + (2 x 10 2 ) o 2 is the Most Significant Digit o 7 is the Least Significant Digit Given n decimal digits, how many different integer values can we represent? o [0... (10 n - 1)] o e.g., n = 3 allows us to represent values in the range [ ] 4

5 Binary Numeral System (Base-2) Computer systems store information electronically using bits (binary digits) Each bit can be in one of two states, which we can take to represent the binary (base-2) digits 0 and 1 The binary number system is a natural number system for computing (rather than the decimal system) Using a single bit, we can represent integer values 0 and 1 Using two bits, we can represent 0, 1, 10, 11 o i.e. four different values How many unique values can we represent with, for example, eight bits? o [ ] in binary notation o [0... (2 8-1)] = [ ] in decimal notation o 256 unique values 5

6 Base Subscript Notation There are 102 types of people in the world: those who understand binary and those who don t... The same sequence of symbols can have a different meaning depending on the base being used We can use the subscript notation to make it clear which base we are using = = 1 2 Using binary all the time would become quite tedious The 3D1 exam is worth % of the final mark 6

7 Binary to Decimal Conversion Convert % to its decimal equivalent = (1 x 2 0 ) + (0 x 2 1 ) + (1 x 2 2 ) + (0 x 2 3 ) + (0 x 2 4 ) + (1 x 2 5 ) + = 37 7

8 Decimal to Binary Conversion Convert 37 to its binary equivalent? Quotient Remainder Binary digit 37 / 2 = / 2 = / 2 = / 2 = / 2 = / 2 =

9 Hexadecimal Numeral System (Base 16) Base-16 (hexadecimal) is a more convenient number system for computer scientists: With binary, we needed 2 symbols (0 and 1) With decimal, we needed 10 symbols (0, 1,..., 9) With hexadecimal, we need 16 symbols Use the same ten symbols as the decimal system for the first ten hexadecimal digits Borrow the first six symbols from the alphabet for the last six symbols, 0, 1,, 2,, 3,, 4, 5,, 6,, 7,, 8, 9,, A,, B,, C, D,, E,, F,,, Why is hexadecimal useful? 16 is a power of 2 (2 4 ), so exactly one hex digit can represent the same sixteen possible values as four bits 9

10 Decimal, Binary and Hexadecimal base-10 base-2 base A B C D E F 10

11 Converting Between Binary and Hex One hexadecimal digit represents the same number of values as four binary digits conversion between hex and binary is trivial the hexadecimal notation a convenient one for us or 0x25 A 7 or 0xA7 Hexadecimal is used by convention when referring to memory addresses: e.g. address 0x1000, address 0x4002 0x denotes a hexadecimal value 11

12 Alternative Base Notation Without a fancy word processor, we won t be able to use the subscript notation to represent different bases How would we tell a computer whether we mean 10 or 10? Instead we can prefix values with symbols that provide additional information about the base In ARM assembly language (which we will be using) we use the following notation: 1000 No prefix usually means decimal 0x1000 Hexadecimal, used frequently &1000 2_1000 Binary n_1000 Base n Alternative hexadecimal notation 12

13 Representing Text So far, we have only considered how computers store integer values using binary digits What about representing other information, for example text composed of alphanumeric symbols? T, h, e,, q, u, i, c, k,, b, r, o, w, n,, f, o, x,... We re still restricted to storing binary digits (bits) in memory To store alphanumeric symbols or characters, we can assign each character a value which can be stored in binary form in memory 13

14 ASCII American Standard Code for Information Interchange ASCII is a standard used to encode alphanumeric and other characters associated with text e.g. representing the word hello using ASCII H E L L O \$48 \$45 \$4C \$4C \$4F Each character is stored in a single byte value (8 bits) 1 byte = 8 bits means we can have a possible 256 characters In fact, ASCII only uses 7 bits, giving 128 possible characters Only 96 of the ASCII characters are printable Remaining values are control codes examples?? 14

15 ASCII NUL DLE SPACE P ` p 1 SOH DC1! 1 A Q a q 2 STX DC2 2 B R b r 3 ETX DC3 # 3 C S c s 4 EOT DC4 \$ 4 D T d t 5 ENQ NAK % 5 E U e u 6 ACK SYN & 6 F V f v 7 BEL ETB 7 G W g w 8 BS CAN ( 8 H X h x 9 HT EM ) 9 I Y i y A LF SUB * : J Z j z B VT ESC + ; K [ k { C FF FS, < L \ l D CR GS - = M ] m } E SO RS. > N ^ n ~ F SI US /? O _ o DEL 15

16 ASCII Some things to note about ASCII The value 0 is not the name as the character 0 Similarly, the value 1 is not the same as the character 1,... The characters 0, 1,... are used in text to display values in human readable form Upper and lower case characters have different codes The first printable character is the space symbol, and it has code ASCII is a base-128 number system and each value has a different symbol It is more efficient to store a value in its value form than its text form (i.e. Store the value instead of the ASCII symbols 1 followed by 0.) 16

17 Types of Memory Random Access Memory (RAM) The CPU can both read and modify the contents of memory Volatile (information lost when power is turned off) Non-volatile (information retained when power is turned off) Read Only Memory (ROM) CPU can only read the contents of memory Non-volatile Further classified by ability to change contents o Programmable ROM (PROM): Can only write contents once o Erasable Programmable ROM (EPROM): Can erase contents using ultra-violet light and re-write o Electronically Erasable Programmable ROM (EEPROM): Can erase contents electronically (including Flash Memory ) 17

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