Advanced Information Storage 02
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1 dvanced Information Storage 02 tsufumi Hirohata Department of Electronics 16:00 10/October/2013 Thursday (V 120) Quick Review over the Last Lecture Von Neumann s model : Memory access : Bit / byte : 1 bit : 2 = combinations digit in binary number 1 byte (B) = bit *
2 02 Binary Data Binary numbers Conversion dvantages Logical conjunctions dders Subtractors Bit and Byte Bit : Binary digit is a basic data size in information storage. 1 bit : 2 = combinations ; digit in binary number 2 2 = 3 2 = 4 2 = : : : : Byte : data unit to represent one letter in Latin character set. 1 byte (B) = bit 1 kb = 1 B 1 MB = 1 kb : :
3 Binary Numbers The modern binary number system was discovered by Gottfried Leibniz in 1679 : * Decimal notation Binary notation : : * Conversion to Binary Numbers 1 For example, 1192 : 2 ) = ) = ) = ) = ) = ) = ) = ) = ) = ) = ) = ) =
4 Conversion to Binary Numbers 2 For example, 0.1 : = 0.2 < = 0.4 < = 0.8 < = 1.6 > = 1.2 > = 0.4 < : : = Why re Binary Numbers Used? In order to represent a number of 1192 by ON / OFF lamps : Binary number : ( digits = lamps) Decimal number : (4 digits = lamps) Similarly, Ternary number : (7 digits = lamps) 1192 = = Quaternary number : (7 digits = lamps) 1192 = = Binary numbers use the!
5 Mathematical Explanation In a base-n positional notation, a number x can be described as : x = n y (y: number of digits for a very simple case) In order to minimise the number of devices, i.e., n y, ln(x) = Here, ln(x) can be a constant C, C = y = By substituting this relationship into n y, n y = To find the minimum of n / ln(n), [n / ln(n)] = Here, [n / ln(n)] = 0 requires = 0 Therefore, n = provides the minimum number of devices. Logical Conjunctions 1 ND : Venn diagram of B B B True (T) (1) T (1) False (F) (0) T (1) T (1) F (0) F (0) F (0) Logic circuit B
6 Logical Conjunctions 2 OR : Venn diagram of B B B B T (1) T (1) F (0) T (1) T (1) F (0) F (0) F (0) Logic circuit Logical Conjunctions 3 NOT : Venn diagram of (Ā) Ā T (1) F (0) Ā Logic circuit
7 dditional Logical Conjunctions 1 NND = (NOT ) OR (NOT B) = NOT ( ND B) : Venn diagram of B B B T (1) T (1) F (0) T (1) T (1) F (0) F (0) F (0) Logic circuit B dditional Logical Conjunctions 2 NOR = NOT ( OR B) : Venn diagram of B B B T (1) T (1) F (0) T (1) T (1) F (0) F (0) F (0) Logic circuit B NOR can represent all the logical conjunctions : NOT = ND B = = a OR B = = a
8 dditional Logical Conjunctions 3 XOR = Exclusive OR : Venn diagram of B B B T (1) T (1) F (0) T (1) T (1) F (0) F (0) F (0) Logic circuit B Simple adder for two single binary digits : XOR for the sum (S) Half dder ND for the carry (C), which represents the overflow for the next digit B S C
9 Full dder dder for two single binary digits as well as values carried in (C in) : 2 half adders for sum (S) dditional OR for the carry (C out), which represents the overflow for the next digit B C in S C out Half Subtractor Simple subtractor for two single binary digits, minuend () and subtrahend (B) : XOR for the difference (D) B D Bor NOT and ND for the borrow (Bor), which is the borrow from the next digit B D Bor
10 Full Subtractor Subtractor for two single binary digits as well as borrowed values carried in (Bor in) : 2 half subtractor for difference (D) dditional OR for the borrow (Bor out), which is the borrow from the next digit B Bor in D Bor out Information Processing For data processing, two distinct voltages are used to represent 1 and 0 : Low level (1) and high level (2) voltages Voltages used : Devices Low voltage High voltage Emitter-coupled logic (ECL) Transistor-transistor logic (TTL) Complementary metal-oxidesemiconductor (CMOS) ~ V 0 ~ 0.75 V 0 ~ 0.8 V 2 ~ 4.75 (or 5.25) V 0 ~ V DD / 2 V DD / 2 ~ V DD (V DD = 1.2, 1.8, 2.4, 3.3 V etc.)
11 Emitter-Coupled Logic In 1956, Hannon S. Yourke invented an ECL at IBM : * High-speed integrated circuit, differential amplifier, with bipolar transistors Transistor-Transistor Logic In 1961, James L. Buie invented a TTL at TRW : * Integrated circuit, logic gate and amplifying functions with bipolar transistors
12 Complementary Metal-Oxide-Semiconductor In 1963, Frank Wanlass patented CMOS : * Integrated circuit with low power consumption using complementary MOSFET
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