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Lecture 4

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Basic Binary Arithmetic 2 Single-bit AdditionSingle-bit Subtraction s 0 1 1 0 c 0 0 0 1 xy 0 0 1 1 0 1 0 1 Carry Sum d 0 1 1 0 xy 0 0 1 1 0 1 0 1 Difference What logic function is this?

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3 Binary Multiplication

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4 0 0 11 x 0 x1 00 0 1 Product

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Binary Multiplication 5 Examples: 00111100 x10101100 10110001 x01101101

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6 Unsigned and Signed Binary Numbers

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Unsigned and Signed Numbers 8-bit Binary number. What is the decimal equivalent of this binary number? 7 10011010

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Unsigned and Signed Numbers 8 b n1– b 1 b 0 Magnitude MSB (a) Unsigned number b n1– b 1 b 0 Magnitude Sign (b) Signed number b n2– 0 denotes 1 denotes + –MSB

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ECE 301 - Digital Electronics9 Unsigned Binary Numbers

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For an n-bit unsigned binary number, all n bits are used to represent the magnitude of the number. ** Cannot represent negative numbers. ECE 301 - Digital Electronics10

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Unsigned Binary Numbers For an n-bit binary number 0 <= D <= 2 n – 1 where D = decimal equivalent value For an 8-bit binary number:0 <= D <= 2 8 – 1 2 8 = 256 For a 16-bit binary number:0 <= D <= 2 16 – 1 2 16 = 65536 11

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ECE 301 - Digital Electronics12 Signed Binary Numbers

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For an n-bit signed binary number, n-1 bits are used to represent the magnitude of the number; the leftmost bit (MSB) is, generally, used to indicate the sign of the number. 0 = positive number 1 = negative number 13

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Signed Binary Numbers Three representations for signed binary numbers: 1. Sign-and-Magnitude 2. One's Complement 3. Two's Complement ECE 301 - Digital Electronics14

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Signed Binary Numbers Sign-and-Magnitude Representation ECE 301 - Digital Electronics15

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Sign-and-Magnitude For an n-bit signed binary number, The MSB (leftmost bit) is the sign bit. The remaining n-1 bits represent the magnitude. - (2 n-1 - 1) <= D <= + (2 n-1 – 1) Includes a representation for -0 and +0. The design of arithmetic circuits for sign-and-magnitude binary numbers is difficult. 16

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Sign-and-Magnitude Example: What is the Sign-and-Magnitude binary number representation for the following decimal values, using 8 bits: + 97 - 68 ECE 301 - Digital Electronics17

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Sign-and-Magnitude Example: Can the following decimal numbers be represented using Sign-and- Magnitude representation and 8 bits? - 127 + 128 - 212 + 255 ECE 301 - Digital Electronics18

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Signed Binary Numbers One's Complement Representation ECE 301 - Digital Electronics19

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One's Complement An n-bit positive number (P) is represented in the same way as in the Sign-and-Magnitude representation. The sign bit (MSB) = 0. The remaining n-1 bits represent the magnitude. ECE 301 - Digital Electronics20

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One's Complement An n-bit negative number (N) is represented using the “One's Complement” of the equivalent positive number (P). N' = One's Complement representation for the negative number N. N' = (2 n – 1) – P where P = |N| The sign bit (MSB) = 1 for all negative numbers using the One's Complement representation. 21

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One's Complement Example: Determine the One's Complement representation for the following negative numbers, using 8 bits: - 11 - 107 - 74 ECE 301 - Digital Electronics22

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One's Complement The One's Complement representation of N can also be determined using the bit-wise complement of P. N = n-bit negative number P = |N| N' = One's Complement representation of N. N' = bit-wise complement of P i.e. complement P, bit-by-bit. ECE 301 - Digital Electronics23

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One's Complement Example: Determine the One's Complement representation (using the bit-wise complement) for the following negative numbers, using 8 bits: - 11 - 107 - 74 ECE 301 - Digital Electronics24

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