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assign7-soln

# assign7-soln - C(x,y,z = ∑(1,5 D(x,y,z = ∑(0,1,5,6,7...

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Electrical and Computer Engineering 19/10/2010 1 EECE256 Assignment 7 1. How many address lines and data lines are needed for the following memory? Address Data a) 16K x 8 14 8 b) 256K x 64 18 64 c) 2G x 16 31 16 d) 20 x 4 5 4 2. Show the Parity bits for a 16-bit and 32-bit number. What is the parity value for the 8-bit binary number 10110101? Place the bits into the appropriate places in the parity+data word. P 1 P 2 D 15 P 4 D 14 D 13 D 12 P 8 D 11 D 10 D 9 D 8 D 7 D 6 D 5 P 16 D 4 D 3 D 2 D 1 D 0 P 1 P 2 D 31 P 4 D 30 D 29 D 28 P 8 D 27 D 26 D 25 D 24 D 23 D 22 D 21 P 16 D 20 D 19 D 18 D 17 D 16 D 15 D 14 D 13 D 12 D 11 D 10 D 9 D 8 D 7 D 6 P 32 D 5 D 4 D 3 D 2 D 1 D 0 P 1 P 2 1 P 4 011 P 8 0101 P 1 = XOR (3,5,7,9,11) = 1 P 2 = XOR (3,6,7,10,11) = 1 P 3 = XOR (5,6,7,12) = 1 P 4 = XOR (9,10,11,12) = 0 111101100101

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Electrical and Computer Engineering 19/10/2010 2 3. Create the truth table for a ROM that implements the Boolean functions: A(x,y,z) = ∑(0,3,6) B(x,y,z) = ∑(1,2,3,6)

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Unformatted text preview: C(x,y,z) = ∑(1,5) D(x,y,z) = ∑(0,1,5,6,7) How big should the ROM be? What is the memory content at addresses 0 and 5? X Y Z A B C D 0 0 0 1 1 0 1 0 0 1 0 1 1 1 0 1 0 0 1 0 0 0 1 1 1 0 0 0 1 0 0 0 0 0 0 1 0 1 0 0 1 1 1 1 0 1 1 0 1 1 1 1 0 0 0 1 Address 0 = 1101 Address 5 = 0011 Electrical and Computer Engineering 19/10/2010 3 4. Derive the PLA programming table for a combinational circuit that squares a 4-bit number, and minimize the number of product terms. What is the width of the output? Electrical and Computer Engineering 19/10/2010 4 It was possible to implement the square function with a PAL, but not very easy. Think of how easy this is to implement using a ROM. Selection of appropriate device types is important!...
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assign7-soln - C(x,y,z = ∑(1,5 D(x,y,z = ∑(0,1,5,6,7...

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