hw07_SLN - ECE 211 HW 7 Solutions p 1 of 7...

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ECE 211 HW 7 Solutions p 1 of 7 //home/vdimitrov/24949/d1dffdebd47920c272369e78552bd3cd884b334f.doc HW Set 7 – SOLUTIONS 1. (a) Using only 7402 gates, design a circuit to realize F = A + B·C + B·D ' with A, C, D active-High, B, F active-Low. (b) How many 7402 chips do you need? (c) Rewrite F as F = A + B ( C + D ' ) and design a 7402-only circuit with the above assertion levels. (d) How many 7402 chips do you need in this circuit? Solution: (a) (b)
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ECE 211 HW 7 Solutions p 2 of 7 (c) (d)
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HW 7 Solutions p 3 of 7 2. T is true iff exactly two of the bits b3 b2 b1 b0 have the value 1. (a) Write a logic expression for T. (In anticipation of the next part, don't use the exclusive-OR connective in your expression.) (b) using only 7420 gates, design a circuit to realize T for the assertion levels T is active-Low b3, b2, b1, b0 are active-High (c) How many 7420 chips do you need in your circuit? Solution: (a) Possible patterns: 1100 1010 1001 0110 0101 0011 T = (b3 b2 b1’ b0’) + (b3 b2’ b1 b0’) + (b3 b2’
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hw07_SLN - ECE 211 HW 7 Solutions p 1 of 7...

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