hw3_soln

hw3_soln - Rice University ELEC 220 Fundamentals of...

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Rice University ELEC 220 – Fundamentals of Computer Engineering Homework #3 1. a. The truth table, including what was given: in<3:0> out<1:0> any 0000 XX 0 0001 00 1 0010 01 1 0011 01 1 0100 10 1 0101 10 1 0110 10 1 0111 10 1 1000 11 1 1001 11 1 1010 11 1 1011 11 1 1100 11 1 1101 11 1 1110 11 1 1111 11 1 b. In this table, there should be two groups circled: the middle two rows, the last two rows. out 1 in<1:0> 00 01 11 10 in<3:2> 00 X 0 0 0 01 1 1 1 1
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11 1 1 1 1 10 1 1 1 1 s out 1 = in 2 + in 3 s In this table, there should be two groups circled: the last two rows, the last two entries in the first and last rows. out 0 in<1:0> 00 01 11 10 in<3:2> 00 X 0 1 1 01 0 0 0 0 11 1 1 1 1 10 1 1 1 1 s out 0 = in 3 + in 2 'in 1 2. a. This consists of some combination logic in front of a S/R latch. Specifically, the logic for setting that latch is S NAND WE , and the logic for resetting that latch is R NAND WE . If WE =0, then both of those result in 1, which means that the internal latch just holds its current values. If WE =1, though that the latch is set when S goes high and reset when R goes high. Thus, this is just a set/reset latch with active-high inputs that
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This note was uploaded on 04/07/2008 for the course ELEC 220 taught by Professor Cavallaro during the Spring '08 term at Rice.

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hw3_soln - Rice University ELEC 220 Fundamentals of...

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