ee201_midterm1_Sp2006

ee201_midterm1_Sp2006 - ee201_midterm1_Sp2006.fm Spring...

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ee201_midterm1_Sp2006.fm 4/1/06 EE201L Midterm #1 - Spring 2006 1 / 8 C Copyright 2006 Gandhi Puvvada Spring 2006 EE201L Instructor: Gandhi Puvvada Midterm Exam (15%) Date: March 31, 2006, Friday Open-Book Open-Notes Exam Time: 4:05 - 5:55PM in SGM124 Name: Total points: Perfect score: 1 ( points) min. Low-active signals: 1.1 An unsigned 4-bit comparator produces the following three low-active output signals: However, we needed the following three low-active output signals: Show how to produce these from the outputs of the comparator. Please try to use as few gates as possible. 1.2 Given two unsigned 4-bit comparators with the following low-active output signals, arrive at the needed additional glue logic to compare two 8-bit numbers, X and Y and produce a low-active signal "X greater or equal to Y". . . AB = < > XY < > A<B A>B A=B 4-bit Magni tude Comparator A 0 1 2 3 B A < B in A > B A = B out From your EE101 notes for reference A 0 A 1 A 2 A 3 B 0 B 1 B 2 B 3 A 0 A 1 A 2 A 3 B 0 B 1 B 2 B 3 High-active signals X7 X6 X5 X4 X3 X2 X1 X0 Y7 Y6 Y5 Y4 Y3 Y2 Y0 Y1 X U (X upper) L (X lower) Y (Y upper) X U > Y U X U = Y U X L > Y L X L = Y L Low-active
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ee201_midterm1_Sp2006.fm 4/1/06 EE201L Midterm #1 - Spring 2006 2 / 8 C Copyright 2006 Gandhi Puvvada 2 ( points) min. 2.1 A 330 ohms is a common choice for a current-limiting resistance connected in series with an LED as shown. __________________________ ( Reducing / Increasing ) the value of this resistance can make the LED glow brighter but could strain the __________________ ( I IH , I IL , I OH , I OL ) capability of the driving gate, driving the LED in sinking mode. 2.2 Given below are K-Maps for a function F and its complement ( F ). Also given are the SOP expressions for F and F . Please fill-in the POS expressions for each of them. 2.3 Logic for driving LED connected in sinking mode: We need to light-up an LED (make it glow) whenever the above function F is a logic "1". Complete the following two implementations by labeling the inputs. 2.4 |I OH | ___________________________________________ ( should be greater than / should be less than / has no relation to ) |I OL |. 2.5 VIL is the _______________ ( minimum/maximum ) acceptable voltage at the ____________ ( output/input ) of a gate for the gate to recognize VIL as a ________________________ ( high enough/low enough ) _______________________ ( input/output ) signal. 2.6 The LH and HL in tpLH and tpHL refer to _______________________________ ( input / output / both input and output / input to output / output to input ) transitions ______________________________ _____________________ ( for all gates / for inverting gates only / for non-inverting gates only ). 2.7 A ___________________________________ ( Schmitt-trigger/Shottky/neither Schmitt-trigger nor Shottky ) input gate is used at the ________________________ ( input/output ) of an add-on card or a card connected through a ribbon cable to remove noise in the signal and also to __________________________________ ( slow down/speedup ) the 1-to-0 and 0-to-1 transitions.
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ee201_midterm1_Sp2006 - ee201_midterm1_Sp2006.fm Spring...

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