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Unformatted text preview: Name: Student ID: The University of British Columbia
Department of Electrical and Computer Engineering
EECE 201 Project Integrated Program
Module 2, Quiz 3
16 November 2009
Time: 50 minutes Notes books calculators etc are NOT allowed. There are three uestions over ﬁve 8. es includin the formula sheet}. Good luck! 1. [10 points] Consider the circuit below: 01k Given the “Clk” and “In” waveforms shown below, draw the waveforms at points 1, 2, 3 and 4 on
the same graph. Assume that at the very beginning, point 1 is at logic value “0” and point 3 is at
logic value “1”. Also assume that the latch and the flipﬂop have no delay. Page 1 of 5 Name: Student ID: 2. [15 points] a) Complete the truth table for the circuit below. A Control Wham Wire/=0
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i. ML 38—") 4’ ﬂ“ 31 it at ' => 7;. meow if;gj_'.f_"j’jlfi‘jfﬁ;* ’ﬁj..iﬁQj;i,f,,,..i.,..
i? MHzc.5130? Olin)” Q (t) (3% ,ars) ﬂchJ .
R (if) (I 15f“) IWWZM O b) Ass
is 1 ns If the‘ ‘set up time of the flip— ﬂop IS 5 us, what 13 the overall‘ ‘set up ”time of the circuit? C77“: Wci£% Dam mm/wtjé’WFF,‘5 ﬁrm» A éfijog £@.'Z+2+l=6ns @ Omﬂ 30/571 flimré—jbl :ilmS Page 2 of 5 Name: Student ID: 3. [25 points] Consider the circuit below:
i f 1) 553
7:;ng Wt m4 fad—[we doc/4 edge Assume that each ﬂipﬂop has a small delay (much smaller than the clock period, but not
negligible) and that the points 1, 2 and 3 are all initially at logic value “0”. ' a) Draw the waveforms for points 1, 2 and 3 on the graph below: Page 3 of 5 Name: Student ID: Problem 2 continued. 9 b) What function is this circuit performing? Brieﬂy explain the behaviour of the JK ﬂipﬂops in
2 h this conﬁguration. @
Con/mi [ﬂ (loam/FF? H c) If the delay of each ﬂipﬂop is 10 ns, what is the maximum clock frequency that can be used
without undermining the Circuit’s proper operation? WM Maraam?— ﬁcmwrcﬁr WM 0175 W 3 04/14/4— ?, WW WWW i1; be, W ﬁrs/Le» 79m» FFB E,
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