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(a) Why does synchronisation failure occur?

(a) Why does synchronisation failure occur?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Q4 (a) Why does synchronisation failure occur? (b) Suppose, you are building an embedded microprocessor system with a 10MHZ clock and use the circuit of figure Q4 (b) to synchronise an asynchro- nous input which changes 100,000 times per second. Assume that a typical flip-flop has been used for which the constants To and t are 0.4s and 1.5ns respectively. If the setup time of the flip-flop is 20ns, calculate the mean time between synchroniser failures. Page S of 7 ASYNCIN Syncvonous System CLOCK K Figure Q4 (b) (c) The circuit in Figure Q4 (c) consists of edge triggered flipflops. The second flipflop receives the clock signal through a long slow path which results in delay. Answer the following questions: Q2 IN D 아 01 D CLOCKD Dax CLK CLOCK A long slow path Figure Q4 (c) i) Define elock skew. ii) Explain with a timing diagram, what problem this circuit might face? What condition it must satisfy to ensure that the intended circuit output is not affected? ii) (d) For the following LFSR circuit in the Figure Q4 (d), let the initial entries of stages R. be Si, for 0sisn. Compute the first 12 bit output for the following cases of initial entries: S: Si So Case 1 Case 2 Page 6 of 7 R3 R2 R1 RO Figure Q4 (d)
Transcribed Image Text:Q4 (a) Why does synchronisation failure occur? (b) Suppose, you are building an embedded microprocessor system with a 10MHZ clock and use the circuit of figure Q4 (b) to synchronise an asynchro- nous input which changes 100,000 times per second. Assume that a typical flip-flop has been used for which the constants To and t are 0.4s and 1.5ns respectively. If the setup time of the flip-flop is 20ns, calculate the mean time between synchroniser failures. Page S of 7 ASYNCIN Syncvonous System CLOCK K Figure Q4 (b) (c) The circuit in Figure Q4 (c) consists of edge triggered flipflops. The second flipflop receives the clock signal through a long slow path which results in delay. Answer the following questions: Q2 IN D 아 01 D CLOCKD Dax CLK CLOCK A long slow path Figure Q4 (c) i) Define elock skew. ii) Explain with a timing diagram, what problem this circuit might face? What condition it must satisfy to ensure that the intended circuit output is not affected? ii) (d) For the following LFSR circuit in the Figure Q4 (d), let the initial entries of stages R. be Si, for 0sisn. Compute the first 12 bit output for the following cases of initial entries: S: Si So Case 1 Case 2 Page 6 of 7 R3 R2 R1 RO Figure Q4 (d)
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