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# quiz - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of...

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1 of 10 MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Electrical Engineering and Computer Sciences Introductory Digital Systems Lab (6.111) Quiz - Spring 2004 Prof. Anantha Chandrakasan Student Name: Problem 1 (16 Points): _____________________ Problem 2 (24 Points): _____________________ Problem 3 (24 Points): _____________________ Problem 4 (16 Points): _____________________ Problem 5 (20 Points): _____________________ Total (100 Points): _____________________

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2 of 10 Problem 1: Sequential Building Block Characterization: Consider the following implementation of a register. Assume that an inverter has a delay of 1 and that the switch is ideal. The switch is closed when the control input is high. (a) What type of register is shown above (circle one)? (4 points) positive edge-triggered negative edge-triggered (b) What is the setup time ( t su ), hold time ( t hold ), and propagation ( t cq ) delay. Assume that CLK and CLK are ideal (i.e., the delay to derive CLK from CLK is zero). (12 points) D Master (inverting) Latch Slave (inverting) Latch CLK CLK CLK CLK Q
3 of 10 Problem 2: Clock Gating Circuit Assume for the entire problem that the counter reset is synchronous . (a) Consider the one second clock from lab2. The 1Hz enable is derived from the circuit below (the clock is the 1.8432Mhz clock). Assume that a global reset signal puts the count to 0 (the circuit is not shown here). Suppose the 1Hz enable is used to clock other circuits that need to be updated once per second (e.g., the register shown below). Identify the main problem with this circuit. (4 points) (b) The following is a simple modification that is proposed to solve the problem of part (a). The counter is negative edge-triggered and the AND gate is introduced before the register clock. Assume that the AND gate is ideal (i.e., has zero delay). Does this circuit fix the problem of part (a)? If so, under what conditions does this circuit function properly? If not, explain why. (6 points) Q Counter

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quiz - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of...

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