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Program Approach: Step 1: Import the required libraries Numpy, Pandas, and statistics. Step 2: Load…

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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1. Consider the following description for a NAND2 gate. entity nand 2 is port (il, i2 : in std logic; o : out std logic) ; end nand 2; architecture dataflow of nand 2 is begin o <= il nand i2; end dataflow; The entity description is given below for a four input sum-of-products gate (ab + cd). Give the structural description of the architecture using only the nand 2 gates. Draw a schematic showing your logic gate design and label any signals used. entity and or is port (a, b, c, d: in std_logic; Y: out std_logic); end;
Consider the Moore machine shown in below figure.Construct the transition table. What is the output for input 01010? (0/0) 1/0 Output = 0 9 0/0 1/0 1/0 1/1 9:J0/0) Output = 0 Output 0/1 Output = 1
QUESTION 12 Flip-flops are normally used for all of the following applications, except logic gates counting frequency division data storage QUESTION 13 Which of the following best describes the action of pulse-triggered flip-flops? The clock and R-S inputs must be pulse shaped. The data is entered on the leading edge of the clock, and transferred out on the trailing edge of the clock. A pulse on the clock transfers data from input to output. The synchronous inputs must be pulsed.
Q25/A stable multivibrator operating at 100 Hz has a discharge time 2ms. The duty cycle of the circuit: a) 10% Ob) 20% Oc) 80% d) 50%
Define the problem's circumstances would be a logical first step in PC troubleshooting.
Q) Why do NAND & NOR call Universal Gates? What is the advantage of using them? A) Implement F = A B using NAND gates only. Draw the Logical diagram then complete the Truth Table. B) Implement F = A + B using NAND gates only. Draw the Logical Diagram then complete the Truth Table.
A 4 bit (Q3 Q₂ Q₁ Qo) binary down ripple counter is designed. The clock cycles are negative edge triggered and J-K-Flip-Flops (FF's) are used during the design process. Both the inputs J and K of FF's are connected to logic 1. What will be the input to clocks of next MSB FF's?
Assume we are writing a testbench for a sequential circuit that has three control inputs (cA, cB, cC) and a periodic clock (clk). If we define CLK_PERIOD as a localparameter with a value of 50 (nsec), write the testbench segment that would ensure all possible combinations of the control inputs were tested on a clock rising edge. This is can be done more elegantly if you define each time step in terms of the constant CLK_PERIOD. Your answer should include the statements that define clk, cA, cB, and cC over time. Hint: think of how you would show all combinations of three variables on a truth table and replicate that over time, where each combination is held over a timespan with a clock triggering edge.
A conveyor system is a mechanical handling equipment that moves materials from one location to another as shown in Figure Q5. Suppose that the rotor of the conveyor system in Figure Q5 is connected to a DC motor where the L293D motor driver is used to control the speed of the motors by using the pulse-width modulation (PWM) signal. The PWM signals with different duty cycles is generated by the LPC1768 microcontroller. Four speed levels are determined by three switches as shown in Table Q5. (a) Draw a flowchart to devise a program for the conveyor system based on the specifications above.
Ans (3)
QUESTION 1 How is a CMOS NAND gate implemented? ⒸA pull-up network of 1 PMOS transistor and a pull-down network of 1 NMOS transistor. ⒸA pull-up network of 2 PMOS transistors in parallel and a pull-down network of 2 NMOS transistors in series followed by a pull-up network of 1 PMOS transistor and a pull-down network of 1 NMOS transistor. ⒸA pull-up network of 1 NMOS transistor and a pull-down network of 1 PMOS transistor. ● A pull-up network of 2 NMOS transistors in series and a pull-down network of 2 PMOS transistors in parallel. A pull-up network of 2 PMOS transistors in series and a pull-down network of 2 NMOS transistors in parallel ⒸA pull-up network of 2 PMOS transistors in series and a pull-down network of 2 NMOS transistors in parallel followed by a pull-up network of 1 PMOS transistor and a pull-down network of 1 NMOS transistor. ⒸA pull-up network of 2 PMOS transistors in parallel and a pull-down network of 2 NMOS transistors in series.