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1)The following diagram shows a logic circuit using a combinatorial...

1)     The following diagram shows a logic circuit using a combinatorial chip called A, and a sequential chip called B.

 

Which wiring is legal, the wiring around chip A or the wiring around chip B.

Select one:

 a. the wiring around chip A.

 b. the wiring around chip B.

 

2)     Which of the following is being used when loading a constant into a register:

Select one:

 a. direct addressing

 b. immediate addressing

 c. indirect addressing.

 d. All answers are wrong.


3)     The Screen and Keyboard chips have the same interface as RAM chips.

Select one:

 True

 False

4)     Which of the following is defined as a combinational device?

Select one:

 a. Register

 b. RAM

 c. ALU

 d. Screen


5)     It is possible to force the Hardware Simulator to load a built-in version of chip Xxx. This can be done by:

Select one:

 a. making sure the Xxx.hdl file is not loctaed in the current directory.

 b. leaving the chip body in the Xxx.hdl file empty.

 c. stating in the chip header that this is a built-in chip.

 d. once the chip was implemented by the user, this is not possible.


6)     In the HDL implementation of the Bit chip, the output from the DFF is connected to the input of the Mux. This is done

Select one:

 a. to convert the Mux into a sequential chip.

 b. to ensure that the Bit value is retained after each clock cycle if load is off.

 c. to ensure that the new input bit is stored on every clock cycle.

 d. to ensure that the Bit value is retained after each clock cycle if load is on.


7)     If we want the ALU to compute the function y-1, what should be the value of the zx (zeroed) and nx (negated)?

Select one:

 a. zx = 1, nx=1

 b. zx = 0, nx=1

 c. zx = 1, nx=0

 d. zx = 0, nx=0


8)     Which of the followings is not a sequential chip:

Select one:

 a. Counter

 b. DFF

 c. Bit

 d. Adder


9)     Which of the followings is an unary Boolean function:

Select one:

 a. Not

 b. And

 c. Or

 d. Nand

 

10)  If you want to covert x to its negative value in 2's complement you should:

Select one:

 a. invert (not) every bit in the number x.

 b. invert the most significant bit of x.

 c. invert every bit of x and add 1.

 d. invert every bit of x and subtract 1.


11)  Which of the following statements about the ALU discussed and used in this course is wrong?

Select one:

 a. The ALU is part of the computer's CPU.

 b. The ALU is eventually based on a set of Nand gates.

 c. The ALU can compute a fixed set of functions on its two 16-bit inputs.

 d. The ALU implementation is based on sequential logic.

 e. The efficiency of the ALU is related to the efficiency of the Adder chip.


12)  What is the binary pattern that represents 7ten (in a 16-bit binary system)?

Answer: 


13)  A demultiplexor with 5 outputs must have a minimum of ____ select bits?

Answer: 


14)  Programs written in the Hack language (.asm) can be run in the following way:

Select one:

 a. translate the program using the supplied assembler and then run the binary code (.hack) using the CPU simulator.

 b. run the assembly code (.asm) using the CPU simulator.

 c. translate the program using the supplied assembler and then run the binary code (.hack) using the Hardware Simulator directly.

 d. Answers (a)-(b)-(c) are correct.

 e. Answers (a)-(b) are correct

 

15)  Each memory address in the Hack computer references

Select one:

 a. a single byte.

 b. a single word.

 c. multiple words.

 d. the D-register.


16)  A decoder described as a 1-of-4 decoder has how many total outputs?

Answer: 


17)  Supply the hexadecimal result of 6 + 7 (both base 10) if stored in a 16 bit register.

Answer: 


18)  In a 4-way 16-bit Multiplexor the selector is:

Select one:

 a. 2-bit wide.

 b. 16-bit wide.

 c. 4-bit wide.

 d. 1-bit wide.

 

19)  What is the decimal value of this 16-bit 2's complement number: 1111111111111001two

Answer:              

Answer & Explanation
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