How many memory accesses are required for the processing of an LEA instruction? Answer:
How many memory accesses are required for the processing of an LEA instruction? Answer:
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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Question
![How many memory accesses are required for the processing of an LEA instruction?
Answer:
For the instruction: ADD R3, R2, R1
or in binary: 0001 011 010 000 001
which of the ALU inputs (A or B) will receive the value of R1?
Answer:
Give an example instruction (just one example) that causes the SR2MUX multiplexer in figure 5.18 to choose its leftmost input (the one coming from [4:0] SEXT). (Give an
opcode as your answer such as LD, LDI, etc.)
Answer:
In which clock cycle of the fetch phase is the PC updated? (Answer: first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth)
Answer:
Which of the following labels in the figure 5.18 are labels of multiplexers?
Select one or more:
O ZEXT
O PCMUX
O PC
O LOGIC
O SR2MUX
What is the function of the tristate device labeled GatePC?
Şelect one:
O Allows the value of the PC onto the global bus
O Allows the value of the global bus to be stored into the PC
O Allows the value of the PC onto the global bus and allows the value of the global bus to be stored in the PC
O Allows the value selected by the PCMUX to be stored in the PC
How many memory accesses are required for the processing of an LDI instruction?
Answer:
In figure 5.18, what is the function of the component SEXT[10:0]?
Select one:
O It sign extends an 11 bit immediate value coming from the IR
O It calculates the value of the select lines going into the ADDR2MUX multiplexer
O It is storage for the 11 bit immediate value coming from the IR
O I t is choosing the leftmost input for ADD2MUX
O None of the other answers are correct.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F56948d1f-f3cf-4f40-ab0a-6067bba5bbc4%2F0def4a3c-a7d5-469c-a259-c6fe5feacbd2%2F40sa3c_processed.jpeg&w=3840&q=75)
Transcribed Image Text:How many memory accesses are required for the processing of an LEA instruction?
Answer:
For the instruction: ADD R3, R2, R1
or in binary: 0001 011 010 000 001
which of the ALU inputs (A or B) will receive the value of R1?
Answer:
Give an example instruction (just one example) that causes the SR2MUX multiplexer in figure 5.18 to choose its leftmost input (the one coming from [4:0] SEXT). (Give an
opcode as your answer such as LD, LDI, etc.)
Answer:
In which clock cycle of the fetch phase is the PC updated? (Answer: first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth)
Answer:
Which of the following labels in the figure 5.18 are labels of multiplexers?
Select one or more:
O ZEXT
O PCMUX
O PC
O LOGIC
O SR2MUX
What is the function of the tristate device labeled GatePC?
Şelect one:
O Allows the value of the PC onto the global bus
O Allows the value of the global bus to be stored into the PC
O Allows the value of the PC onto the global bus and allows the value of the global bus to be stored in the PC
O Allows the value selected by the PCMUX to be stored in the PC
How many memory accesses are required for the processing of an LDI instruction?
Answer:
In figure 5.18, what is the function of the component SEXT[10:0]?
Select one:
O It sign extends an 11 bit immediate value coming from the IR
O It calculates the value of the select lines going into the ADDR2MUX multiplexer
O It is storage for the 11 bit immediate value coming from the IR
O I t is choosing the leftmost input for ADD2MUX
O None of the other answers are correct.
Transcribed Image Text:How many clock cycles does the LC-3 microarchitecture take to perform the fetch stage?
Answer:
Consider the following LC-3 instruction
0001 0010 0110 1001
Referring to figure 5.18, what value will be produced by the combinational circuit that performs sign extension of the immediate value?
Select one:
O 0 1001
O 0000 0000 0000 1001
O 0000 1001
O 0000 1001
O 1000 0000 0000 1001
Consider the following LC-3 instruction
0001 0010 0111 0001
Referring to figure 5.18, what value will be produced by the combinational circuit that performs sign extension of the immediate value?
Select one:
O 1 0001
O 1111 1111 1111 0001
O 1111 0001
O 1000 0001
O 1000 0000 0000 0001
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