ARM ARM Certifications EN0-001 Questions & Answers

• Question 131:

  When linking with the standard C library, which library functions MUST be redefined in order to port your code to a new piece of production hardware?

  A. Functions that are not compliant with the ISO C library standard

  B. Functions that are not compliant with the 1985 IEEE 754 standard for binary floating-point arithmetic

  C. Target-dependent functions which use semihosting

  D. Functions called implicitly by the compiler

  Correct Answer: C

• Question 132:

  Which of the following is a REQUIRED feature in the ARMv7 architecture?

  A. The Thumb-2 instruction set

  B. NEON

  C. Integer division instructions

  D. A memory management unit

  Correct Answer: A

• Question 133:

  The following ARM instruction can be used to return from an exception:

  movs pc, lr

  Apart from the program counter, which register is updated by this instruction?

  A. Ir

  B. r0

  C. CPSR

  D. SCTLR

  Correct Answer: C

• Question 134:

  Assume a little-endian system.

  What is the value of R5 after the execution of the following piece of code?

  

  A. 0xBB

  B. 0xAABBCC22

  C. 0x102

  D. 0xCC

  Correct Answer: A

• Question 135:

  The automatic removal of a cache line from a cache to free the location is known as cache line:

  A. Coherency

  B. Pre-fetch

  C. Eviction

  D. Allocation

  Correct Answer: C

• Question 136:

  Under which of the following circumstances would a DSB instruction be used?

  A. In a multi-threaded system, when two threads need to be synchronized at a particular point

  B. When accessing a peripheral, it is necessary to halt until the memory access is complete

  C. When it is necessary to temporarily disable interrupts while carrying out a particular memory access

  D. In a multiprocessor system, when it is necessary to halt one of the cores while the other completes a critical task

  Correct Answer: B

• Question 137:

  Which one of the following features must any processor support to conform to the ARMv7-A architecture?

  A. NEON (Advanced SIMD)

  B. Thumb-2 technology

  C. TrustZone (Security Extensions)

  D. Generic Interrupt Controller

  Correct Answer: B

• Question 138:

  Which of the following instructions can be used to enter a power saving mode?

  A. PLD

  B. PLI

  C. WFE

  D. DSB

  Correct Answer: C

• Question 139:

  In an ARMv7-R processor, with which level of the memory system is the Memory Protection Unit (MPU) associated?

  A. Level 1

  B. Level 2

  C. Level 3

  D. Level 4

  Correct Answer: A

• Question 140:

  Which of the following options lists the power modes in order of increasing overhead of entry and exit from run mode?

  A. Shutdown, dormant, standby

  B. Dormant, standby, shutdown

  C. Shutdown, standby, dormant

  D. Standby, dormant shutdown

  Correct Answer: D