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EN0-001 Exam Dumps : ARM Accredited Engineer

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ARM Accredited Engineer Questions and Answers

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Question 1

In an ARMv7-A system, the following C function calculates a simple checksum for an input data packet of variable length. The checksum is defined to be the sum of all of the 16-bit data items in the packet modulo 65536. The parameter data_items contains the number of 2-byte data items in the packet, and it cannot be zero by design.

When using an ARM compiler, which TWO of the following optimizations could improve the performance of this code? (Choose two)

Options:

A.

Use a do/while loop instead of a for loop

B.

Change the type of sum to be an unsigned short

C.

Change the type of i to be an unsigned int

D.

Use signed variables instead of unsigned variables

E.

Declare sum as a global variable

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Question 2

The effect of clicking the Stop button in a debugger is to:

Options:

A.

Put the processor(s) into debug state.

B.

Force the processor to execute a BKPT instruction

C.

Hold the processor in a Reset condition

D.

Re-initialize the memory contents.

Question 3

A standard performance benchmark is being run on a single core ARM v7-A processor. The performance results reported are significantly lower than expected. Which of the following options is a possible explanation?

Options:

A.

L1 Caches and branch prediction are disabled

B.

The Embedded Trace Macrocell (ETM) is disabled

C.

The Memory Management Unit (MMU) is enabled

D.

The Snoop Control Unit (SCU) is disabled

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