. 1.The offset field of a main memory address is used to determine: if the cache

Question

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1.The offset field of a main memory address is used to determine:

if the cache entry is valid

if the cache entry is the desired block

the location of the desired data in the cache block

none of these

2.Cache mapping is necessary because:

the address generated by the CPU must be converted to a cache location

cache is so small that its use requires a map

cache is larger than main memory and mapping allows us to store multiple copies of each piece of data from main memory

none of the above

3.The RTN for the first step in the fetch-decode-execute cycle is:

MAR PC

PC PC + 1

IR MAR

IR MBR

4.To prevent the whole WSC from going offline if power is lost, a WSC has an _______

uninterruptible power supply

signal tower

charger

battery

if the cache entry is valid

if the cache entry is the desired block

the location of the desired data in the cache block

none of these

Explanation / Answer

1.The offset field of a main memory address is used to determine:

Ans:B

if the cache entry is the desired block

The offset field of a main memory address is used to determine only if the cache entry is the desired block

2.Cache mapping is necessary because:

Ans: A

The address generated by the CPU mustbe converted to a cache location.

3. The RTN for the first step in the fetch-decode-execute cycle is:

Ans: MAR <--PC

Explanation: We can use register notation to describe the cycle.

MAR<--PC

MBR<--[memory] MAcaddress, PC<--[PC]+1 ;increment pc for next cycle

CIR<-[MBR]

CIR will decode the execute

4)To prevent the whole WSC from going offline if power is lost, a WSC has an _______

Ans: A

uninterruptible power supply

WCS contains uninterruptible power supply to prevent the whole WSC from going offline if power is lost

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