Test: Memory Protection Unit - Computer Science Engineering (CSE) MCQ

Explanation: The memory protection unit in the ARM architecture divides the memory into eight separate regions. Each region can be small as well as big ranging from 4 Kbytes to 4 Gbytes.

Explanation: The memory region possesses three bits which are the cacheable bit, bufferable bit and access permission bit.

Explanation: In the ARM protection architecture, the memory is divided into some regions of size 4 Kbytes to 4 Gbytes. These regions possess bits called the cacheable bit, buffer bit, and access permitted bits. The regions are numbered as per priority level for which the permission bits takes the precedence if any of the regions gets overlapped.

Explanation: The ARM architecture memory protection unit divides the memory range into different regions of size ranging from 4 Kbytes to 4 Gbytes. Each region is associated with certain bits called the cacheable bit, buffer bit, and access permitted bit. These bits are similar to the permission bit in the ARM memory management unit architecture which are stored in the control register.

Explanation: The cacheable bit and the buffer bit are used to control the behaviour of cache. Depending on the cacheable bit and the buffer bit, the memory access will complete successfully.

Explanation: The memory management unit and the memory protection unit provides security to the processor by trapping the invalid memory accesses before they corrupt other data.

Explanation: The memory protection unit allows a tripped memory down memory management unit in which the memories are partitioned and protected without any address translation. This can remove the time consumption in the address translation thereby increases the speed.

Explanation: The memory protection unit have many advantages over the other units. It can reduce the chip size, cost and power consumption.

Explanation: The memory management unit can be used as a protection unit by disabling the address translation that is, the physical address and the logical address are the same.

Explanation: If a memory access from the software does not access the correct data, an error signal is generated which will start a supervisor level software for the decision.