Embedded System Structure MCQ Quiz – Objective Question with Answer for Embedded System Structure

A stack is a memory that is allocated to the program in the last-in, first-out pattern. The stack pointer contains the memory address of the stack.

SIMM is a single in-line memory module is a kind of memory module, which contains random access memory used in computers of the early 1980s and 1990s.

The use of By 1 organization is declined because of the wider data path devices. But it is still used in parity bit and were used in SIMM memory.

By 1 organization is replaced with By 4 organization because of its reduced address bus and complexity.

The address bus of the 8086 is 20-bit and the data bus is 16-bit in size. So the physical address can be calculated by shifting the segment register by 4 to left and by adding the address bus to it.

The wider memories support 16-bits because it can integrate more number of the interface logic so that the time consumed by the latches and buffers removes the memory access thus allowing the slower parts to be used in wait state free designs.

A zig-zag package of memory is a plastic package used for DRAM. The leads of this package are arranged in a zigzag manner.

The M68000 family has a 16 Mbyte addressing range. The PowerPC family has a larger 4 Gbyte range and the DSP56000 has a 128-kilo word address space.

The delays occurring in the memory management unit can destroy the accuracy of the algorithms and avoid this, the linear addressing range should be increased.

Most of the systems have a multitasking operating system in which the software consists of modular blocks of codes which run under the control of the operating system. There are three ways for allocating memory to these blocks. The first way distributes the block in a predefined way. The second way of allocating memory includes relocation or position independence in the software and the other way of allocating memory to the block is the address translation in which the logical address is translated to the physical address.

The memory allocation of the modular blocks can be done by writing the software program in a relocatable or position-independent manner which can execute anywhere in the memory map, but relocatable code must have the same address between its data and code segments. This is used to avoid the use of absolute addressing modes which are replaced by the relative addressing modes.

The memory management unit handles physical addresses. Therefore, the virtual or the logical address is first translated to the physical address.

The memory partitioning provides stability to the multitasking system so that the errors within one task will not corrupt the other tasks.

The M68000 uses memory partitioning by the use of function code or by the combination of superscalar signals and the Harvard architecture.

The finer grain protection of memory management is achieved by the addition of an extra description bit to an address to declare its status. The memory management unit can detect an error if the task attempts to access memory that has not been allocated to it or a certain kind of mismatch occurs.

In the workstation and the UNIX operating system, the virtual memory technique is frequently used in which the main memory is divided into different segments and pages. These pages will have a virtual address which can increase the address spacing.

The dual-in-line package consists of two lines of legs on both sides of the plastic or ceramic. Most commonly used are BIOS EPROMs, DRAM, and SRAM.

DIMM is a special version of SIMM which is a 168-bits wider bus and looks similar to a larger SIMM. The wider bus increases the memory speed and change in supply voltage.

The SIMM is basically a subassembly, not a package. It is a small board that possesses a finger connection on the bottom and sufficient memory on the board in order to make up the required configuration.

For increasing the speed and reducing the power consumption, it is necessary to reduce the power supply. Today’s CPUs and memories have a 3.3V supply or even lower instead of the signal level from 0 to 5V. DIMMs are described by their voltage, speed, and memory type respectively as 3.3V 133MHz SDRAM DIMM.