Sage-Tips

What is the instruction buffer register?

A MBR (Memory Buffer Register) is a temporary register where the contents of the last memory fetch is stored. Similarly IBR (Instruction Buffer Register) is a temporary register where the opcode of the currently fetched instruction is stored. Note that these are definitions as per basic computer architecture.

What does the instruction register?

An instruction register contains the actual or encoded instructions, not the addresses. It’s part of the CPU control unit. We can find several registers in the CPU control unit like index register, data register, and instruction register.

What is the difference between MBR and IBR?

1 Answer. The difference is in their working during the fetch part of the instruction cycle in a computer processor. The MBR stores any data for input or output, whereas, the IR stores only the instruction that needs to be decoded by the control unit.

Why do we need buffer register?

It acts as a buffer allowing the processor and memory units to act independently without being affected by minor differences in operation. This register holds the contents of the memory which are to be transferred from memory to other components or vice versa.

What is difference between buffer and register?

The main difference between register and buffer is that a register is a temporary storage area in the processor that allows transferring data faster while buffer is a temporary storage area in main memory that holds data before using them.

Where is the instruction register?

In terms of computer hardware, an instruction register is an element in the central processing unit (CPU) of a computer or other device that holds the programming instruction that will be executed at the start of the next clock cycle as dictated by other parts of the CPU.

Which type of register is instruction register?

The instruction register is another type of central processing unit register that is used to store the instruction that is currently executed or that will be decoded. In processors, the instruction register holds each instruction in it, and then it can be executed by the processors.

What is the purpose of the data register and address register?

For example, a data register may store individual values referenced being by a currently running program. An address register contains memory addresses, which reference different blocks of memory within the system RAM.

What is instruction buffer register (IBR)?

Similarly IBR (Instruction Buffer Register) is a temporary register where the opcode of the currently fetched instruction is stored. Note that these are definitions as per basic computer architecture. The idea of these registers holding last fetched instruction or last fetched memory data is to aid in debug of any issues.

What is the function of a a register in a CPU?

A register is a small amount of storage available as part of a CPU. The control unit tells the ALU what operation to perform on that data, and the ALU stores the result in an output register. The control unit moves the data between these registers, the ALU, and memory.

What is the best definition of buffer?

1 : any of various devices or pieces of material for reducing shock or damage due to contact. 2 : a means or device used as a cushion against the shock of fluctuations in business or financial activity. 3 : something that serves as a protective barrier: such as. a : buffer state.

What is a buffer5 memory?

5 : a section of computer memory for temporarily storing information especially : one that accepts information at one rate and delivers it at another The streaming video feed continues to download into the buffer while the computer starts playing the movie.