MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU’s control unit that holds the instruction currently being executed or decoded.

Detailed explanation-2: -current instruction register (CIR)-holds the instruction that is currently being decoded and executed.

Detailed explanation-3: -2.1. To execute an instruction, the processor copies the instruction code from the program memory into the instruction register (IR). It can then be decoded (interpreted) by the instruction decoder, which is a combinational logic block which sets up the processor control lines as required.

Detailed explanation-4: -The instruction or data held in that memory address is sent along the data bus to the memory data register (MDR). The instruction or data held in the MDR is copied into the current instruction register (CIR). The instruction or data held in the CIR is decoded and then executed .

Detailed explanation-5: -Committed information rate (CIR) is the guaranteed rate at which a Frame Relay network will transfer information under normal line conditions. In Frame Relay networks, CIR refers to the bandwidth associated with a logical connection in a permanent virtual circuit (PVC).