Question

What is control word? Give the structure of a control word.

Answer 1

Control word is defined as a word whose individual bits represent the various control signal. The control words related to an instruction that is stored in microprogram memory. It is a set of micro-instructions in a micro-routine.

• In control words, microoperations are specified, they are known as microinstructions.
• Each microinstruction specifies one or more microoperations that are performed.
• The Control Word consists of bits, and each bit corresponds to a function or commands such as Pause, Stop, Enable, Start, Stop, Move, Jog, etc.