Exam 20: Control Unit Operation

The execution of a program consists of the sequential execution of instructions.

The control unit controls the internal flow of data.

The ____________ of a processor causes the processor to step through a series of micro-operations in the proper sequence,based on the program being executed.

The _________ holds the last instruction fetched.

The ________ portion of the control unit issues a repetitive sequence of pulses.

In a __________ implementation the control unit is essentially a state machine circuit and its input logic signals are transformed into a set of output logic signals,which are the control signals.

Knowing the machine instruction set does not play a part in knowing the functions that the processor must perform.

The __________ module handles multiple levels of interrupt signals.

The ________ is connected to the data lines of the system bus.

Control unit implementation techniques fall into two categories: microprogrammed implementation and ___________ implementation.

Machine cycles are defined to be equivalent to ________ accesses.

A single micro-operation generally involves which of the following?

__________ are the functional,or atomic,operations of a processor.

The ____________ generated by the control unit cause the opening and closing of logic gates,resulting in the transfer of data to and from registers and the operation of the ALU.

The ________ holds the address of the next instruction to be fetched.

A cycle is made up of a sequence of micro-operations.

The __________ register contains the value to be stored in memory or the last value read from memory.

The prefix __________ refers to the fact that each step is very simple and accomplishes very little.

The six things needed to specify the function of a processor are: operations (opcodes),addressing modes,registers,I / O module interface,memory module interface,and ________.

Each micro-operation of the fetch cycle involves the movement of data into or out of a register.