CompArch Ch. 20 Review

A single micro-operation generally involves which of the following?
a transfer between registers
a transfer between a register and an external bus
a simple ALU operation
all of the above

Each instruction executed during an instruction cycle is made up of shorter ______.
executions
subcycles
steps
none of the above

__________ are the functional, or atomic, operations of a processor.
Micro-operations
Interrupts
Subcycles
All of the above

The _________ is connected to the address lines of the system bus.
MBR
MAR
PC
IR

The ________ is connected to the data lines of the system bus.
MAR
PC
MBR
IR

The ________ holds the address of the next instruction to be fetched.
IR
PC
MAR
MBR

The _________ holds the last instruction fetched.
PC
MBR
MAR
IR

The groupings of micro-operations must follow which rule?
a sequence of events does not need to be followed
use read to and write from the same register in one time unit
conflicts must be avoided
all of the above

The _______ designates the state of the processor in terms of which portion of the cycle it is in.
ICC
BSA
ALE
ISC

Machine cycles are defined to be equivalent to ________ accesses.
flag
bus
clock
path

The ________ portion of the control unit issues a repetitive sequence of pulses.
instruction register
flag
control bus signals
clock

The ________ pulse signals the start of each machine cycle from the control unit and alerts external circuits.
AC
INSTR
ALE
OUT

Which of the following is an Intel 8085 external signal?
CLK(OUT)
read control
HOLDA
all of the above

The __________ module handles multiple levels of interrupt signals.
interrupt control
incrementer address latch
serial I/O control
decrementer address latch