IBM 7090 - 4.0.00 IBM 7606 MULTIPLEXOR; 4.1.00 MULTIPLEXOR FUNCTIONAL UNITS

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E

cycles

are

used

when

information

is

to

be

moved

between

core

storage

and

the

CPU

to

execute

an

instruction.

L

cycles

are

used

to

execute

an

instruction

when

information

from

core

storage

is

not

needed.

Most

instructions

use

only

one

E

or

L

cycle

for

their

execution,

but

some

instruc-

tions

require

multiple

E

or

L

cycl~s.

For

example:

a

convert

instruction

requires

several

E

cycles;

a

multiply

instruction

requires

several

L

cycles.

37

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