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Intel iapx 432 Baby Furniture User Manual

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iAPX

432

Interface

Processor

Architecture

Reference

Manual

5-2.

PHYSICAL

REFERENCE

mDE

ADDRESSING

In

physical

reference

mode

the

object

reference

attribute

of

a

window

is

replaced

b¥

a

24-bit

segment

base

address.

Upon

recognition

of

a

subrange

address

reference

the

IP

determines

the

transfer

displacement

as

in

logical

reference

node.

It

forms

the

transfer

address

b¥

adding

the

displacement

to

the

segment

base

address.

The 432

transfer

length

is

always

set

to

2

16

bytes

so

that

no

length

of

transfer

faults

can

occur.

No

system

objects

are

used

in

physical

reference

node

addressing.

Note

that

in

physical

reference

mode, window 0

may

be

opened

in

either

random

or

block

transfer

mode

and window 1

may

be opened

onto

either

432

memory

space

or

the

interconnect

address

space.

An

IP

operating

in

physical

node

may

also

change

the

characteristics

of

windCM

4,

the

control

windCM.

5-3.

PHYSICAL

REFERENCE

mDE

FUNCI'ICNS

The

IP

controller

may

request

execution

of

four

functions

in

physical

reference

node.

These corresJ.X)nd

closely,

but

are

not

always

identical,

to

logical

reference

functions.

The

request,

execution,

fault

handling,

and

completion

phases

of

physical

reference

mode

operations

are

similar

to

the

logical

reference

mode

counterparts.

See

the

function

summary

in

Appendix B

for

detailed

descriptions

of

the

operation

of

these

functions.

The

physical

reference

mode

fUnctions

are

o

Sm'

PERIPHERAL

SUBSYSTEM

t-DDE

~

o

READ

PRCCESSOR

STATUS

AND

CLOCK

o

SEND

TO

PROCESSOR

o

ALTER

MAP

AND

SELECl'

PHYSICAL

SEG1ENI'.

5-2

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