Intel MCS48 User Manual page 377

8291
GPIB
Addressing
Each
device
connected
to
the
GPIB
must have
at least
one
address
whereby
the controller device
in
charge
of the
bus
can
configure
it
to
talk, listen,
or send
status.
An
8291
implementation
of the
GPIB
offers the user three
addressing
modes
from which
the device
can be
initialized
for
each
application.
The
first
of
these
modes
allows
for
the device
to
have two
separate primary addresses.
The
second
mode
allows the user
to
implement
a
single
talker/listener with a
two byte address (primary address
+
secondary
address).
The
third
mode
again allows
for
two
distinct
addresses but
in
this instance,
they
can each have
a
two-byte address. However,
this
mode
requires that the
secondary addresses be passed
to
the
microprocessor
for
verification.
These
three addressing
schemes
are
deV
cribed
in
more
detail
in
the discussion
of
the
Address
registers.
TABLE
1.
IEEE 488
INTERFACE STATE
MNEMONICS
Mnemonic
State
Represented
ACDS
Accept Data
State
ACRS
Acceptor
Ready
State
AIDS
Acceptor
Idle
State
AMRS
Acceptor Not Ready
State
AFRS
Affirmative
Poll
Response
State
AV/NS
Acceptor Wait
for
New
Cycle State
J
CACS
Controller Active State
,
J
CADS
Controller
Addressed
State
|
I
CAWS
Controller Active
Wait
State
I
I
CIDS
Controller
Idle
State
I
I
CPPS
Controller
Parallel Poll State
'
I
CPWS
Controller
Parallel Poll
Wait
State
]
J
CSBS
Controller
Standby
State
.
CSNS
Controller Service
Not Requested
State
|
I
CSRS
Controller Service Requested
State
i
I
CSWS
Controller
Synchronous
Wait State
I
[_CTRS
Controller Transfer State
'
DCAS
Device Clear
Active State
DCIS
Device Clear
Idle
State
DTAS
Device Trigger Active State
DTIS
Device Trigger
Idle
State
LACS
Listener Active State
LAOS
Listener
Addressed
State
LIDS
Listener
Idle
State
LOOS
Local State
LPAS
Listener Primary
Addressed
State
LPIS
Listener
Primary
Idle State
LWLS
Local With Lockout
State
NPflS
Negative
Poll
Response
State
Mnemonic
State
Represented
PACS
Parallel Poll
Addressed
to
Configure
State
PPAS
Parallel Poll Active State
PPIS
Parallel Poll Idle
State
PPSS
Parallel Poll
Standby
State
PUCS
Parallel Poll
Unaddressed
to
Configure
State
REMS
Remote
State
RWLS
Remote
With Lockout
State
SACS
System
Control Active
State
SDYS
Source Delay
State
SGNS
Source Generate
State
SIAS System
Control
Interface Clear Active State
SIDS Source
Idle
State
SIIS
System
Control
Interface Clear
Idle
State
SINS
System
Control
Interface Clear
Not
Active State
SIWS
Source
Idle
Wait
State
SNAS
System
Control Not Active State
SPAS
Serial Poll Active State
SPIS
Serial Poll Idle State
SPMS
Serial Poll
Mode
State
SRAS
System
Control
Remote
Enable
Active State
SRIS System
Control
Remote
Enable
Idle State
SRNS
System
Control
Remote
Enable Not
Active State
SRQS
Service
Request
State
STRS
Source
Transfer State
SWNS
Source
Wait
for
New
Cycle
State
TACS
Talker Active State
TADS
Talker
Addressed
State
TIDS
Talker
Idle State
TPIS
Talker Primary
Idle
State
The
Controller function
is
implemented on
the Intel® 8292.
8-87
00229A