82091AA Datasheet, PDF (20/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
2 6 Parallel Port Interface
The 82091AA parallel port is a multi-function inter-
face that can be configured for one of four hardware
modes (see Section 4 0 AIP Configuration) The
hardware modes are ISA-Compatible PS 2-Com-
patible EPP and ECP modes These parallel port
modes support the compatibility nibble byte EPP
and ECP parallel interface protocols described in the
IEEE 1284 standard The operation and use of the
interface signal pins are a function of the parallel
port hardware mode selected and the protocol used
Table 1 shows a matrix of the 82091AA parallel port
signal names and corresponding signal names for
each of the protocols Sections 2 6 1 – 2 6 5 provide
a signal description for the five interface protocols
Note that the 82091AA hardware operations are the
same for Compatibility and Nibble protocols The
signals however are controlled and used differently
via software and the peripheral device
Table 1 Parallel Port Signal Name Cross Reference
82091AA
Signal
Names
STROBE
BUSY
ACK
SELECT
PERROR
FAULT
INIT
AUTOFD
PD 7 0
SELECTIN
Compatibility
Protocol Signal
Names
Strobe
Busy
Ack
Select
PError
Fault
Init
AutoFd
Data 8 1
SelectIn
Nibble Protocol
Signal Names
PtrBusy
PtrClk
Xflag
AckDataReq
DataAvail
HostBusy
Byte Protocol
Signal Names
HostCLK
PtrBusy
PtrClk
Xflag
AckDataReq
DataAvail
HostBusy
Data 8 1
EPP Protocol
Signal Names
Write
Wait
Intr
Xflag
AckDataReq
DataAvail
Init
DStrb
Data 8 1
AStrb
ECP Protocol
Signal Names
HostClk
PeriphAck
PeriphClk
Xflag
AckReverse
PeriphRequest
ReverseRequest
HostAck
Data 8 1
ECP Mode
NOTE
Not all parallel port signal pins are used for certain parallel port interface protocols These signals are labeled ‘‘ ’’
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