LPC47S457-NC SMSC [SMSC Corporation], LPC47S457-NC Datasheet - Page 78

• Manufacturer Part Number: LPC47S457-NC
• Description: Advanced I/O with X-Bus Interface
• Manufacturer: SMSC [SMSC Corporation]

(1) = Compatible Mode
(3) = High Speed Mode
Note:
IEEE 1284 Extended Capabilities Port Protocol and ISA Standard, Rev. 1.14, July 14, 1993. This document is available
from Microsoft.
6.7.1
Data Port
ADDRESS OFFSET = 00H
The Data Port is located at an offset of '00H' from the base address. The data register is cleared at initialization by
RESET. During a WRITE operation, the Data Register latches the contents of the internal data bus. The contents of
this register are buffered (non inverting) and output onto the PD0 - PD7 ports. During a READ operation in SPP mode,
PD0 - PD7 ports are buffered (not latched) and output to the host CPU.
Status Port
ADDRESS OFFSET = 01H
The Status Port is located at an offset of '01H' from the base address. The contents of this register are latched for the
duration of a read cycle. The bits of the Status Port are defined as follows:
BIT 0 TMOUT - TIME OUT
This bit is valid in EPP mode only and indicates that a 10 usec time out has occurred on the EPP bus. A logic O means
that no time out error has occurred; a logic 1 means that a time out error has been detected. This bit is cleared by a
RESET. Writing a one to this bit clears the time out status bit. On a write, this bit is self clearing and does not require a
write of a zero. Writing a zero to this bit has no effect.
BITS 1, 2 - are not implemented as register bits, during a read of the Printer Status Register these bits are a low level.
BIT 3 nERR - nERROR
The level on the nERROR input is read by the CPU as bit 3 of the Printer Status Register. A logic 0 means an error has
been detected; a logic 1 means no error has been detected.
BIT 4 SLCT - PRINTER SELECTED STATUS
The level on the SLCT input is read by the CPU as bit 4 of the Printer Status Register. A logic 1 means the printer is on
line; a logic 0 means it is not selected.
SMSC DS – LPC47S45x
CONNECTOR
For the cable interconnection required for ECP support and the Slave Connector pin numbers, refer to the
IBM XT/AT COMPATIBLE, BI-DIRECTIONAL AND EPP MODES
HOST
2-9
10
11
12
13
14
15
16
17
1
PIN NUMBER
68-75
83
80
79
78
77
82
81
66
67
Table 33 − Parallel Port Connector
DATASHEET
nSTROBE
PD<0:7>
nACK
BUSY
PE
SLCT
nALF
nERROR
nINIT
nSLCTIN
STANDARD
Page 78 of 259
nWrite
PData<0:7>
Intr
nWait
(User Defined)
(User Defined)
NDatastb
(User Defined)
nRESET
NAddrstrb
EPP
nStrobe
PData<0:7>
nAck
Busy, PeriphAck(3)
PError,
nAckReverse(3)
Select
nAutoFd,
HostAck(3)
nFault(1)
nPeriphRequest(3)
nInit(1)
nReverseRqst(3)
nSelectIn(1,3)
ECP
Rev. 07/09/2001