LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 89

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

(1) = Compatible Mode
(3) = High Speed Mode
Note:
refer to the IEEE 1284 Extended Capabilities Port Protocol and ISA Standard, Rev. 1.14, July 14, 1993.
This document is available from Microsoft.
IBM XT/AT Compatible, Bi-Directional And EPP Modes
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 zero means that no time out error has occurred; a logic 1 means that a time out error has been
detected.
The means of clearing the TIMEOUT bit is controlled by the TIMEOUT_SELECT bit as follows. The
TIMEOUT_SELECT bit is located at bit 2 of CR21.
CONNECTOR
HOST
2-9
10
11
12
13
14
15
16
17
1
For the cable interconnection required for ECP support and the Slave Connector pin numbers,
PIN NUMBER
68-75
83
80
79
78
77
82
81
66
67
Table 35 - Parallel Port Connector
nSTROBE
PD<0:7>
nACK
BUSY
PE
SLCT
nALF
nERROR
nINIT
nSLCTIN
STANDARD
89
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