LPC47M182 datasheet(103/223 Pages) SMSC

103 / 223 page

Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

SMSC LPC47M182

103

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

DATASHEET

PeriphClk, nAck

HostAck, nAutoFd

PeriphAck, Busy

nPeriphRequest, nFault

nReverseRequest, nInit

nAckReverse, PError

Xflag, Select

ECPMode, nSelectln

HostClk, nStrobe

Reference Document: IEEE 1284 Extended Capabilities Port Protocol and ISA Interface Standard, Rev

1.14, July 14, 1993. This document is available from Microsoft.

The bit map of the Extended Parallel Port registers is:

NOTE

data

PD7

PD6

PD5

PD4

PD3

PD2

PD1

PD0

ecpAFifo Addr/RLE

Address or RLE field

dsr

nBusy

nAck

PError

Select

nFault

dcr

Direction

ackIntEn

SelectI

nInit

autofd

strobe

cFifo

Parallel Port Data FIFO

ecpDFifo

ECP Data FIFO

tFifo

Test FIFO

cnfgA

cnfgB

compress intrValue

Parallel Port IRQ

Parallel Port DMA

ecr

MODE

nErrIntrE

dmaEn serviceIntr

full

empty

Note 1: These registers are available in all modes.

Note 2: All FIFOs use one common 16 byte FIFO.

Note 3: The ECP Parallel Port Config Reg B reflects the IRQ and DMA channel selected by the Configuration

Registers.

7.11

ECP Implementation Standard

This specification describes the standard interface to the Extended Capabilities Port (ECP). All LPC

devices supporting ECP must meet the requirements contained in this section or the port will not be

supported by Microsoft. For a description of the ECP Protocol, please refer to the IEEE 1284 Extended

Capabilities Port Protocol and ISA Interface Standard, Rev. 1.14, July 14, 1993. This document is

available from Microsoft.

7.11.1 Description

The port is software and hardware compatible with existing parallel ports so that it may be used as a

standard LPT port if ECP is not required. The port is designed to be simple and requires a small number of

gates to implement. It does not do any “protocol” negotiation, rather it provides an automatic high

burst-bandwidth channel that supports DMA for ECP in both the forward and reverse directions.

Small FIFOs are employed in both forward and reverse directions to smooth data flow and improve the

maximum bandwidth requirement. The size of the FIFO is 16 bytes deep. The port supports an automatic

handshake for the standard parallel port to improve compatibility mode transfer speed.

LPC47M182 Datasheet(PDF) 103 Page - SMSC Corporation

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