LPC47M112 datasheet(91/208 Pages) SMSC

91 / 208 page

Enhanced Super I/O Controller with LPC Interface

Datasheet

SMSC DS – LPC47M112

Page 91

Rev. 02/02/2005

Pword: A port word; equal in size to the width of the LPC interface. For this implementation, PWord is always 8 bits.

A high level.

A low level.

These terms may be considered synonymous:

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.

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.

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.

The port also supports run length encoded (RLE) decompression (required) in hardware. Compression is accomplished

by counting identical bytes and transmitting an RLE byte that indicates how many times the next byte is to be repeated.

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