LPC47M14X datasheet(84/205 Pages) SMSC

84 / 205 page

SMSC DS – LPC47M14X

Page 84

Rev. 03/19/2001

6.9.2

Extended Capabilities Parallel Port

ECP provides a number of advantages, some of which are listed below. The individual features are explained in greater

detail in the remainder of this section.

High performance half-duplex forward and reverse channel Interlocked handshake, for fast reliable transfer Optional

single byte RLE compression for improved throughput (64:1) Channel addressing for low-cost peripherals Maintains link

and data layer separation Permits the use of active output drivers permits the use of adaptive signal timing Peer-to-peer

capability.

Vocabulary

The following terms are used in this document:

assert:

When a signal asserts it transitions to a "true" state, when a signal deasserts it transitions to a "false"

state.

forward:

Host to Peripheral communication.

reverse:

Peripheral to Host communication

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

nErrIntrEn 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.

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