LPC47M182 datasheet(102/223 Pages) SMSC

102 / 223 page

Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

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

102

SMSC LPC47M182

DATASHEET

Chip may modify nWRITE, PDIR and nPDATA in preparation of the next cycle.

Table 7.2 - EPP Pin Descriptions

EPP

SIGNAL

EPP NAME

TYPE

EPP DESCRIPTION

nWRITE

nWrite

This signal is active low. It denotes a write operation.

PD<0:7>

Address/Data

I/O

Bi-directional EPP byte wide address and data bus.

INTR

Interrupt

This signal is active high and positive edge triggered. (Pass

through with no inversion, Same as SPP).

nWAIT

nWait

This signal is active low. It is driven inactive as a positive

acknowledgement from the device that the transfer of data is

completed. It is driven active as an indication that the device

is ready for the next transfer.

nDATASTB

nData Strobe

This signal is active low. It is used to denote data read or

write operation.

nRESET

nReset

This signal is active low. When driven active, the EPP

device is reset to its initial operational mode.

nADDRSTB

Address

Strobe

This signal is active low. It is used to denote address read or

write operation.

Paper End

Same as SPP mode.

SLCT

Printer

Selected

Status

Same as SPP mode.

nERR

Error

Same as SPP mode.

Note 1: SPP and EPP can use 1 common register.

Note 2: nWrite is the only EPP output that can be over-ridden by SPP control port during an EPP cycle. For correct

EPP read cycles, PCD is required to be a low.

7.10.1 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.

7.10.2 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:

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