LPC47M182 datasheet(111/223 Pages) SMSC

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Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

SMSC LPC47M182

111

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

DATASHEET

Note that all FIFO data transfers are byte wide and byte aligned. Address/RLE transfers are byte-wide

and only allowed in the forward direction.

The host may switch directions by first switching to mode = 001, negotiating for the forward or reverse

channel, setting direction to 1 or 0, then setting mode = 011. When direction is 1 the hardware shall

handshake for each ECP read data byte and attempt to fill the FIFO. Bytes may then be read from the

ecpDFifo as long as it is not empty.

ECP transfers may also be accomplished (albeit slowly) by handshaking individual bytes under program

control in mode = 001, or 000.

7.15

Termination from ECP Mode

Termination from ECP Mode is similar to the termination from Nibble/Byte Modes. The host is permitted to

terminate from ECP Mode only in specific well-defined states. The termination can only be executed while

the bus is in the forward direction. To terminate while the channel is in the reverse direction, it must first be

transitioned into the forward direction.

7.16

Command/Data

ECP Mode supports two advanced features to improve the effectiveness of the protocol for some

applications. The features are implemented by allowing the transfer of normal 8 bit data or 8 bit

commands.

When in the forward direction, normal data is transferred when HostAck is high and an 8 bit command is

transferred when HostAck is low.

The most significant bit of the command indicates whether it is a run-length count (for compression) or a

channel address.

When in the reverse direction, normal data is transferred when PeriphAck is high and an 8 bit command is

transferred when PeriphAck is low. The most significant bit of the command is always zero. Reverse

channel addresses are seldom used and may not be supported in hardware.

Table 7.9 - Channel/Data Commands supported in ECP mode

Forward Channel Commands (HostAck Low)

Reverse Channel Commands (PeripAck Low)

D[6:0]

Run-Length Count (0-127)

(mode 0011 0X00 only)

Channel Address (0-127)

7.17

Data Compression

The ECP port supports run length encoded (RLE) decompression in hardware and can transfer

compressed data to a peripheral. Run length encoded (RLE) compression in hardware is not supported.

To transfer compressed data in ECP mode, the compression count is written to the ecpAFifo and the data

byte is written to the ecpDFifo.

LPC47M182 Datasheet(PDF) 111 Page - SMSC Corporation

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