FDC37M607 datasheet(91/182 Pages) SMSC

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Table 39 - ECP Pin Descriptions

NAME

TYPE

DESCRIPTION

nStrobe

During write operations nStrobe registers data or address into the slave

on the asserting edge (handshakes with Busy).

PData 7:0

I/O

Contains address or data or RLE data.

nAck

Indicates valid data driven by the peripheral when asserted. This signal

handshakes with nAutoFd in reverse.

PeriphAck (Busy)

This signal deasserts to indicate that the peripheral can accept data.

This signal handshakes with nStrobe in the forward direction. In the

reverse direction this signal indicates whether the data lines contain

ECP command information or data. The peripheral uses this signal to

flow control in the forward direction. It is an "interlocked" handshake

with nStrobe. PeriphAck also provides command information in the

reverse direction.

PError

(nAckReverse)

Used to acknowledge a change in the direction the transfer (asserted =

forward).

The peripheral drives this signal low to acknowledge

nReverseRequest.

"interlocked"

handshake

with

nReverseRequest. The host relies upon nAckReverse to determine

when it is permitted to drive the data bus.

Select

Indicates printer on line.

nAutoFd

(HostAck)

Requests a byte of data from the peripheral when asserted,

handshaking with nAck in the reverse direction. In the forward direction

this signal indicates whether the data lines contain ECP address or

data. The host drives this signal to flow control in the reverse direction.

It is an "interlocked" handshake with nAck. HostAck also provides

command information in the forward phase.

nFault

(nPeriphRequest)

Generates an error interrupt when asserted. This signal provides a

mechanism for peer-to-peer communication. This signal is valid only in

the forward direction.

During ECP Mode the peripheral is permitted

(but not required) to drive this pin low to request a reverse transfer. The

request is merely a "hint" to the host; the host has ultimate control over

the transfer direction. This signal would be typically used to generate

an interrupt to the host CPU.

nInit

Sets the transfer direction (asserted = reverse, deasserted = forward).

This pin is driven low to place the channel in the reverse direction. The

peripheral is only allowed to drive the bi-directional data bus while in

ECP Mode and HostAck is low and nSelectIn is high.

nSelectIn

Always deasserted in ECP mode.

FDC37M607 Datasheet(PDF) 91 Page - SMSC Corporation

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