FDC37C93XAPM datasheet(94/280 Pages) SMSC

94 / 280 page

Table 37 - 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.)

WAIT

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.

DATASTB

nData Strobe

This signal is active low.

It is used to denote data read or

write operation.

RESET

nReset

This signal is active low.

When driven active, the EPP

device is reset to its initial operational mode.

ADDRSTB

nAddress

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.

PDIR

Parallel Port

Direction

This output shows the direction of the data transfer on the

parallel port bus. A low means an output/write condition and

a high means an input/read condition.

This signal is

normally a low (output/write) unless PCD of the control

Note 1: SPP and EPP can use one 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.

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