PC97307 datasheet(15/218 Pages) NSC

15 / 218 page

Signal/Pin Connection and Description

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1.2

SIGNAL/PIN DESCRIPTIONS

Table 1-1 lists the signals of the part in alphabetical order and shows the pin(s) associated with each. Table 1-2 on page 23

lists the X-Bus Data Buffer (XDB) signals that are multiplexed and Table 1-3 on page 23 lists the pins that have strap func-

tions during reset.

The Module column indicates the functional module that is associated with these pins. In this column, the System label in-

dicates internal functions that are common to more than one module.

The I/O and Group # column describes whether the pin is an input, output, or bidirectional pin (marked as Input, Output or

I/O, respectively). This column also specifies the DC characteristics group to which this pin belongs. See Section 13.2 on

page 183 for details.

Refer to the glossary for an explanation of abbreviations and terms used in this table, and throughout this document. Use

the Table of Contents to find more information about each register.

TABLE 1-1. Signal/Pin Description Table

Signal/Pin

Name

Number

Module

I/O and

Group #

Function

A15-0

29-26,

23-12

ISA-Bus

Input

Group 1

ISA-Bus Address – A15-0 are used for address decoding on any

access except DMA accesses, on the condition that the AEN signal

is low. See Address Decoding in Section 2.2.2 on page 25.

ACK

113

Parallel Port

Input

Group 3

Acknowledge – This input signal is pulsed low by the printer to

indicate that it has received data from the parallel port. It is pulled up

by an internal nominal 25 K

Ω pull-up resistor.

AFD

119

Parallel Port

I/O

Group 13

Automatic Feed – When this signal is low the printer should

automatically feed a line after printing each line. This pin is in TRI-

STATE after a 0 is loaded into the corresponding control register bit.

An external 4.7 K

Ω pull-up resistor should be attached to this pin.

For Input mode see bit 5 in “Control0, Second Level Offset 00h” on

page 126.

This signal is multiplexed with DSTRB. See Table 6-12 on page 134

for more information.

AEN

ISA-Bus

Input

Group 1

DMA Address Enable – This input signal disables function selection

via A15-0 when it is high. Access during DMA transfer is not affected

by this signal.

ASTRB

118

Parallel Port

Output

Group 1

Address Strobe (EPP) – This signal is used in EPP mode as an

address strobe. It is active low.

This signal is multiplexed with SLIN. See Table 6-12 on page 134 for

more information.

BADDR1,0

136, 134

Conﬁguration

Input

Group 5

Base Address Strap Pins 0 and 1 – These pins determine the base

addresses of the Index and Data registers, the value of the Plug and

Play ISA Serial Identiﬁer and the conﬁguration state immediately after

reset. These pins are pulled down by internal 30 K

Ω resistors.

External 10 K

Ω pull-up resistors to V

DD should be employed.

BADDR1 is multiplexed with RTS1. BADDR0 is multiplexed with

DTR1 and BOUT1. See Table 2-2 on page 25 and Section 2.1 on

page 24.

BOUT2,1

144, 134

UART1,

UART2

Output

Group 17

Baud Output – This multi-function pin provides the associated serial

channel Baud Rate generator output signal if test mode is selected,

i.e., bit 7 of the EXCR1 register is set. (See Section “Bit 7 - Baud

Generator Test (BTEST)” on page 155.)

After Master Reset this pin provides the SOUT function.

BOUT2 is multiplexed with DTR2 and CFG1. BOUT1 is multiplexed

with DTR1 and BADDR0.

BUSY

111

Parallel Port

Input

Group 2

Busy – This pin is set high by the printer when it cannot accept

another character. It is internally connected to a nominal 25 K

Ω pull-

down resistor.

This signal is multiplexed with WAIT. See Table 6-12 on page 134 for

more information.

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