PC87309VLJ datasheet(17/192 Pages) NSC

17 / 192 page

Signal/Pin Connection and Description

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RI2,1

97,87

UART1

Input

Group 1

Ring Indicators (Modem) – When low, this signal indicates that a

telephone ring signal has been received by the modem.

The RI1 and RI2 pins have schmitt-trigger input buffers.

RI2 is multiplexed with DENSEL and available only in Two-UART

mode.

RTS2,1

98,88

UART1,

UART2

Output

Group 12

Request to Send – When low, these output signals indicate to the

modem or other data transfer device that the corresponding UART1

or UART2 is ready to exchange data.

A Master Reset (MR) sets RTS to inactive high. Loopback operation

holds it inactive.

RTS2 is multiplexed on pin 98 with IRSL1 and ID1, and available only

in Two-UART mode. RTS1 is multiplexed on pin 88 with BADDR1.

SIN2,1

99,89

UART1,

UART2

Input

Group 1

Serial Input – This input signal receives composite serial data from

the communications link (peripheral device, modem or other data

transfer device).

SIN2 is multiplexed on pin 99 with ID3 and available only in Two-

UART mode.

SLCT

Parallel Port

Input

Group 2

Select – This input signal is set active high by the printer when the

printer is selected. This pin is internally connected to a nominal 25 K

Ω

pull-down resistor.

SLIN

Parallel Port

I/O

Group 8

Select Input – When this signal is active low it selects the printer.

This signal is in TRI-STATE after a 0 is loaded into the corresponding

control register bit. Use an external 4.7 K

Ω pull-up resistor.

This signal is multiplexed with ASTRB.

SOUT2,1

100,92

UART1,

UART2

Output

Group 12

Serial Output – This output signal sends composite serial data to the

communications link (peripheral device, modem or other data transfer

device).

The SOUT2,1 signals are set active high after a Master Reset (MR).

SOUT2 is multiplexed on pin 100 with IRRX2, IRSL0 and ID0, and is

available only in Two-UART mode.

SOUT1 is multiplexed on pin 92 with CFG0.

STB

Parallel Port

I/O

Group 8

Data Strobe – This output signal indicates to the printer that valid

data is available at the printer port.

This signal 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 employed.

For Input mode see bit 5, described in Section 4.5.16.

This signal is multiplexed with WRITE.

STEP

FDC

Output

Group 11

Step – This output signal issues pulses to the disk drive at a software

programmable rate to move the head during a seek operation.

ISA-Bus

Input

Group 1

DMA Terminal Count – The DMA controller issues TC to indicate the

termination of a DMA transfer. TC is accepted only when a DACK

signal is active.

TC is active high in PC-AT mode, and active low in PS/2 mode.

TRK0

FDC

Input

Group 1

Track 0 – This input signal indicates to the controller that the head of

the selected floppy disk drive is at track 0.

VDD

90,41

Power

Supply

Input

Main 5 V Power Supply – This signal is the 5 V supply voltage for

the digital circuitry.

VSS

91,65,40,

Power

Supply

Output

Ground – This signal provides the ground for the digital circuitry.

WAIT

Parallel Port

Input

Group 2

Wait – In EPP mode, the parallel port device uses this signal to

extend its access cycle. WAIT is active low. This signal is multiplexed

with BUSY. See TABLE 4-12 on page 101 for more information.

Signal/Pin

Name

Number

Module

I/O and

Group #

Function

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