PC97307VUL datasheet(21/218 Pages) NSC

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Signal/Pin Connection and Description

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SOUT2,1

148, 138

UART1,

UART2

Output

Group 17

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 with CFG3. SOUT1 is multiplexed with CFG0.

STB

112

Parallel Port

I/O

Group 13

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.

This signal is multiplexed wiTH WRITE.

STEP

FDC

Output

Group 16

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

programmable rate to move the head during a seek operation.

SWITCH

APC

Input

Group 7

Switch On/Off – Indicates a request to the APC to switch the power

on or off. When VDD does not exist, a high to low transition on this

signal indicates a Switch On request. When VDD exists, a high to low

transition on this pin indicates a Switch Off request.

The pin has an internal pull-up of 1 M

Ω (nominal), a schmitt-trigger

input buffer and debounce protection of at least 16 msec.

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.

VBAT

RTC and

APC

Input

Battery Power Supply – Power signal from the battery to the Real-

Time Clock (RTC) or for Advanced Power Control (APC) when VCCH

is less than VBAT (by at least 0.5 V). VBAT includes a UL protection

resistor.

VCCH

RTC and

APC

Input

VCC Help Power Supply – This signal provides power to the RTC or

APC when VCCH is higher than VBAT (by at least 0.5 V).

VDD

1, 24, 61,

100, 121,

140

Power

Supply

Input

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

the digital circuitry.

VSS

2, 11, 25,

40, 60,

101, 120,

130, 139

Power

Supply

Output

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

WAIT

111

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. It is internally connected

to a nominal 25 K

Ω pull-down resistor.

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

more information.

WDATA

FDC

Output

Group 16

Write Data (FDC) – This output signal holds the write

precompensated serial data that is written to the selected floppy disk

drive. Precompensation is software selectable.

WDO

156

Power

Management

Output

Group 10

WATCHDOG Out – This output pin becomes low when a

WATCHDOG time-out occurs. See “The WATCHDOG Feature” on

page 172. This pin is conﬁgured by bit 6 of the SuperI/O

Conﬁguration Register 2.

This signal is multiplexed with GPIO17.

Signal/Pin

Name

Number

Module

I/O and

Group #

Function

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