PC87373 datasheet(3/174 Pages) NSC

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Features (Continued)

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Revision 1.1

Musical Instrument Digital Interface (MIDI) Port

— Compatible with MPU-401 UART mode

— 16-byte Receive and Transmit FIFOs

— Loopback mode support

Game Port (GMP)

— Compatible with the Legacy Game Port deﬁnition

— Full digital implementation

— Supports up to two analog joysticks

General-Purpose Modules

General-Purpose I/O (GPIO) Ports

— 13 GPIO ports powered by VSB3

— Each pin individually conﬁgured as input or output

— Programmable features for each output pin:

❏

Drive type (open-drain, push-pull or TRI-STATE)

❏

TRI-STATE on detection of falling VDD3 for

VSB3-powered pins driving VDD-supplied devices

— Programmable option for internal pull-up resistor on

each input pin

— Lock option for the conﬁguration and data of each

output pin

— 12 GPIO ports generate IRQ/SIOPME for wake-up

events; each GPIO has separate:

❏

Enable control of event status routing to IRQ

❏

Enable control of event status routing to SIOPME

❏

Polarity and edge/level selection

❏

Programmable debouncing

Glue Functions

— Software selectable alternative functionality, through

pin multiplexing

— Generates the power-related signals:

❏

Main Power good

❏

Power distribution control (for switching between

Main and Standby regulators)

❏

Resume reset (Master Reset) according to the

5V standby supply status

❏

Main power supply turn on (PS_ON)

❏

Rambus SCK clock gating

— Voltage translation between 3.3V levels (DDC) and

5V levels (VGA) for the SMBus serial clock and data

signals

— Isolation circuitry for the SMBus serial clock and

data signals

— Buffers PCI_RESET to generate three reset output

signals

— Generates “highest active supply” reference voltage

❏

Based on 3.3V and 5V Main supplies

❏

Based on 3.3V and 5V Standby supplies

— High-current LED driver control for Hard Disk Drive

activity indication

— CNR downstream codec, dynamic control

Fan Speed Control and Monitor (FSCM)

— Supports tachometers with one or two pulses per

revolution

— Speed monitoring for three fans, including:

❏

Digital ﬁltering of the tachometer input signal

❏

16-bit fan speed data

❏

Alarm for fan speed slower than programed

threshold

❏

Alarm for fan stopped

— Speed control lines with Pulse Width Modulation

(PWM) for three fans

❏

Output signal in the range of 6 Hz to 93.75 KHz

❏

Duty cycle resolution of 1/256

Power Management

Supports ACPI Specification Revision 2.0b, July 27,

2000

System Wake-Up Control (SWC)

— Optional

routing

events

generate

SCI

(SIOPME) on detection of:

❏

Keyboard or Mouse events

❏

Ring Indication RI on each of the two serial ports

❏

General-Purpose Input Events from the 12 GPIO

pins

❏

IRQs of the Keyboard and Mouse Controller

❏

IRQs of the other internal modules

— Optional routing of the SCI (SIOPME) to generate

IRQ (SERIRQ)

— Implements the GPE1_BLK of the ACPI General Pur-

pose (Generic) Register blocks with “child” events

— VSB3-powered event detection and event-logic con-

ﬁguration

Enhanced Power Management (PM), including:

— Special conﬁguration registers for power down

— Low-leakage pins

— Low-power CMOS technology

— Ability to disable all modules

— High-current LED drivers control (two LEDs) for

power status indication with:

❏

Standard blinking, controlled by software

❏

Advanced blinking, controlled by power supply sta-

tus, sleep state or software

❏

Special blinking, controlled by power supply sta-

tus, sleep state and software bit

— VBAT-powered indication of the Main power supply

state before an AC power failure

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