STPCD0175BTC3 데이터 시트보기 (PDF) - STMicroelectronics

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STPCD0175BTC3

PC Compatible Embedded Microprocessor

STMicroelectronics 

GENERAL DESCRIPTION

scaled. Smooth interpolative scaling in both hori-

zontal and vertical direction are implemented. Col-

our and Chroma key functions are also imple-

mented to allow mixing video stream with non-vid-

eo frame buffer.

The video output passes directly to the RAMDAC

for monitor output or through another optional col-

our space converter (RGB to 4:2:2 YCrCb) to the

programmable anti-flicker filter. The flicker filter is

configured as either a two line filter with gamma

correction (primarily designed for DOS type text)

or a 3 line flicker filter (primarily designed for Win-

dows type displays). The flicker filter is optional

and can be software disabled for use with large

screen area’s of video.

The Video output pipeline of the STPC Client in-

terfaces directly to the external digital TV encoder

(STV0119). It takes a 24 bit RGB non-interlaced

pixel stream and converts to a multiplexed 4:2:2

YCrCb 8 bit output stream, the logic includes a

progressive to interlaced scan converter and logic

to insert appropriate CCIR656 timing reference

codes into the output stream. It facilitates the high

quality display of VGA or full screen video streams

received via the Video input port to standard

NTSC or PAL televisions.

The STPC Client core is compliant with the Ad-

vanced Power Management (APM) specification

to provide a standard method by which the BIOS

can control the power used by personal comput-

ers. The Power Management Unit module (PMU)

controls the power consumption by providing a

comprehensive set of features that control the

power usage and supports compliance with the

United States Environmental Protection Agency’s

Energy Star Computer Program. The PMU pro-

vides following hardware structures to assist the

software in managing the power consumption by

the system.

- System Activity Detection.

- 3 power-down timers detecting system inactivity:

- Doze timer (short durations).

- Stand-by timer (medium durations).

- Suspend timer (long durations).

- House-keeping activity detection.

- House-keeping timer to cope with short bursts

of house-keeping activity while dozing or in stand-

by state.

- Peripheral activity detection.

- Peripheral timer detecting peripheral inactivity

- SUSP# modulation to adjust the system per-

formance in various power down states of the sys-

tem including full power on state.

- Power control outputs to disable power from dif-

ferent planes of the board.

Lack of system activity for progressively longer

period of times is detected by the three power

down timers. These timers can generate SMI in-

terrupts to CPU so that the SMM software can put

the system in decreasing states of power con-

sumption. Alternatively, system activity in a power

down state can generate SMI interrupt to allow the

software to bring the system back up to full power

on state. The chip-set supports up to three power

down states: Doze state, Stand-by state and Sus-

pend mode. These correspond to decreasing lev-

els of power savings.

Power down puts the STPC Client into suspend

mode. The processor completes execution of the

current instruction, any pending decoded instruc-

tions and associated bus cycles. During the sus-

pend mode, internal clocks are stopped. remov-

ing power down, the processor resumes instruc-

tion fetching and begins execution in the instruc-

tion stream at the point it had stopped.

A reference design for the STPC Client is availa-

ble including the schematics and layout files, the

design is a PC ATX motherboard design. The de-

sign is available as a demonstration board for ap-

plication and system development.

The STPC Client is supported by several BIOS

vendors, including the super I/O device used in

the reference design. Drivers for 2D accelerator,

video features and EIDE are available on various

operating systems.

The STPC Client has been designed using mod-

ern reusable modular design techniques, it is pos-

sible to add to or remove the standard features of

the STPC Client or other variants of the 5ST86

family. Contact your local STMicroelectonics sales

office for further information.

8/48

Issue 1.7 - February 8, 2000

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