OM5721 데이터 시트보기 (PDF) - Philips Electronics

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OM5721

STB5660 (Set-Top Box) STB concept

Philips Electronics 

Philips Semiconductors

STB5660 (Set-Top Box) STB concept

Product specification

OM5721

• In terms of interfaces, the SAA7214 interfaces with

basic STB peripherals such as UART, smart card

interface, IEEE 1284, but also with the next generation

high speed interfaces such as IEEE 1394

• SAA7214 is able to control with a high speed clock

(40.5 MHz) DRAMs, Flash, EEPROM and is able to

control the SAA7215 as a memory mapped device with

a maximum sustained rate of 40.5 Mbytes/s, which

enables fast graphic update in the second SDRAM

• SAA7215 has a scalable memory architecture: 16 Mbits

for low-end and 32 Mbits for mid/high-end applications.

Furthermore, there is a full decoupling of MPEG

processing and graphics/CPU control buses and

control, which offers a high bandwidth and low latency

for CPU when accessing the graphics memory.

• SAA7215 features 5 independent graphics planes that

can address all the known digital TV video and graphics

requirements:

– Background: where still pictures can be displayed in

the background

– Foreground: where broadcast graphics and the user

interface can be displayed

– Video: where still or moving video is displayed

– Cursor: implemented in hardware to offer fast

responses times.

• Graphics are processed internally in high resolution

RGB 4 : 4 : 4 format which provides the best quality in

graphics rendering as well as for mixing with video in

4 : 2 : 2 format

• A dedicated Data Manipulation Unit (bit block transfer

type) offers very fast block move and data manipulation

during the transfers. This can be used to perform scaling

of graphics, transfers from 4 : 2 : 0 to CLUT or RGB

formats, or fast block move in MPEG or graphics

SDRAMs.

• SAA7215 offers flexible scaling features, including letter

box conversion that is now becoming a needed features

for broadcasters

• Two independent mixed video/graphics and video-only

signal paths are implemented and allow software

disabling of the user interface for recording on VCR

• Integrated digital video encoder with Y/C, CVBS and

RGB outputs reduce the Bill of Materials (BOM) and also

the board space, while still offering the possibility to

have access to the YUV digital bus through CCIR-656

interface.

• SAA7215 is ready for future audio features such as

AC-3 or high fidelity LPCM audio, such as requested by

the world-wide DVD standard, but also for high-end STB

in the USA. SAA7215 processes LPCM audio data and

can interface gluelessly with an external multi-channel

audio decoder such as the SAA2505, through IEC 958

interface.

1999 May 05

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