SAA7215HSSLASHC2 datasheet(7/20 Pages) PHILIPS

7 / 20 page

1999 Aug 25

Philips Semiconductors

Preliminary speciﬁcation

STB5860 (Set-Top Box) STB concept

OM5730

• In terms of interfaces, the SAA7219 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

• SAA7219 is able to control with a high speed clock

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

control the SAA7215 family 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 family 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 family 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 DMU (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 family 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 family 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 family processes LPCM

audio data and can interface gluelessly with an external

multi-channel audio decoder such as the SAA2505,

through IEC 958 interface.

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