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参数资料
| 型号： | OM5721 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | STB5660 Set-Top Box STB concept |
| 中文描述： | STB5660机顶盒机顶盒的概念 |
| 文件页数： | 7/20页 |
| 文件大小： | 100K |
| 代理商： | OM5721 |
1999 May 05
7
Philips Semiconductors
Product specification
STB5660 (Set-Top Box) STB concept
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.
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