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參數(shù)資料
| 型號： | SAA8115HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital Camera USB Interface(數(shù)字照相USB接口) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-486-1, LQFP-144 |
| 文件頁數(shù)： | 11/56頁 |
| 文件大小： | 177K |
| 代理商： | SAA8115HL |
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2000 Jan 27
11
Philips Semiconductors
Preliminary specification
Digital camera USB interface
SAA8115HL
8
FUNCTIONAL DESCRIPTION
8.1
Video synchronization
The video synchronization module is capable of locking to
the video signal implementing a horizontal gate signal
HREF (HREF = HIGH when data is valid) and a VS signal
indicating the start of a new video frame.
8.2
Frame rate converter and SDRAM interface
An optional SDRAM (external) can be accessed using the
SDRAM interface which is integrated in the SAA8115HL.
Pinning and functionality is based on the NEC
μ
PD4516161 (16 Mbits) and the NEC
μ
PD4564163
(64 Mbits).
When used, the memory is placed at the video input of the
SAA8115HL before prefilter, scaler and compression
engine. At this point only YUV 4 : 2 : 2 formatted data is
available.
The use of the SDRAM is twofold:
Lowering the frame rate. The memory enables to store
one frame of video accumulated at a specific rate and to
read it out at a lower frame rate. For interline VGA
sensors, the input frame rate is either 30 fps or 15 fps.
It can be lowered with a factor of 2, 3, 6, 16 or 32.
For CIF or medium resolution PAL, the input frame rate
is only 30 fps
Enhanced snapshot mode. Storage of full size VGA
pictures in 4 : 2 : 2 format which can be retrieved upon
dedicated software command.
8.3
Video formatter: downsampler and cutter
This block is used to achieve the required output format
from the specified sensor formats (see Fig.3). It works for
YUV 4 : 2 : 2 only. In RAW mode this block is by-passed to
create a full resolution snapshot.
Horizontally a downsampling from 512 or 640 to either
384, 320, 192 or 160 or from 352 to 176 is necessary.
The horizontal downsampling is performed with the use of
a Variable Phase Delay filter (VPD-4). This filter can
realize the needed downsample factors. To avoid aliasing,
this module also contains a prefilter which has four modes:
No filter for medium resolution PAL (512
×
288) to CIF
(352
×
288) or SIF (320
×
240)
Prefilter A (3 taps) for VGA (640
×
480) to CIF or SIF,
CIF to QCIF (176
×
144) or QSIF (160
×
120)
Prefilter B (7 taps) for medium resolution PAL to QCIF
or QSIF
Prefilter A combined with prefilter B-comb (13 taps) for
VGA to QCIF or QSIF.
Prefilter B-comb is similar to prefilter B but inserts extra
taps with amplification 0.
The vertical downsampling in PAL mode is from CIF to
QCIF only. This is done via a vertical filter A (3 taps).
In VGA mode a 4 taps polyphase filter is applied to scale
from 640
×
480 to CIF and QCIF.
From a full size QCIF picture a sub-QCIF (128
×
96) cut
can be made. For the zoomed sub-QCIF format, the origin
(upperleftcorner)isprogrammableviaSNERTin13 steps
(both horizontally and vertically), so that an electronic pan
and tilt is possible.
The incoming 4 : 2 : 2 data is vertically filtered to 4 : 2 : 0,
in order to be sent over USB, by throwing away colour
samples. In the even lines the V-samples are discarded, in
the odd lines the U-samples.
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| SAA8116ET | Digital PC-camera signal processor including microcontroller and USB interface |
| SAA8116HL | Digital PC-camera signal processor, microcontroller andUSB interface |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA8116 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital PC-camera signal processor including microcontroller and USB interface |
| SAA8116104BE | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC PC WEB CAMERA DSP WITH USB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| SAA8116104BE-S | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC PC WEB CAMERA DSP WITH USB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| SAA8116104BE-T | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC PC WEB CAMERA DSP WITH USB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| SAA8116ET | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital PC-camera signal processor including microcontroller and USB interface |
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