STV0672 データシートの表示（PDF） - STMicroelectronics
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STV0672 Datasheet PDF : 41 Pages
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Customer Datasheet, Rev 3.1, 29 November 2000
STV0672-chipsetf-3-1.fm
VV6410
/VV6500
CIF/VGA
Sensor
Video Processor
Video Data[4:0]
SSCL
SSDA
PORB
SCK
SUSPEND
General purpose
housekeeper functions
including AEC,AGC and
AWB
SDA
SCL
RESET
STV0672
Motion JPEG Compression Engine
Compressed Data
Stream Control +
FIFOs
ROM RAM
USB Core/Glue
logic and
command FIFO’s
USB Port
D+
D-
DigiPort
10 (GPIO)
8052 Core
15
MicroPort I/F Ext. Serial I/f to EEPROM
(GPIO)
Interrupts
Clocks
+ PLL
12MHz
XTAL
porb
Figure 1 : Block Diagram of STV0672 Video Processor Module
2.2.1 Video Processor Functions
STV0672 provides a master clock SCLK to the camera module. Each 10-bit pixel value generated by the sensor is transmitted
across the 5wire, (the MSBit of the databus is unused in the current application but it will support future sensors where a 12bit
ADC architecture may be used), databus SDATA[4:0] as a pair of sequential 5-bit nibbles, most significant nibble first. Codes
representing the start and end frames and the start and end of lines are embedded within the video pixel data stream to allow the
video processor receiver to synchronise with the video data which the sensor is generating.
The video processing engine performs the following functions on incoming data
• full colour restoration at each pixel site from Bayer-patterned input data
• matrixing/gain on each colour channel for colour purity
• peaking for image clarity
• gamma correction
• colour space conversion (including hue and saturation control) from raw RGB to YCbCr[4:2:2].
The 2-wire sensor serial interface (SSDA and SSCL) provides control of sensor configuration. Figure 2 below gives a block
overview of the VP module.
2.2.2 Auto Exposure and Gain Control
Control of the sensor exposure is automatically controlled by STV0672. Sensor exposure is evaluated (and, where necessary
29 November 2000
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