TCM8240MD Datasheet, PDF (20/30 Pages) Toshiba Semiconductor – 1.3 Mega pixel sensor chip

TCM8240MD Ver 1.2
JPEG DATA FORMAT
Block diagram
YUV422
MCU
Sensor/DSP
8 lines FIFO
8 lines FIFO
JPEG core
MCU
2MCU
FIFO
JPEG
control
JPEG data structure
The following figure shows JPEG data structure.
SOI DQT SOF DHT SOS Image EOI
SOI
DQT
SOF
DHT
SOS
Image data
EOI(16bit)
Marker code 16'hFFD8
Marker code 16'hFFDB
Marker code 16'hFFC0
Marker code 16'hFFC4
Marker code 16'hFFDA
MCU1 MCU10240 for 1280 × 1024 pixels)
Marker code 16'hFFD9
The following tables show the data structure of DQT,SOF,DHT and SOS respectively.
The host can adjust the picture quality mode (namely compression ratio) by sending a specific quantization
table or by sending Q table gain via IIC bus.
The JPEG encoded data are once stored an internal FIFO memory before outputting.
When data overflow in FIFO happens due to locally increased JPEG data ( locally very low compression) ,
data transmission is stopped after FE code addition and an error flag is written in the register table.
After the host accesses the error flag register, the error flag is automatically reset.
04/12/13
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