AS0260CSSC28SUD20 datasheet(42/83 Pages) ONSEMI

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AS0260 DS Rev. G Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AS0260: 1/6-Inch 1080P High-Definition (HD) System-On-A-Chip (SOC) Digi-

tal Image Sensor

JPEG Encoder

The JPEG compression engine in the AS0260 is a highly integrated, high-performance

solution that provides for low power consumption and programmability of JPEG

compression parameters for image quality control.

The JPEG encoding block is designed for continuous image flow and is ideal for low

power applications. After initial configuration for a target application, it can be

controlled easily for instantaneous stop or restart. A flexible configuration and control

interface allows for full programmability of various JPEG-specific parameters and tables.

JPEG Encoding Highlights

• Sequential DCT (baseline) ISO/IEC 10918-1 JPEG-compliant

• Grayscale and YCbCr 4:2:2 format compression

• Support for JPEG 4:2:0 output for image widths that are less than 960 pixels

• Support for two pairs of programmable quantization tables

• Support for user-defined quantization tables

• Quality/compression ratio control capability

• 30 fps JPEG capability at full resolution with or without JFIF-compliant header

• Programmable automatic control of compression ratio

• JPEG encoded stream can work in continuous mode or spoof mode

• JPEG encoded stream working in continuous mode can only transmit on the parallel

output port

• In spoof mode, data is output with programmed spoof frame sizes; dummy pixels

may be padded as necessary

• Support for Scalado SpeedTags™

• MIPI data types can be used to output a status segment with a different datatype code

than the JPEG data

• Spoof-frame height can be ignored in spoof mode

• Optional JFIF header generation

JPEG Output Interface

JPEG Data

JPEG data can be output in both the parallel and the serial MIPI streams. In the parallel

output interface, JPEG data is output on the 8-bit parallel bus DOUT[7:0], with FV, LV, and

PIXCLK. JPEG output data is valid when both FV and LV are asserted. When the JPEG

data output for the frame completes, LV and FV are de-asserted.

The AS0260 can transmit JPEG data using two different formats: JPEG continuous

stream and JPEG spoof stream. In both formats, JPEG status segments containing infor-

mation (resolution, file size, and status) about the image can be inserted into the output

streams. The following sections describe the two streaming methods.

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