AM3874 datasheet(271/361 Pages) TI

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AM3874, AM3871

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SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

8.12 Imaging Subsystem (ISS)

The device Imaging Subsystem captures and processes pixel data from external image and video inputs.

The inputs can be connected to the Image Processing block through the Parallel Camera Interface

(CAM). . In addition, a Timing control module provides flash strobe and mechanical shutter interfaces. The

features of each component of the ISS are described below.

•

Parallel Camera (CAM) interface features:

–

Input format

•

Bayer pattern Raw (up to 16bit) or YCbCr 422 (8bit or 16bit) data.

•

ITU-R BT.656/1120 standard format

–

Generates HD/VD timing signals and field ID to an external timing generator, or can synchronize to

the external timing generator.

–

Support for progressive and interlaced sensors (hardware support for up to 2 fields and firmware

supports for higher number of fields, typically 3-, 4-, and 5-field sensors.

•

Image Sensor Interface (ISIF) features:

–

Support for up to 32K pixels (image size) in both the horizontal and vertical direction

–

Color space conversion for non-Bayer pattern Raw data

–

Digital black clamping with Horizontal/Vertical offset drift compensation

–

Vertical Line defect correction based on a lookup table

–

Color-dependent gain control and black level offset control

–

Ability to control output to the DDR2/DDR3 via an external write enable signal

–

Down sampling via programmable culling patterns

–

A-law/DPCM compression

–

Generating 16-, 12- or 8-bit output to memory

•

Two independent Resizers

–

Providing two different sizes of outputs simultaneously on one input

–

Maximum line width is 5376 and 2336, respectively

–

YUV422 to YUV420 conversion

–

Data output format: RGB565, ARGB888, YUV422 co sited and YUV4:2:0 planar

–

Resizer Ratio: x1/4096 approximately x20

–

Input from memory

•

Timing control module features:

–

STROBE signal for flash pre-strobe and flash strobe

–

SHUTTER signal for mechanical shutter control

–

Global reset control

For more detailed information on the ISS, see the ISS Overview section, the ISS Interfaces section, and

the ISS ISP section of the Watchdog Timer chapter of the AM387x Sitara™ ARM Processors Technical

Reference Manual (Literature Number: SPRUGZ7).

Peripheral Information and Timings

271

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