Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

 853

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

The Image Sensor Interface (ISI) connects a CMOS-type image sensor to the processor and provides image cap-
ture in various formats. It does data conversion, if necessary, before the storage in memory through DMA.

The ISI supports color CMOS image sensor and grayscale image sensors with a reduced set of functionalities.

In grayscale mode, the data stream is stored in memory without any processing and so is not compatible with the
LCD controller.

Internal FIFOs on the preview and codec paths are used to store the incoming data. The RGB output on the pre-
view path is compatible with the LCD controller. This module outputs the data in RGB format (LCD compatible) and
has scaling capabilities to make it compliant to the LCD display resolution (See 

).

Several input formats such as preprocessed RGB or YCbCr are supported through the data bus interface.

It supports two modes of synchronization:

1.

The hardware with ISI_VSYNC and ISI_HSYNC signals 

2.

The International Telecommunication Union Recommendation

 Start-of-Active-Video 

(SAV) and End-of-Active-Video (EAV) synchronization sequence.

Using EAV/SAV for synchronization reduces the pin count (ISI_VSYNC, ISI_HSYNC not used). The polarity of the
synchronization pulse is programmable to comply with the sensor signals.

• ITU-R BT. 601/656 8-bit mode external interface support

• Support for ITU-R BT.656-4 SAV and EAV synchronization

• Vertical and horizontal resolutions up to 2048 x 2048

• Preview Path up to 640*480

• Support for packed data formatting for YCbCr 4:2:2 formats

• Preview scaler to generate smaller size image

I/O Description

ISI_VSYNC

IN

Vertical Synchronization

ISI_HSYNC

IN

Horizontal Synchronization

ISI_DATA[11..0]

IN

Sensor Pixel Data

ISI_MCK

OUT

Master Clock Provided to the Image Sensor

ISI_PCK

IN

Pixel Clock Provided by the Image Sensor