at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 677
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at91sam9260-cj
Manufacturer Part Number
at91sam9260-cj
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9260-CJ.pdf
(790 pages)
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39. Image Sensor Interface (ISI)
39.1
Figure 39-1. ISI Connection Example
6221G–ATARM–31-Jan-08
Overview
The Image Sensor Interface (ISI) connects a CMOS-type image sensor to the processor and
provides image capture in various formats. It does data conversion, if necessary, before the stor-
age 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 preview 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:
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.
Table 39-1.
Signal
ISI_VSYNC
ISI_HSYNC
ISI_DATA[11..0]
ISI_MCK
ISI_PCK
1. The hardware with ISI_VSYNC and ISI_HSYNC signals
2. The International Telecommunication Union Recommendation ITU-R BT.656-4 Start-of-
Active-Video (SAV) and End-of-Active-Video (EAV) synchronization sequence.
Image Sensor
data[11..0]
I/O Description
HSYNC
VSYNC
PCLK
CLK
Table 39-3 on page
OUT
Dir
IN
IN
IN
IN
Description
Vertical Synchronization
Horizontal Synchronization
Sensor Pixel Data
Master Clock Provided to the Image Sensor
Pixel Clock Provided by the Image Sensor
680).
ISI_DATA[11..0]
ISI_MCK
ISI_PCK
ISI_VSYNC
ISI_HSYNC
Image Sensor Interface
AT91SAM9260
677
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