at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 963

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

45. Image Sensor Interface (ISI)
45.1
Figure 45-1. ISI Connection Example
6249D–ATARM–20-Dec-07
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 45-1.
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 45-3 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
966).
AT91SAM9263 Preliminary
ISI_DATA[11..0]
ISI_MCK
ISI_PCK
ISI_VSYNC
ISI_HSYNC
Image Sensor Interface
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