P0071 Datasheet, PDF (31/43 Pages) Altera Corporation – DE2-115 with LCD Touch Panel and Camera

As soon as the configuration code is downloaded into the FPGA, the I2C Sensor Configuration
block will initial the CMOS sensor via I2C interface. The CMOS sensor is configured as follow:
• Row and Column Size: 800 * 600
• Exposure time: Adjustable
• Pix clock: MCLK*2 = 25*2 = 50MHz
• Readout modes: Binning
According to the settings, we can calculate the CMOS sensor output frame rate is about 44.4 fps.
After the configuration, The CMOS sensor starts to capture and output image data streams, the
CMOS sensor Capture block extracts the valid pix data streams based on the synchronous signals
from the CMOS sensor. The data streams are generated in Bayer Color Pattern format. So it’s then
converted to RGB data streams by the RAW2RGB block.
After that, the Multi-Port SDRAM Controller acquires and writes the RGB data streams to the
SDRAM which performs as a frame buffer. The Multi-Port SDRAM Controller has two write ports
and read ports also with 16-bit data width each. The writing clock is the same as CMOS sensor pix
clock, and the reading clock is provided by the LCD Controller, which is 40MHz.
Finally, the LCD controller fetches the RGB data from the buffer and displays it on the LCD panel
continuously. Because the resolution and timing of the LCD is compatible with SVGA@800*600,
the LCD controller generates the same timing and the frame rate can achieve about 25 fps.
Figure 4-12 Block diagram of the digital camera design
30