Altera Cyclone II FPGA Starter - Manual (Page 38)

4–16 Altera Corporation
Cyclone II FPGA Starter Development Kit User Guide October 2006
VGA Display
6. Download the Raw_Data_Gray.dat file into the SRAM as described
in
“Displaying Another Image from a Downloaded Bitmap File” on
page 4–12 .
The ImgConv tool also generates a Raw_Data_BW.dat file (and its
corresponding TXT format) for the black and white version of the image.
The BW Threshold in
Table 4–1 defines the threshold for judging black or
white level. Raw_Data_BW.txt fills in the MIF/Intel Hex format for M4K
SRAM.
Table 4–1. BW Threshold
Image Source R/G/B Band Filter
B&W Threshold
Filter
Output Result
(640x480)
Color Picture R/G/B N/A Raw_Data_Gray
Color Picture R/G/B (optional) BW Threshold Raw_Data_BW +
Raw_Data_BW.txt
Grayscale Picture N/A N/A Raw_Data_Gray
Grayscale Picture N/A BW Threshold Raw_Data_BW +
Raw_Data_BW.txt