Cirrus Logic EP93xx - Manual (Page 302)

8-38 DS785UM1
Copyright 2007 Cirrus Logic
Graphics Accelerator
EP93xx User’s Guide
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If BG = ‘1’ in the BLOCKCTRL register, a ‘0’ causes a pixel
fill from the BACKGROUND register. If BG = ‘0’ in the
BLOCKCTRL register, a ‘0’ is transparent.
When drawing solid lines, write LINEPATTERN =
0x000F_FFFF.