Samsung S5PC100 User Manual page 1041

S5PC100 USER'S MANUAL (REV1.0) DISPLAY CONTROLLER
Example: Window n's blending factor decision (n=0, 1, 2, 3, 4). For more information, refer to "Section SFR".
Figure 9.1-7 Blending Factor Decision
NOTE: Alpha value is {DATA [15:12], DATA [15:12]} (4bit->8bit expanding), if DATA [15:12] (BPPMODE_F = b'1110,
ARGB4444 format) is used to blend.
9.1-27