ADE3800SXT datasheet(79/138 Pages) STMICROELECTRONICS

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ADE3800SXT 数据表(PDF) 79 Page - STMicroelectronics

部件名	ADE3800SXT

功能描述	Analog LCD Display Engine for XGA and SXGA Resolutions with Embedded LVDS and RSDS Transmitters

PDF	138 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

79 / 138 page

79/138

ADE3800

Total alpha is calculated as follows:

r_o = (r_i[9:0] + ( ({lut_data[23:16],lut_data[23:22]} - r_i[9:0]) * total_alpha) )

g_o = (g_i[9:0] + ( ({lut_data[15:8] ,lut_data[15:14]} - g_i[9:0]) * total_alpha) )

b_o = (b_i[9:0] + ( ({lut_data[7:0] ,lut_data[7:6]}

- b_i[9:0]) * total_alpha) )

total_alpha_selector[7:0] = (glbl_alpha[3:0] * color_alpha[3:0])

The total alpha read from a LUT of 32 entries that are normalized, where the range is total_alpha =

0,1,2,3,4...16; and only the 5 msb’s of total_alpha_selector[7:3] are used as select.

i.e. 16 represents 1.0 "no alpha blending at all". Figure 14 shows how the Alpha Blending is

constructed:

Figure 14: OSD Alpha Blending

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