ade3800 STMicroelectronics, ade3800 Datasheet - Page 78

• Manufacturer Part Number: ade3800
• Description: Analog Lcd Display Engine For Xga And Sxga Resolutions With Embedded Lvds And Rsds Transmitters
• Manufacturer: STMicroelectronics

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4.14.2 Color LUT Calculation
4.14.3 Alpha Blending
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Register Description by Block
1bpp
2bpp
3bpp
4bpp
FG[23:20]
PI[15:12]
All Row Attributes are assigned as shown:
Character Attributes for Row Type 0 are assigned as shown:
Character Attributes for Row Type 1 are assigned as shown:
Character Attributes for Row Type 2 are assigned as shown:
Color pointers in the CLUT [5:0], where:
PI = 4-bit Palette Index (RT0/RT1 have 1--bit PI; RT2 has 4bit PI) ;
P1, P2, P3, P4 = 5-bit programmable pointers, clut_1bpp, clut_2bpp, clut_3bpp, clut_4bpp,
respectively;
PixelData = 2-bit, 3-bit or 4-bit value depending on the character depth 2bpp, 3bpp or 4bpp,
respectively;
C = 4-bit background/foreground color (used only for 1bpp characters);
tcon = OSD_CTRL0[1] * tcon_window where tcon_window is a signal from the TCON block specifying the
window to be highlighted.
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P1 + BC) % 64
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P2 + PixelData) % 64
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P3 + PixelData) % 64
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P4 + PixelData) % 64
4-bit Alpha is applied to the OSD providing 16 levels (6.25% steps) of blending.
Alpha = 0F:no blending at all (100% OSD data).
Alpha = 00:full blending (100% input video).
The OSD region has a 4-bit global alpha and each RGB has a 4-bit color alpha.
PI[11]
BG[19:16]
CD[11:10]
RowType0
YPOS[23:12]
CD[10]
CD1[15:14]
HF[9]
HF[9]
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P1 + BC) % 64
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P2 + PixelData) % 64
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P3 + PixelData) % 64
(tcon*OSD_CTRL0[2]*32 +
!tcon*32*PI + P4 + PixelData) % 64
CD0[13:12]
VF[8]
VF[8]
RowType1
HVF[11:10]
PI[9]
(tcon*OSD_CTRL0[2]*(8 + PI%8)*4 +
!tcon*4*PI + P1 + BC) % 64
(tcon*OSD_CTRL0[2]*(8 + PI%8)*4 +
!tcon*4*PI + P2 + PixelData) % 64
(tcon*OSD_CTRL0[2]*(8 + PI%8)*4 +
!tcon*4*PI + P3 + PixelData) % 64
(tcon*OSD_CTRL0[2]*(8 + PI%8)*4 +
!tcon*4*PI + P4 + PixelData) % 64
XPOS[11:0]
CID[7:0]
CID[7:0]
CID[7:0]
CR[8:2]
RowType2
ADE3800
TR[1:0]