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Samsung Exynos 5 User Manual

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    							Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
 15-19  
15.3.3.1.13 4-bpp Display (Palette) 
 
 
NOTE: AEN = specifies the transparency selection bit when you select palette output format with alpha channel in 
WPALCON register.  
AEN: 0 = selects ALPHA0 
AEN: 1 = selects ALPHA1 
When the per-pixel blending is set, it blends with the alpha value that AEN selects. 
SFR selects the alpha value as ALPHA0_R, ALPHA0_G, ALPHA0_B, ALPHA1_R, ALPHA1_G, and ALPHA1_B.  
Refer to SFR section for more information.  
 
  (BYSWP=0,HWSWP=0,WSWP=0)
000H
008H
…
D[63:60]
P1
P17
D[59:56]
P2
P18
D[55:52]
P3
P19
D[51:48]
P4
P20
D[47:44]
P5
P21
D[43:40]
P6
P22
D[39:36]
P7
P23
D[35:32]
P8
P24
D[31:28]
P25
D[27:24]
P26
D[23:20]
P27
D[19:16]
P28
D[15:12]
P29
D[11:8]
P30
D[7:4]
P31
D[3:0]
P32
000H
008H
…
P9P10P11P12P13P14P15P16   (BYSWP=1,HWSWP=0,WSWP=0)
000H
008H
…
D[63:60]
P1
P17
D[59:56]
P2
P18
D[55:52]
P3
P19
D[51:48]
P4
P20
D[47:44]
P5
P21
D[43:40]
P6
P22
D[39:36]
P7
P23
D[35:32]
P8
P24
D[31:28]
P25
D[27:24]
P26
D[23:20]
P27
D[19:16]
P28
D[15:12]
P29
D[11:8]
P30
D[7:4]
P31
D[3:0]
P32
000H
008H
…
P9P10P11P12P13P14P15P16
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    							Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
 15-20  
15.3.3.1.14 2-bpp Display (Palette) 
 
NOTE: AEN = specifies the transparency selection bit when you select palette output format with alpha channel in 
WPALCON register. 
AEN: 0 = selects ALPHA0  
AEN: 1 = selects ALPHA1   
When the per-pixel blending is set, it blends with the alpha value that AEN selects. 
SFR selects the alpha value as ALPHA0_R, ALPHA0_G, ALPHA0_B, ALPHA1_R, ALPHA1_G, and ALPHA1_B. 
Refer to SFR section for more information. 
 
 
  ( BYSWP=0, HWSWP=0, WSWP=0 )
000H
008H
…
D[63:62]
P1
P33
D[61:60]
P2
P34
D[59:58]
P3
P35
D[57:56]
P4
P36
D[55:54]
P5
P37
D[53:52]
P6
P38
D[51:50]
P7
P39
D[49:48]
P8
P40
D[47:46]
P41
D[45:44]
P42
D[43:42]
P43
D[41:40]
P44
D[39:38]
P45
D[37:36]
P46
D[35:34]
P47
D[33:32]
P48
000H
008H
…
P9P10P11P12P13P14P15P16
D[31:30]D[29:28]D[27:26]D[25:24]D[23:22]D[21:20]D[19:18]D[17:16]
000H
008H
…
D[15:14]D[13:12]D[11:10]D[9:8]D[7:6]D[5:4]D[3:2]D[1:0]
000H
008H
…
P17
P49
P18
P50
P19
P51
P20
P52
P21
P53
P22
P54
P23
P55
P24
P56
P25
P57
P26
P58
P27
P59
P28
P60
P29
P61
P30
P62
P31
P63
P32
P64
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Exynos 5250_UM 15 Display Controller 
 15-21  
Figure 15-4 illustrates the 16-bpp (5:6:5) Display Types 
 
    Figure 15-4   16-bpp (5:6:5) Display Types 
 
 12345
LCD  Panel
16BPP 5: 5:5+1 Format (Non-Palett e)
A[ 31]  A[ 30]  A[29]  A[ 28]  A[27]  A[26] A[25]  A[ 24]  A[23]  A[22]  A[ 21]  A[20]  A[ 19] A[18]  A[ 17]  A[16]
R4R3R2R1R0G4G3G2G1G0R4B3B2B1B0I
A[ 15]    A[14]  A[ 13]  A[12]  A[ 11]  A[ 10]   A[ 9]     A[8]     A[ 7]      A[6]       A[5]     A[ 4]     A[3]     A[ 2]  A[1]    A[0]
R4R3R2R1R0G4G3G2G1G0R4B3B2B1B0I
12345
LCD  Panel
16BPP 5: 6:5  Format (N on-Palet te)
A[ 31]  A[ 30]  A[29]  A[ 28]  A[27]  A[26] A[25]  A[ 24]  A[23]  A[22]  A[ 21]  A[20]  A[ 19] A[18]  A[ 17]  A[16]
A[ 15]  A[ 14]  A[13]  A[ 12] A[ 11]  A[ 10]   A[ 9]   A[ 8]     A[7]     A[ 6]   A[ 5]     A[ 4]     A[3]    A[2]     A[ 1]     A[0]
R4R3R2R1R0G5G4G3G2G1G0B4B3B2B1B0
R4R3R2R1R0G5G4G3G2G1G0B4B3B2B1B0
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Exynos 5250_UM 15 Display Controller 
 15-22  
15.3.4 Color Space Conversion  
These tables describe examples of color scheme conversion: 
 Color Space Conversion YCbCr to RGB (CSCY2R) 
 Color Space Conversion RGB to YCbCr (CSCR2Y) 
15.3.4.1 Color Space Conversion YCbCr to RGB (CSCY2R) 
 
NOTE: Wide indicates that the RGB data contains a nominal range from 0 to 255. Alternatively, Narrow indicates that the 
RGB data contains a nominal range from 16 to 235. 
 
Coefficient Approximation 
1.164 = (2^7 + 2^4 + 2^2 + 2^0) >> 7 
1.596 = (2^7 + 2^6 + 2^3 + 2^2) >> 7   1,793 = (2^7 + 2^6 + 2^5 + 2^2 + 2^1) >> 7 
0.813 = (2^6 + 2^5 + 2^3) >>7    0.534 = (2^6 + 2^2) >> 7 
0.391 = (2^5 + 2^4 + 2^1) >> 7    0.213 = (2^4 + 2^3 + 2^1 + 2^0) >> 7 
2.018 = (2^8 + 2^1) >> 7     2.115 = (2^8 + 2^3 + 2^2 + 2^1 + 2^0) >> 7 
 
1.371 = (2^8 + 2^6 + 2^4 + 2^3 + 2^2 + 2^1 + 2^0) >> 8 1.540 = (2^8 + 2^7 + 2^3 + 2^1) >> 8 
0.698 = (2^7 + 2^5 + 2^4 + 2^1 + 2^0) >> 8  0.459 = (2^6 + 2^5 + 2^4 + 2^2 + 2^1) >> 8 
0.336 = (2^6 + 2^4 + 2^2 + 2^1) >> 8   0.183 = (2^5 + 2^3 + 2^2 + 2^1 + 2^0) >> 8 
1.732 = (2^8 + 2^7 + 2^5 + 2^4 + 2^3 + 2^1 + 2^0) >> 8 1.816 = (2^8 + 2^7 + 2^6 + 2^4 + 2^0) >> 8  
 
  CSCY2R (Color Space Conversion Y to R)
R =Y + 1.371(Cr - 128)
G =
B =
Y – 0.698(Cr – 128) – 0.336(Cb – 128)
Y + 1.732(Cb – 128)
R =
G =
B =
601709
Narrow
Wide
1.164(Y – 16) + 1.596(Cr - 128)
1.164(Y – 16) – 0.813(Cr – 128) – 0.391(Cb – 128)
1.164(Y – 16) + 2.018(Cb – 128)
Y + 1.540(Cr - 128)
Y – 0.459(Cr – 128) – 0.183(Cb – 128)
Y + 1.816(Cb – 128)
1.164(Y – 16) + 1.793(Cr - 128)
1.164(Y – 16) – 0.534(Cr – 128) – 0.213(Cb – 128)
1.164(Y – 16) + 2.115(Cb – 128)
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Exynos 5250_UM 15 Display Controller 
 15-23  
15.3.4.2 Color Space Conversion RGB to YCbCr (CSCR2Y) 
 
NOTE: Wide indicates that the RGB data contains a nominal range from 0 to 255. Alternatively, Narrow indicates that the 
RGB data contains a nominal range from 16 to 235. 
 
Coefficient Approximation 
0.257 = (2^6 + 2^1) >> 8    0.183 = (2^5 + 2^3 + 2^2 + 2^1 + 2^0) >> 8 
0.504 = (2^7 + 2^0) >> 8    0.614 = (2^7 + 2^4 + 2^3 + 2^2 + 2^0) >> 8 
0.098 = (2^4 + 2^3 + 2^0) >> 8   0.062 = (2^4) >> 8 
0.148 = (2^5 + 2^2 + 2^1) >> 8   0.101 = (2^4 + 2^3 + 2^1) >> 8 
0.291 = (2^6 + 2^3 + 2^1) >> 8   0.338 = (2^6 + 2^4 + 2^2 + 2^1 + 2^0) >> 8 
0.439 = (2^6 + 2^5 + 2^4) >> 8                                                                                    
0.368 = (2^7 – 2^5 – 2^1) >> 8   0.399 = (2^6 + 2^5 + 2^2 + 2^1) >> 8 
0.071 = (2^4 + 2^1) >> 8    0.040 = (2^3 + 2^1) >> 8 
 
0.299 = (2^6 + 2^3 + 2^2 + 2^0) >> 8  0.213 = (2^5 + 2^4 + 2^2 + 2^1 + 2^0) >> 8 
0.587 = (2^7 + 2^4 + 2^2 + 2^1) >> 8  0.715 = (2^7 + 2^5 + 2^4 + 2^2 + 2^1 + 2^0) >> 8 
0.114 = (2^4 + 2^3 + 2^2 + 2^0) >> 8  0.072 = (2^4 + 2^1) >> 8 
0.172 = (2^5 + 2^3 + 2^2) >> 8   0.117 = (2^4 + 2^3 + 2^2 + 2^1) >> 8 
0.339 = (2^6 + 2^4 + 2^3 – 2^0) >> 8  0.394 = (2^6 + 2^5 + 2^2 + 2^0) >> 8 
0.511 = (2^7 + 2^1 + 2^0) >> 8  
0.428 = (2^7 – 2^4 – 2^1) >> 8   0.464 = (2^6 + 2^5 + 2^4 + 2^2 + 2^1 + 2^0) >> 8 
0.083 = (2^4 + 2^2 + 2^0) >> 8   0.047 = (2^3 + 2^2) >> 8  
 
  CSCR2Y (Color Space Conversion R to Y)
Y =0.299R + 0.587G + 0.114B
Cb =
Cr =
- 0.172R - 0.339G + 0.511B + 128
0.511R – 0.428G – 0.083B + 128
0.213R + 0.715G + 0.072B
- 0.117R - 0.394G + 0.511B + 128
0.511R – 0.464G – 0.047B + 128
Y =0.257R + 0.504G + 0.098B + 16
Cb =
Cr =
- 0.148R - 0.291G + 0.439B + 128
0.439R – 0.368G – 0.071B + 128
601709
Narrow
Wide
0.183R + 0.614G + 0.062B + 16
- 0.101R - 0.338G + 0.439B + 128
0.439R – 0.399G – 0.040B + 128
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Exynos 5250_UM 15 Display Controller 
 15-24  
15.3.5 Palette Usage 
15.3.5.1 Palette Configuration and Format Control 
The display controller supports 256-color palette to select color mapping. You can select up to 256 colors from 32-
bit colors by using below formats. 
A 256-color palette consists of 256 (depth)  32-bit SPSRAM. It supports 8:8:8, 6:6:6, 5:6:5 (R: G: B), and other 
formats.  
For Example:  
Refer to A:5:5:5 format, Write palette, as described in Table 15-2.  
Connect VD pin to TFT LCD panel (R(5) = VD[23:19], G(5) = VD[15:11], and B (5) = VD[7:3]). AEN bit enables or 
disables the blending function. Finally, set W PALCON (W1PAL, case window0) register to 0’b101. The 32-bit 
(8:8:8:8) format contains an alpha value directly, without using the alpha value register (ALPHA_0/1).  
Table 15-2 describes the 32-bpp (8:8:8:8) palette data format. 
Table 15-2   32-bpp (8:8:8:8) Palette Data Format 
 
 
Table 15-3 describes the 25-bpp (A: 8:8:8) palette data format. 
Table 15-3   25-bpp (A: 8:8:8) Palette Data Format 
 
  INDEX/Bit Pos.313029282726252423222120191817161514131211109876543210
00h
01h
……
FFh
Numberof VD
ALPHA
ALPHA
ALPHA
……………………………………………………………………………………
R7R6R5R4R3R2R1R0
R7R6R5R4R3R2R1R0
R7R6R5R4R3R2R1R0
--------23222120191817161514131211109876543210
G7G6G5G4G3G2G1G0
G7G6G5G4G3G2G1G0
G7G6G5G4G3G2G1G0
B7B6B5B4B3B2B1B0
B7B6B5B4B3B2B1B0
B7B6B5B4B3B2B1B0   INDEX/Bit Pos.313029282726252423222120191817161514131211109876543210
00h
01h
……
FFh
Numberof VD
……………………………………………………………………………………
R7R6R5R4R3R2R1R0
R7R6R5R4R3R2R1R0
R7R6R5R4R3R2R1R0
--------23222120191817161514131211109876543210
G7G6G5G4G3G2G1G0
G7G6G5G4G3G2G1G0
G7G6G5G4G3G2G1G0
B7B6B5B4B3B2B1B0
B7B6B5B4B3B2B1B0
B7B6B5B4B3B2B1B0
---AEN----
---AEN----
---AEN----
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Exynos 5250_UM 15 Display Controller 
 15-25  
Table 15-4 describes the 19-bpp (A: 6:6:6) palette data format. 
Table 15-4   19-bpp (A: 6:6:6) Palette Data Format 
 
Table 15-5 describes the 16-bpp (A: 5:5:5) palette data format. 
Table 15-5   16-bpp (A: 5:5:5) Palette Data Format 
 
 
15.3.5.2 Palette Read/Write 
Do not access palette memory when the Vertical Status (VSTATUS) register is ACTIVE. Enable VSTATUS to 
perform Read/Write operation on the palette. 
 
  INDEX/Bit Pos.313029282726252423222120191817161514131211109876543210
00h
01h
……
FFh
Numberof VD
……………………………………………………………………………………
R5R4R3R2R1R0
--------232221201918151413121110765432
G5G4G3G2G1G0B5B4B3B2B1B0---AEN----
-------
-------
------
------
R5R4R3R2R1R0G5G4G3G2G1G0B5B4B3B2B1B0
AEN------
R5R4R3R2R1R0G5G4G3G2G1G0B5B4B3B2B1B0
AEN------   INDEX/Bit Pos.313029282726252423222120191817161514131211109876543210
00h
01h
……
FFh
Numberof VD
……………………………………………………………………………………
R4R3R2R1R0
--------2322212019151413121176543
G4G3G2G1G0B4B3B2B1B0---AEN----
-------
-------
------
------
------
------
---
---
R4R3R2R1R0G4G3G2G1G0B4B3B2B1B0
AEN---
R4R3R2R1R0G4G3G2G1G0B4B3B2B1B0
AEN---
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Exynos 5250_UM 15 Display Controller 
 15-26  
15.3.6 Window Blending 
15.3.6.1 Overview  
The main function of the VPRCS module is window blending. The display controller consists of five window layers 
(win0 to win4).  
 
Example of Application: 
The system uses:  
win0 as OS window, full TV screen window, and so on 
win1 as small (next channel ) TV screen with win2 as menu 
win3 as caption 
win4 as channel information 
win3 and win4 have color limitation when it uses color index with Color LUT. This feature reduces the data rate of total 
system. Thus, it enhances the system performance. 
 
Example of Total Five Windows: 
win0 (base): Local/ (YCbCr, RGB without palette) 
win1 (Overlay1): RGB with palette  
win2 (Overlay2): RGB with palette 
win3 (Caption): RGB (1/2/4) with 16-level Color LUT 
win4 (Cursor): RGB (1/2) with 4-level Color LUT 
 
Overlay Priority 
win4 > win3 > win2 > win1>win0 
 
Color Key 
Ensure to set the register value of Color Key register by using 24-bit RGB format.
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Exynos 5250_UM 15 Display Controller 
 15-27  
Blending Equation  
 
Win01 (R, G, B) = Win0 (R, G, B) x b1 + Win1 (R, G, B) x a1 
Win012 (R/G/B) = Win01 (R/G/B) x b2 + Win2 (R/G/B) x a2 
Win0123 (R/G/B) = Win012 (R/G/B) x b3 + Win3 (R/G/B) x a3 
WinOut (R/G/B) = Win0123 (R/G/B) x b4 + Win4 (R/G/B) x a4 
 
where,  
Win0(R) = Window 0s Red data 
Win0(G) = Window 0s Green data 
Win0(B) = Window 0s Blue data 
Win1(R) = Window 1s Red data 
... 
b1 = Backgrounds Data blending equation1 factor 
a1 = Foregrounds Data blending equation1 factor 
b2 = Backgrounds Data blending equation2 factor 
a2 = Foregrounds Data blending equation2 factor 
 
 
 
AR (G, B)01 = AR (G, B)0 x q1 + AR (G, B)1 x p1 
AR (G, B)012 = AR (G, B)01 x q2 + AR (G, B)2 x p2 
AR (G, B)0123 = AR (G, B)012 x q3 + AR (G, B)3 x p3 
 
 where,  
AR0 = Window 0s Red blending factor 
AG0 = Window 0s Green blending factor 
AB0 = Window 0s Blue blending factor 
AR1 = Window 1s Red blending factor... 
AR01 = Window01s Red blending factor (alpha value blending between AR0 and AR1) 
AG01 = Window01s Green blending factor (alpha value blending between AG0 and AG1) 
AB01 = Window01s Blue blending factor (alpha value blending between AB0 and AB1) 
AR012 = Window012s Red blending factor (alpha value blending between AR01 and AR2) 
... 
q1 = Backgrounds Alpha value blending equation1 factor 
p1 = Foregrounds Alpha value blending equation1 factor 
q2 = Backgrounds Alpha value blending equation2 factor 
p2 = Foregrounds Alpha value blending equation2 factor…
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Exynos 5250_UM 15 Display Controller 
 15-28  
Figure 15-5 illustrates the blending equation. 
 
    Figure 15-5   Blending Equation 
 
< Default blending equation > 
 
Data blending>  
B = B  (1-alphaA) + A  alphaA 
 
Alpha value blending> 
alphaB = 0 (= alphaB x 0 + alphaA  0)  
 
 Blending
alphaAalphaBAB
alphaB’B’
B’           =     a x A  +  b x B
alphaB’  =     p x alphaA  +  q x alphaB
a/b/p/q = 0
or    1
or    alphaA
or    1 - alphaA
or    alphaB
or    1 - alphaB
or    A
or    1 - A
or    B
or    1 - B
‘a’ is controlled by ‘A_FUNC’ @ BLENDEQ register
‘b’           “        by ‘B_FUNC’ @ BLENDEQ register
‘p’           “        by ‘P_FUNC’ @ BLENDEQ register
‘q’           “        by ‘Q_FUNC’ @ BLENDEQ register
or    ALPHA0
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