SPC8104 S-MOS Systems, SPC8104 Datasheet - Page 104

• Manufacturer Part Number: SPC8104
• Description: VGA LCD CONTROLLER
• Manufacturer: S-MOS Systems

11.4 LCD Gray Scale Lookup Table Architecture
Hardware Functional Specification
SP1-78
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
f r o m E G A p a l e t t e
p i x e l c o l o r v a l u e
Figure 23 : LCD Gray Scale Lookup Table
G r a y s c a l e l o o k u p
t a b l e d a t a r e g i s t e r
m s b
C5
C4
C3
C2
C1
C0
1st access
3 C 9 h
table index
lookup
6 bit
Green-only: GS = G5G4G3G2G1G0
NTSC: GS = [5R+9G+2B] / 16
Gray Scale Weighting Function
7
x
3 C
3 D
3 E
3 F
x
0
1
2
3
4
5
D5 D4
(on Write data)
X15-SP-001-08.1
lookup table
2nd access
gray scale
64x4 bit
or
ï
ï
D3 D2 D1 D 0
ArchitectureSource: a000082.cdr
0
table data
lookup
output
4 bit
3rd access
weighted pixel gray
scale output 0-F to
display
msb
D3
D2
D1
D0
412-1.0
SPC8104