
VIPER Technical Manual
Detailed hardware description
© 2007 Eurotech Ltd Issue E
35
TFT panel data bit mapping to the VIPER
Panel data bus bit
18-bit TFT
12-bit TFT
9-bit TFT
FPD 15
R5
R3
R2
FPD 14
R4
R2
R1
FPD 13
R3
R1
R0
FPD 12
R2
R0
-
FPD 11
R1
-
-
GND R0 -
-
FPD 10
G5
G3
G2
FPD 9
G4
G2
G1
FPD 8
G3
G1
G0
FPD 7
G2
G0
-
FPD 6
G1
-
-
FPD 5
G0
-
-
FPD 4
B5
B3
B2
FPD 3
B4
B2
B1
FPD 2
B3
B1
B0
FPD 1
B2
B0
-
FPD 0
B1
-
-
GND B0
-
-
The PXA255 cannot directly interface to 18-bit displays, as its colour palette
RAM has 5 bits for red, 6 bits for green and 5 bits for blue, since the human eye
can distinguish more shades of green than of red or blue.