Eurotech Appliances VIPER / VIPER-LITE PXA255 - Manual (Page 35)

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.