Computer Hardware User Manual

VIPER Technical Manual Detailed hardware description

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.