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VIPER Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue E 34
Flat panel display support
The PXA255 processor contains an integrated LCD display controller that permits 1, 2
and 4-bit grey-scale, and 8 or 16-bit colour pixels. A 256-byte palette RAM provides
flexible colour mapping capabilities. The LCD display controller supports active (TFT)
and passive (STN) LCD displays.
The PXA255 can drive displays with a resolution up to 800x600, but as the PXA255
has a unified memory structure, the bandwidth to the application decreases
significantly. If the application makes significant use of memory, such as when video is
on screen, you may also experience FIFO under-run to the LCD causing the frames
rates to drop or display image disruption. Reducing the frame rate to the slowest speed
possible gives the maximum bandwidth to the application. The display quality for an
800x600 resolution LCD is dependant on the compromises that can be made between
the LCD refresh rate and the application. The PXA255 is best suited to 320x240 and
640x480 resolution displays.
A full explanation of the graphics controller operation can be found in the PXA255 data
sheets included on the support CD.
The flat panel data and control signals are routed to PL3. See the section
343HPL3 – LCD
connector
, page 344H88, for pin assignment and part number details.
The VIPER-FPIF1 allows the user to easily wire-up a new panel using pin and crimp
style connectors. Contact Eurotech Ltd (see
51H52H345HAppendix A – Contacting Eurotech, page
346H101) for purchasing information.
A list of proven Flat Panel displays is included on the
53HVIPER product page. Click
on the Flat Panel Display Options tab for up-to-date details.
The following tables provide a cross-reference between the flat panel data signals and
their function when configured for different displays.