User manual

ZEUS user manual
Issue E
40
Unsupported PC/104 interface features
The ZEUS does not support the following PC/104 bus features:
• PC/104 IRQ9, IRQ14 and IRQ15 are not available.
• DMA is not supported. Therefore, AEN signal is set to a constant logical zero.
• Bus mastering is not supported. Therefore, do not connect any other master add-on
board to the ZEUS PC/104 interface.
• Shared interrupts are not supported. Do not connect more than one add-on board to
the same interrupt signal line.
• BALE signal is set to a constant logical one as the address is valid over the entire
bus cycle. Add-on PC/104 boards that implement transparent latch on address lines
LA17-LA23 are compatible with the ZEUS implementation of BALE.
• The PXA270 PCMCIA memory controller does not support 8-bit memory read
accesses for common memory space.
• The PXA270 PCMCIA memory controller does not support PC/104 MEMCS#
signalling, so there is no support for dynamic bus sizing.
Flat panel display
The PXA270 processor contains an integrated LCD display controller. It is capable of
supporting both colour and monochrome single- and dual-scan display modules. It
supports active (TFT) and passive (STN) LCD displays up to 800x600 pixels.
The PXA270 can drive displays with a resolution up to 800x600, but as the PXA270 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-runs causing the frame 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 PXA270 is optimized for a 640x480 display resolution.
A full explanation of the graphics controller operation can be found in the Intel PXA27x
Processor Family Developer’s Manual included on the Development Kit CD.
The ZEUS-FPIF
interface board allows the user to easily wire-up a panel using pin and
crimp style connectors (see page 114
). Contact Eurotech Sales (see page 125) for
purchasing information. Alternatively, the display interface is connected to an LVDS
interface (see the section LVDS interface
, page 44). This may be useful when driving
displays located more than 300mm (12") from the ZEUS.
The following tables provide a cross-reference between the flat panel data signals and
their function when configured for different displays.