User manual

Detailed hardware description
Issue E 21
The design supports 520MHz, 416MHz and 312MHz speed variants of the PXA270
processor. The standard variant of the ZEUS board is fitted with the 520MHz version of
PXA270. The maximum speed available for extended temperature versions of the ZEUS
is 416MHz.
A 13MHz external crystal is used to run the PXA270 processor. All other clocks are
generated internally in the processor.
The PXA270 processor family provides multimedia performance, low power capabilities
and rich peripheral integration. Designed for wireless clients, it incorporates the latest
Intel advances in mobile technology over its predecessor, the PXA255 processor. The
PXA270 processor features scalability by operating from 104MHz up to 520MHz,
providing enough performance for the most demanding control and monitoring
applications.
PXA270 is the first Intel Personal Internet Client Architecture (PCA) processor to include
Intel Wireless MMX technology, enabling high performance, low power multimedia
acceleration with a general-purpose instruction set. Intel Quick Capture technology
provides a flexible and powerful camera interface for capturing digital images and video.
Power consumption is also a critical component. Wireless Intel SpeedStep technology
provides the new capabilities in low power operation.
The processor requires a number of power supply rails. All voltage levels are generated
on-board from either the DC/DC PSU or from the single +5V power input. The ZEUS
uses a specialized Power Management IC to support Intel SpeedStep technology.
The PXA270 processor is a low power device and does not require a heat sink for
operating temperatures up to 85°C (185°F).