User Guide CC8-BLUES • Multi-Processing
CompactPCI
CPU
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EKF Elektronik GmbH • Philipp-Reis-Str. 4 • 59065 HAMM • Germany
Tel. +49 (0)2381/6890-0 • Fax. +49 (0)2381/6890-90 • E-Mail [email protected] • Internet http://www.ekf.de
flat addressing model across PCI-to-PCI bridges. This means that a given physical address exists
at only one location in the PCI bus hierarchy and that this location may be accessed by any
device attached at any point in the PCI bus hierarchy. As a consequence, it is not possible for a
PPB to isolate devices or address ranges from access by devices on the opposite interface of a
PPB. The PPB architecture assumes that the resources of any device in a PCI system are
configured and managed by the host processor.
Since the 21555 is not transparent, the device driver for the CC8-BLUES must be aware of the
presence of the 21555 and manage its resources appropriately. The 21555 allows the entire
subsystem to appear as a single virtual device to the host. This enables configuration software
to identify the appropriate driver for the subsystem.