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21555 PCI-to-PCI Bridge Evaluation Board User’s Guide 5
Introduction 1
This User’s Guide describes the 21555 PCI-to-PCI nontransparent Bridge Evaluation Board which
is referred to as the DE1B55503.
1.1 Overview
The DE1B55503 is a PCI expansion board that is used to evaluate the operation of the 21555 when
it is used as a gateway to an intelligent subsystem. The subsystem can use a variety of PCI devices
and local processors. The DE1B55503 can be used to:
• Develop initialization code to configure the 21555 and associated logic and devices on the
local PCI bus as an intelligent controller.
• Evaluate the operation of the 21555 with a variety of PCI devices configured in an intelligent
subsystem.
• Build and evaluate a system using synchronous and asynchronous clocking.
• Test features:
— Intelligent Input/Output (I2O) transactions.
— Power management features.
— Vital Product Data (VPD) support.
1.2 Features
The DE1B55503:
• Complies fully with the protocol and electrical standards of the PCI Local Bus Specification,
Revision 2.3.
• Includes a 21555 “nontransparent” PCI-to-PCI Bridge that provides bridging between two
processor domains.
• Includes a host PCI interface that plugs into any 5V PCI option card slot.
• Provides three local bus 5V PCI bus option card slots. Slot 1 (see Figure 1 on page 6) may be
used as a local processor or system slot.
• Includes support, products, and documentation.