Intel Corporation

Elliott Garbus

Barry R Davis

An apparatus having a first interface for coupling to a first component bus; a second interface for coupling to a second component bus; an address translation unit coupled to the second interface; and a bus bridge coupled to the first interface and to the second interface. The bus bridge has a first configuration register for disabling an assertion by a first component coupled to the first interface of a component select signal on said second interface; a second configuration register for disabling a propagation by the bus bridge of a private address, contained in an address space which is private to the second interface, from the second interface to the first interface, and to disable a response by the bus bridge to the private address sent from the first interface; and a third configuration register in the address translation unit such that the address translation unit will translate the private address to a local system address in a local system address space, and also translate a local system address contained in the local system address space to the private address.

Method and apparatus for enabling intelligent I/O subsystems using PCI

A processor for creating an intelligent input/output subsystems which includes a local processor coupled to a local system bus; a local memory controller coupled to the local system bus that enables access to a memory from the local system bus; a bus bridge having a first bus interface coupled to a first component bus; a second bus interface coupled to a second component bus, the bus bridge including means for creating an address space which is private to the secondary component bus such that the bridge will not send any address found in the private address space upstream to the primary component bus; and address translation means coupled to the local system bus and the bus bridge for translating addresses between the local system bus and the second component bus. A method for creating private devices comprising the steps of configuring the bus bridge to disable the assertion by the first component of a component select signal on the second component bus; creating an address space which is private to the secondary component bus such that the bridge will not send any address found in the private address space upstream to the primary component bus; translating the private address to a local system address in a local system address space; and translating a local system address contained in the local system address space to the private address.

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Scottsdale, AZ, United States of America

Elliott Garbus