How Does The Bridge Manage It All?
HyperTransport bridges make use of the same HyperTransport Host/Primary and Slave/Secondary advanced capability blocks already defined for non-bridge devices. Non-bridge HyperTransport device configuration is described in Chapter 13, entitled "Device Configuration," on page 305. Second, they implement the type 1 configuration space header common to all PCI-compatible bridges (with the redefinition of certain bits described shortly). This is fortunate because:
HyperTransport bridges maintain software compatibility with PCI bridges.
Bridge headers already contain two sets of control/status registers for managing two independent interfaces, making support for mixed HyperTransport and PCI/PCI-X bridges a reasonable ...
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