Introduction
PC compatibility remains important in many operating environments and may include the use of several legacy buses. HT is intended to support connections to a variety of I/O buses, and the specification gives special attention to the PC legacy buses to ensure compatible support.
Several areas must be considered to ensure compatibility with I/O buses, including:
Protocol differences
Ordering requirements
Command translation
Address space and range differences
Potential deadlocks
The buses currently supported and discussed by the HT specification include PCI, PCI-X, AGP, and host processor buses, with special attention given to issues associated with PC legacy support via the ISA/LPC buses.
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