Chapter 20. I/O Compatibility

The Previous Chapter

The previous chapter summarized some of the major additions to the HyperTransport protocol which will be forthcoming in Release 1.05 and Release 1.1 of the specification. Collectively, these additions are referred the HyperTransport Networking Extensions, and target some of the special requirements of communications processing. Key features include a message passing protocol for larger packets, a formal definition for switch devices, a link-level error recovery method, sixteen optional additional posted write virtual channels with defined arbitration and bandwidth allocation, direct peer-peer transfers, an increase in the number of outstanding transactions for host bridges, and a 64-bit addressing ...

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