Chapter 10. Error Detection And Handling


The Previous Chapter

Rather than requiring HT devices to incorporate additional pins for signaling system- related items such as power management events, System Management messages are defined that permit signaling via transactions, thereby creating virtual wires. The previous chapter defined the mechanism used to send these messages, by detailing the System Management packets and protocol. Some System Management functions such as changing the operating frequency of an HT link require that transactions be stopped . This chapter also introduced the ability to temporarily disconnect the links to allow these types of state change and to save power.

This Chapter

As indicated in the chapter title, there are two aspects in dealing with link or internal errors in HyperTransport: detection and handling. This chapter describes the error types defined by the specification and what devices may do about them. Some devices may choose to detect and handle some errors and not others. The PCI configuration space registers used to program the error strategy and log errors are described here, as are the reporting mechanisms: error response, fatal and non-fatal interrupts, and Sync flood.

The Next Chapter

Reset signalling and timing along with actions taken by the system and devices during reset are the primary topics discussed in the next chapter. It also discusses the software initiated reset and why it's required. The process of determining the default speed and link width and the subsequent software tuning of bus speed and link width are also detailed.



HyperTransport System Architecture
HyperTransportв„ў System Architecture
ISBN: 0321168453
EAN: 2147483647
Year: 2003
Pages: 182

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