Where Are The Interrupt, Error, And Wait State Signals?
The HyperTransport specification eliminates a number of control signals that are commonly found on other buses. While devices are not prohibited from implementing signals beyond those defined in the specification, HyperTransport is a generic, simple interface and handles interrupts, errors, and data wait states in the following general way:
Interrupt Signaling
Interrupts are conveyed in HyperTransport as messages sent over the link in the posted request channel. This eliminates the need for dedicated interrupt signal traces. Depending on the architecture, it may also eliminate the need for a separate interrupt controller (e.g. IOAPIC). Refer to Chapter 8, entitled "HT Interrupts," on page ...
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