February 2003
Intermediate to advanced
592 pages
11h 47m
English
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Interrupt Requests
Interrupt request messages originate within HT I/O devices and are sent upstream using the posted-write virtual channel. This assures that any posted write transactions that preceded the interrupt request are pushed ahead of it to memory before the host bridge receives the interrupt.
HT uses message-signaled interrupts that behave much like HT Sized Write (byte) transactions. The interrupt request packet format is defined, but how bit fields are used is implementation-specific
While interrupt information contained in a request varies with the implementation, basic content might include:
Type of interrupt
Target address or CPU ID of the recipient
Interrupting device's vector
Whether an End-Of- Interrupt (EOI) acknowledgement is ...
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