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 ...

Get HyperTransport™ System Architecture now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial