July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Assignment of IDs to the Processor
Introduction
At power-up time, each of the processors on the FSB must be assigned a unique ID that is output in any transaction initiated by the processor. This is referred to as its Agent ID. In addition, each processor contains a Local APIC module. This module must be assigned two addresses at startup time: a Cluster ID and a Local APIC ID.
The Cluster ID
The Purpose of the Cluster ID
In the Pentium® 4 processor family, interrupt messages are transferred over the FSB (the 3-wire APIC bus was eliminated). An interrupt message contains a destination address and one of the forms it can take is that of a Cluster ID and the ID of a Local APIC within a processor in the target cluster. For this reason, a Cluster ...
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