NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 125

• Manufacturer Part Number: NHE6300ESB S L7XJ
• Manufacturer: Intel

Specifications of NHE6300ESB S L7XJ

• Lead Free Status / RoHS Status: Compliant

5—Intel
Table 46.
5.7.5.1
November 2007
Order Number: 300641-004US
®
6300ESB ICH
APIC Interrupt Mapping, APIC1 Agent
APIC Bus Arbitration
The I/O APIC uses one wire arbitration to win bus ownership. A rotating priority scheme
is used for APIC bus arbitration. The winner of the arbitration becomes the lowest
priority agent and assumes an arbitration ID of zero. All other agents, except the agent
whose arbitration ID is 15, increment their Arbitration IDs by one. The agent whose ID
was 15 will take the winner's arbitration ID and will increment it by one. Arbitration IDs
are changed only for messages that are transmitted successfully (except for the Low
Priority messages). A message is transmitted successfully when no CS error or
acceptance error was reported for that message.
An APIC agent may use two different priority schemes: Normal or EOI. EOI has the
highest priority. EOI priority is used to send EOI messages for level interrupts from a
local APIC to an I/O APIC. When an agent requests the bus with EOI priority, all other
agents requesting the bus with normal priorities will back off.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
IRQ #
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Via SERIRQ
PXIRQ0
PXIRQ1
PXIRQ2
PXIRQ3
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Direct from
Pin
Supported by APIC1 agent
APIC Mode
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
From PCI
Message
WDT
Intel
Internal Modules
®
6300ESB I/O Controller Hub
125
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