NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 126

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

Specifications of NHE6300ESB S L7XJ

• Lead Free Status / RoHS Status: Compliant

Table 47.
5.7.5.2
Table 48.
Intel
DS
126
®
6300ESB I/O Controller Hub
When the Intel
an interrupt to send over the APIC bus, it drives a start cycle to begin arbitration, by
driving bit 0 to a ‘0’ on an APICCLK rising edge. It then samples bit 1. When Bit 1 was a
zero, then a local APIC started arbitration for an EOI message on the same clock edge
that the Intel
arbitration and will stop driving the APIC bus.
When the Intel
transferring its arbitration ID, located in bits [27:24] of its Arbitration ID register
(ARBID). Starting in Cycle 2, through Cycle 5, it will tri-state bit 0, and drive bit 1 to a
‘0’ when ARBID[27] is a ‘1’. When ARBID[27] is a ‘0’, it will also tri-state bit 1. At the
end of each cycle, the Intel
bus. When the Intel
samples a ‘0’, then another APIC agent started arbitration for the APIC bus at the same
time as the Intel
will stop driving the APIC bus.
Arbitration Cycles
Bus Message Formats
After bus arbitration, the winner is granted exclusive use of the bus and will drive its
message. APIC messages come in four formats, determined by the Delivery Mode bits.
These four messages are of different length, and are known by all APICs on the bus
through the transmission of the Delivery Mode bits:
APIC Message Formats
EOI Message for Level Triggered Interrupts
EOI messages are used by local APICs to send an EOI cycle occurring for a level
triggered interrupt to an I/O APIC. This message is needed so that the I/O APIC may
differentiate between a new interrupt on the interrupt line versus the same interrupt on
the interrupt line. The target of the EOI is given by the local APIC through the
transmission of the priority vector (V7 through V0) of the interrupt. Upon receiving this
Cycle
Remote Read
Message
1
2
3
4
5
Lowest
Priority
Short
EOI
NOT (ARBID[27])
NOT (ARBID[26])
NOT (ARBID[25])
NOT (ARBID[24])
®
®
®
6300ESB ICH started arbitration. The Intel
Bit 1
Cycles
EOI
®
6300ESB ICH detects a bus idle condition on the APIC Bus, and it has
6300ESB ICH did not see an EOI message start, it will start
# of
14
21
33
39
6300ESB ICH, and it has higher priority. The Intel
®
6300ESB ICH did not drive Bit 1 (ARBID[27] = ‘0’), and it
001, 010, 100,
Mode Bits
®
Delivery
101, 111
Bit 0
6300ESB ICH will sample the state of Bit 1 on the APIC
001
011
xxx
Table 47
0
1
1
1
1
Bit 1 = 1: Normal,
Arbitration ID. When the Intel
a different value than it sent, it lost arbitration.
describes the arbitration cycles.
End of Interrupt transmission from Local APIC to I/O
APIC on Level interrupts. EOI is known by the EOI
bit at the start of arbitration
I/O APIC delivery on Fixed, NMI, SMI, Reset, ExtINT,
and Lowest Priority with focus processor messages
Transmission of Lowest Priority interrupts when the
status field indicates that the processor does not
have focus.
Message from one Local APIC to another to read
registers.
Bit 1 = 0: EOI
Comment
®
Comments
6300ESB ICH has thus lost
Order Number: 300641-004US
®
6300ESB ICH samples
Intel
®
6300ESB ICH
®
6300ESB ICH—5
November 2007