Intel C2550 FH8065401488912 Data Sheet
Product codes
FH8065401488912
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
565
Volume 2—I/O Advanced APIC (I/O APIC)—C2000 Product Family
Architectural Overview
30.3.3.3
Redirection Table Entry (RTE[23:0]) Registers
All 24 of the 64-bit Redirection Table Entry (RTE) Registers have the same format which
is shown below. Each 64-bit register is accessed as two, 32-bit register accesses
starting at offsets 10-11h (RTE[0]). The RTE[23] register is accessed at offsets 3E-3Fh.
Table 30-5. Redirection Table Entry (RTE[23:0]) Registers
Bits
Type
Reset
Description
63:56
RW
X
Destination ID (DID):
Destination ID of the local APIC.
55:48
RW
X
Extended Destination ID (EDID):
Extended destination ID of the local APIC.
47:17
RO
0
Reserved
16
RW
1
Mask (MSK):
When set, interrupts are not delivered nor held pending. When
cleared, and edge or level on this interrupt results in the delivery of the interrupt.
15
RW
X
Trigger Mode (TM):
When cleared, the interrupt is edge sensitive. When set, the
interrupt is level sensitive.
14
RW
X
Remote IRR (RIRR):
This is used for level triggered interrupts its meaning is
undefined for edge triggered interrupts. This bit is set when IOxAPIC sends the
level interrupt message to the CPU. This bit is cleared when an EOI message is
received that matches the VCT field. This bit is never set for SMI, NMI, INIT, or
ExtINT delivery modes.
13
RW
X
Polarity (POL):
This specifies the polarity of each interrupt input. When cleared,
the signal is active high. When set, the signal is active low.
12
RO
X
Delivery Status (DS):
This field contains the current status of the delivery of this
interrupt. When set, an interrupt is pending and not yet delivered. When cleared,
there is no activity for this entry.
11
RW
X
Destination Mode (DSM):
This field is used by the local APIC to determine
whether it is the destination of the message.
10:8
RW
X
Delivery Mode (DLM):
This field specifies how the APICs listed in the destination
field should act upon reception of this signal. Certain Delivery Modes only operate
as intended when used in conjunction with a specific trigger mode. The encoding is:
000 Fixed
000 Fixed
001 Lowest Priority
010 SMI – Not supported
011 Reserved
100 NMI – Not supported
101 INIT – Not supported
110 Reserved
111 ExtINT
7:0
RW
X
Vector (VCT):
This field contains the interrupt vector for this interrupt. Values
range between 10h and FEh.