Intel IA-32 User Manual
Page 331
Vol. 3A 8-7
ADVANCED PROGRAMMABLE INTERRUPT CONTROLLER (APIC)
Figure 8-4. Local APIC Structure
Current Count
Register
Initial Count
Register
Divide Configuration
Register
Version Register
Error Status
Register
In-Service Register (ISR)
Vector
Decode
Interrupt Command
Register (ICR)
Acceptance
Logic
Vec[3:0]
& TMR Bit
Register
Select
INIT
NMI
SMI
Protocol
Translation Logic
Dest. Mode
& Vector
Processor System Bus
3
APIC ID
Register
Logical Destination
Register
Destination Format
Register
Timer
Local
Interrupts 0,1
Performance
Monitoring Counters
1
Error
Timer
Local Vector Table
DATA/ADDR
Prioritizer
Task Priority Register
EOI Register
INTR
EXTINT
INTA
LINT0/1
1. Introduced in P6 family processors.
Thermal Sensor
2
2. Introduced in the Pentium 4 and Intel Xeon processors.
Perf. Mon.
Thermal
(Internal
Interrupt)
Sensor
(Internal
Interrupt)
Spurious Vector
Register
Local
Interrupts
3. Three-wire APIC bus in P6 family and Pentium processors.
To
CPU
Core
From
CPU
Core
Interrupt Request Register (IRR)
Trigger Mode Register (TMR)
To
CPU
Core
Processor Priority
Register
4. Not implemented in Pentium 4 and Intel Xeon processors.
Arb. ID
Register
4