VT82C686B
Memory Mapped I/O APIC Registers
Indexed I/O APIC 32-Bit Registers
Offset 0 – APIC Identification (0000 0000h) .................. RW
Memory Address FEC00000 – APIC Index....................RW
.......................................... default = 00h
........................................always reads 0
7-0 APIC Index
31-28 Reserved
8-bit pointer to APIC registers.
..................................default = 0
27-24 APIC Identification
Software must program this value before using the
APIC.
Memory Address FEC00013-10 – APIC 32-bit Data .....RW
.................... default = 0000 0000h
31-0 APIC 32-bit Data
........................................always reads 0
23-0 Reserved
Data for the APIC register pointed to by the APIC
index
Offset 1 – APIC Version (0017 0011h)............................. RO
....................................always reads 00h
31-24 Reserved
Memory Address FEC00020 – APIC IRQ Pin AssertionWO
...................always reads 17h
23-16 Maximum Redirection
........................................ always reads 0
7-5 Reserved
Equal to the number of APIC interrupt pins minus
one. For this APIC, this value is 17h (23 decimal).
........................default undefined
4-0 APIC IRQ Number
IRQ # for this interrupt. Valid values are 0-23 only.
....................................always reads 00h
15-8 Reserved
..................................always reads 11h
The implementation version for this APIC is 11h.
7-0 APIC Version
Memory Address FEC00040 – APIC EOI ..................... WO
................default undefined
7-0 Redirection Entry Clear
When a write is issued to this register, the APIC will
check this field and compare it with the vector field
for each entry in the I/O redirection table. When a
match is found, the “Remote_IRR” bit for that I/O
Redirection Entry will be cleared.
Offset 2 – APIC Arbitration (0000 0000h) ...................... RO
....................................always reads 00h
31-28 Reserved
......................always reads 00h
27-24 APIC Arbitration ID
....................................always reads 00h
23-0 Reserved
Revision 1.71 June 9, 2000
-115- Function 5 & 6 Registers - AC97 Audio & Modem Codecs
ETC [ ETC ]
