
138
Registers
Chapter 4
AMD-8111 HyperTransport I/O Hub Data Sheet
24674
Rev. 3.00
April 2003
AMD Preliminary Information
The following are register behaviors found in the register descriptions.
Table 46.
Register Behavior Types (Read, Write, Etc.)
4.1.3
Positively- and Subtractively-Decoded Spaces
The IC positively decodes all address ranges described above as well as address windows for the
secondary PCI bus, specified by the PCI bridge header. All transactions received that are not
positively decoded are passed either directly to the LPC bridge or provided onto the secondary PCI
Table 45.
Relocatable Address Spaces
AddressSpecifiedBy
Configuration
Register
DevB:0x74
DevB:0xA0
DevB:0xA8
DevB:1x10
1
DevB:1x14
1
DevB:1x18
1
DevB:1x1C
1
DevB:1x20
DevB:2x10
DevB:3x58
DevB:5x10
DevB:5x14
DevB:6x10
DevB:6x14
Dev0:0x10
Dev0:1x10
Dev0:2x10
Dev0:2x14
Dev1:0x10
Notes:
1. DevB:1x10, DevB:1x14, DevB:1x18, and DevB:1x1C are only used when the IDE controller is in native mode as
specified by DevB:1x08.
Size
(Bytes)
Type
Mnemonic Function
256
1024
32
8
4
8
4
16
32
256
256
64
256
64
4K
4K
256
256
4K
I/O mapped
Memory mapped
Memory mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
I/O mapped
Memory mapped
Memory mapped
Memory mapped
Memory mapped
Memory mapped
None
HPETxx
WDTxx
None
None
None
None
IBMx
SCxx
PMxx
None
ACxx
None
MCxx
None
None
ECAP
DBG
ENC
Pointer to 256 bytes of non volatile RAM
High Precision Event Timer control registers
Watchdog Timer control registers
Pointer to primary port IDE command space
Pointer to primary port IDE control space
Pointer to secondary port IDE command space
Pointer to secondary port IDE control space
IDE controller bus-master control registers
SMBus controller command register space
System management I/O register space
Pointer to AC
‘
97 audio mixer space
AC
‘
97 audio bus master control registers
Pointer to AC
‘
97 modem mixer space
AC
‘
97 modem bus master control registers
USB OHC control registers
USB OHC control registers
USB EHC capability registers
USB EHC debug port registers
Ethernet controller memory space
Type
Read or read-only
Description
Capable of being read by software. Read-only implies that the register cannot be
written to by software.
Capable of being written by software.
Register bit is set High by hardware.
Software must write a 1b to the bit in order to clear it. Writing a 0b to these bits has no
effect.
Software can set the bit High by writing a 1b to it. However subsequent writes of 0b
have no effect. RESET_L must be asserted in order to clear the bit.
After RESET_L, these registers may be written to once. After they are written, they
become read-only until the next RESET_L assertion.
Write
Set by hardware
Write 1 to clear
Write 1 only
Write once