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©2008 Advanced Micro Devices, Inc.
SMBus Module and ACPI Block (Device 20, Function 0)
AMD SB600 Register Reference Manual Proprietary Page 99
Command- RW - 16 bits - [PCI_Reg: 04h]
Field Name Bits Default Description
Parity Error Response 6 0b This bit controls the device’s response to parity errors. When
the bit is set, the device must take its normal action when a
parity error is detected. When the bit is 0, the device must
ignore any parity errors that it detects and continue normal
operation.
Wait Cycle Control 7 0b This bit is used to control whether or not a device does
address/data stepping. This module does not use address
stepping. [Read-only]
SERR# Enable 8 0b This bit is an enable bit for SERR# driver. A value of 0
disables the SERR# and a value of 1 enables it.
Fast Back-to-Back
Enable
9 0b This bit indicates whether device is fast back-to-back capable.
ACPI/SMbus does not support this function and so this bit is
always 0. [Read-only]
Reserved 15:10 00h
PCI Command register
STATUS- RW - 16 bits - [PCI_Reg: 06h]
Field Name Bits Default Description
Reserved 3:0
MSI Mapping Capability 4 1/0b [Read-only] This bit indicates whether the device can support
MSI mapping. For K8 system this device is MSI mapping
capable so default value is 1; for P4 system this device does
not support MSI mapping so default value is 0.
66 MHz Capable 5 1b This bit indicates whether the device can support 66 MHz.
This device is 66 MHz capable. [Read-only]
UDF Supported 6 0b This bit indicates whether the device supports user definable
feature. This module does not support this feature and so it is
always 0. [Read-only]
Fast Back-to-Back
Capable
7 0b This bit indicates whether the device is capable of fast back-to-
back cycles. This module does not support this feature and so
it is always 0. [Read-only]
Data Parity Error
Detected
8 0b Set to 1 if the Parity Error Response bit is set, and the module
has detected PERR# asserted while acting as a PCI master
(regardless PERR# was driven by this module).
DEVSEL Timing 10:9 01b These bits encode the timing of DEVSEL#. This module will
always respond in medium timing and so these bits are always
11.
Signaled Target Abort 11 0b This bit is set by a slave device whenever it terminates a cycle
with a Target-Abort.
Received Target Abort 12 0b This bit is set by a master device whenever its transaction is
terminated with a Target-Abort.
Received Master Abort 13 0b This bit is set by a slave device whenever it terminates its
transaction with Master-Abort.
Signaled System Error 14 0b This bit is set by device whenever the device asserts SERR#.
Detected Parity Error 15 0b This bit is set by device whenever it detects a parity error,
even if parity error handling is disabled.
PCI device status register