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©2008 Advanced Micro Devices, Inc.
LPC ISA Bridge (Device 20, Function 3)
AMD SB600 Register Reference Manual Proprietary Page 251
CMD- RW - 16 bits - [PCI_Reg: 04h]
Field Name Bits Default Description
SERR# Enable 8 0b SERR# enable - If set to 1, the LPC bridge asserts SERR#
when it detects as address parity error. SERR# is not
asserted if this bit is 0.
Fast Back-tp-Back Enable 9 0b Hardcoded to 0 to indicate that Fast Back-to-back is
disabled. The LPC bridge only acts as a master to a single
device, so this functionality is not needed.
Reserved 15:10 00h
Command Register: The PCI specification defines this register to control a PCI device’s ability to generate and
respond to PCI cycles.
STATUS- RW - 16 bits - [PCI_Reg: 06h]
Field Name Bits Default Description
Reserved 3:0 0h
Capabilities List 4 0b This bit is read only. When reg0x78[1] is 1, this bit reads 1; when
reg0x78[1] is 0, this bit reads 0. This is to satisfy K8
requirement. For P4 system, 0x78[1] should be set to 0 to mask
off this bit.
Reserved 7:5 0h
Master Data Parity
Error
8 0h Data Parity reported – Set to 1 if the LPC bridge detects PERR#
asserted while acting as PCI master (whether PERR# was driven
by the LPC bridge or not.)
Device Select Timing 10:9 1h DEVSEL# timing – Read only bits indicating DEVSEL# timing
when performing a positive decode.
Since DEVSEL# is asserted to meet the medium timing, these
bits are encoded as 01b.
Signaled Target Abort 11 0b Signaled Target Abort – This bit is set to 1 when the LPC bridge
signals Target Abort.
Received Target Abort 12 0b Received Target Abort – This bit is set to 1 when the LPC bridge
-generated PCI cycle is aborted by a PCI target. Cleared by
writing a 1 to it.
Received Master Abort 13 0b Received Master Abort Status. Set to 1 when the LPC bridge
acts as a PCI master and aborts a PCI bus cycle. Cleared by
writing a 1 to this bit.
Signaled System Error 14 0b SERR# status. This bit is set to 1, when the LPC bridge detects
a system error.
Detected Parity Error 15 0b Detected Parity Error. This bit is set to 1 when the LPC bridge
detects a parity error.
Status Register: The PCI specification defines this register to record status information for PCI related events.
Writing 0 to a bit has no effect; writing 1 to a bit will clear it to 0.
Revision ID/Class Code - R - 8 bits - [PCI_Reg: 08h]
Field Name Bits Default Description
Revision ID
7:0 00h These bits are hardwired to 00h to indicate the revision level of
the chip design
Class Code 31:8 060100h Class Code.
Revision ID/Class Code Register: This read only register contains the device’s revision information and generic
function. Since SB600 is an ISA bridge, its assigned class code is 060100h.
Cache Line Size - R - 8 bits - [PCI_Reg: 0Ch]
Field Name Bits Default Description
Cache Line Size 7:0 00h Cache Line Size.
Cache Line Size Register: This register specifies the system cache line size. This register is not implemented.