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©2008 Advanced Micro Devices, Inc.
LPC ISA Bridge (Device 20, Function 3)
AMD SB600 Register Reference Manual Proprietary Page 258
Miscellaneous Control Bits- RW - 8 bits - [PCI_Reg: 78h]
Field Name Bits Default Description
Msi On 1 0b When this bit is set to 1, it turns on LPC MSI capability. The
following will be true:
* Reg0x04[20] (capabilities list) reads 1.
* Reg0x34[7:0] (capabilities pointer) reads 80h
When this bit is set to 0, it turns off lpc MSI capability. The
following will be true:
* Reg0x04[20] reads 0.
* Reg0x34[7:0] reads 0.
Reserved 31:2 0000_0000h
TPM (trusted plant form module) register- RW - 32 bits - [PCI_Reg: 7Ch]
Field Name Bits Default Description
Tpm12_en 0 0b When set to 1, it enables decoding of tpm (trusted platform
module) cycles defined in TPM1.2 spec (Refer to the
addresses defined in bit[1] below). Note that tpm12_en and
tpm_legacy are independent bits; they respectively turn on
decoding of different tpm addresses.
Tpm_amd 1 0b This bit is replaced with strap pin K8system (to support AMD
K8 CPU), and no longer in use. It is read only and returns 0.
When the strap is 0, it ONLY supports these normal tpm
cycles. Here are the cycle definition. (Left hand side is
system/software memory address, which is translated to LPC
IO address on the right hand side.)
0xFED4_0xxx --> 0x0xxx
0xFED4_1xxx --> 0x1xxx
0xFED4_2xxx --> 0x2xxx
0xFED4_3xxx --> 0x3xxx
0xFED4_4xxx --> 0x4xxx
When the strap is 1, it ONLY supports these AMD tpm
cycles.
0xFED4_0xxx --> 0x0xxx
0xFED4_1xxx --> 0x1xxx
0xFED4_2xxx --> 0x2xxx
0xFED4_3xxx --> 0x3xxx
0xFD_F920_0000~0xFD_F923_FFFF --> 0x4028
0xFD_F928_0000~0xFD_F928_0003 --> 0x4020
0xFD_F928_0004~0xFD_F928_0007 -->
0x4024~0x4027
Tpm_legacy 2 0b When set to 1, it enables decoding of legacy tpm addresses,
i.e., IO addresses 7E/7F and EE/EF will be decoded.
Tmkbc_enable 3 0b Enable bit for the TMKBC function
Tmkbc_set 4 0b Write once bit. Once set, all tmkbc address/remap registers
cannot be changed until the next reset.
Tmkbc_sel 6:5 0h There are actually four sets of TMKBC mapping registers.
These two bits select which one of four sets of tmkbc
registers at 84, 88, and 8Ch to be accessed.
Reserved 31:7 0000000h
Note: Any tpm cycle above is decoded only when the cycle is started by ALinkBridge. Access from bus master
devices is not allowed.
MSI Capability Register- R - 32 bits - [PCI_Reg: 80h]
Field Name Bits Default Description
CAP ID 7:0 08h CAP ID.
CAP Next Pointer 15:8 00h CAP Next Pointer.
CAP Enable 16 1b CAP Enable.