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Intel® 460GX Chipset Software Developer’s Manual 14-11
SM Bus Controller Configuration
14.3.9.1 10.3.10.smbshdwcmd–SMBus Shadow Command Register (I/O)
I/O Address: Base + (09h)
Default Value: 00h
Attribute: Read only
This register is used to store command values for external SMBus master accesses to the host slave
and slave shadow ports.
14.3.9.2 10.3.11.smbslvevt–SMBus Slave Event Register (I/O)
I/O Address: Base + (0Ah)
Default Value: 0000h
Attribute: Read/Write
This register is used to enable generation of interrupt or resume events for accesses to the host
controller’s slave port.
14.3.10 smbslvdat–SMBus Slave Data Register (I/O)
I/O Address: Base + (0Ch)
Default Value: 0000h
Attribute: Read only
This register is used to store data values for external SMBus master accesses to the shadow ports or
the SMBus host controller’s slave port.
0 Slave Enable (SLV_EN)–R/W. 1 = Enable the generation of an interrupt or resume event upon
an external SMBus master generating a transaction with an address that matches the host
controller slave port of 10h, a command field which matches the SMBSLVC register, and a
match of one of the corresponding enabled events in the SMBSLVEVT register. 0 = Disable.
Bit Description
Bit Description
7:0 Shadow Command (SHDW_CMD)–RO. This field contains the command value which was
received during an external SMBus master access whose address field matched the host slave
address (10h) or one of the slave shadow port addresses.
Bit Description
15:0 SM BUS Slave Event (SMB_SLV_EVT)–R/W. This field contains data bits used to compare
against incoming data to the SMBSLVDAT register. When a bit in this register is a 1 and the
corresponding bit in the SMBSLVDAT register is set, then an interrupt or resume event will be
generated if the command value matches the value in the SMBSLVC register and the access
was to SMBus host address 10h.
Bit Description
15:0 SLAVE DATA (SMB_SLV_DATA)–RO. This field contains the data value which was transmitted
during an external SMBus master access whose address field matched one of the slave shadow
port addresses or the SMBus host controller slave port address of 10h.