82801FB Datasheet, PDF (573/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

SMBus Controller Registers (D31:F3)
15.2.3
15.2.4
15.2.5
15.2.6
HST_CMD—Host Command Register (SMBus—D31:F3)
Register Offset: SMBASE + 03h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
Bit
Description
7:0
This 8-bit field is transmitted by the host controller in the command field of the SMBus protocol
during the execution of any command.
XMIT_SLVA—Transmit Slave Address Register
(SMBus—D31:F3)
Register Offset: SMBASE + 04h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
This register is transmitted by the host controller in the slave address field of the SMBus protocol.
Bit
Description
7:1 Address — R/W. This field provides a 7-bit address of the targeted slave.
RW — R/W. Direction of the host transfer.
0 _{0 = Write}
1 = Read
HST_D0—Host Data 0 Register (SMBus—D31:F3)
Register Offset: SMBASE + 05h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
Bit
Description
Data0/Count — R/W. This field contains the 8-bit data sent in the DATA0 field of the SMBus
protocol. For block write commands, this register reflects the number of bytes to transfer. This
7:0 register should be programmed to a value between 1 and 32 for block counts. A count of 0 or a
count above 32 will result in unpredictable behavior. The host controller does not check or log illegal
block counts.
HST_D1—Host Data 1 Register (SMBus—D31:F3)
Register Offset: SMBASE + 06h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
Bit
Description
7:0
Data1 — R/W. This 8-bit register is transmitted in the DATA1 field of the SMBus protocol during the
execution of any command.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
573