
Coppertail Product Specification
MT8LLN22NCNE.fm – Rev. 1, Pub. 2/02
113
2002, Micron Technology Inc.
PRELIMINARY
MT8LLN22NCNE
COPPERTAIL
SMB Protocol Register
SMB Implementation Status
ADDRESS: SMB_BASE + 00h
SYMBOL: SMB_PROTO
BITS
DESCRIPTION
PROPERTIES
RESET
7Reserved
R/W
0
6
Transfer Start Bit. This bit needs to be set after all the transfer registers
are setup. This bit initiates the SMB bus transfer, when set.
R/W
0
5-2
SMB Protocol. Please refer to the ACPI or SMB specification for a detailed
description of protocols.
0001 Reserved
0010 WRITE QUICK Command
0011 READ QUICK Command
0100 SEND BYTE Command
0101 RECEIVE BYTE Command
0110 WRITE BYTE Command
0111 READ BYTE Command
1000 WRITE WORD Command
1001 READ WORD Command
1010 WRITE BLOCK Command
1011 READ BLOCK Command
1100 PROCESS CALL Command
R/W
0
1
Kill Bit. This bit can be used to kill the Last Transfer when set. This should
be done as a last resort. The SMB bus has plenty of timeouts to end
transfers.
R/W
0
SMB Interrupt Enable. Enabled when set.
R/W
0
ADDRESS: SMB_BASE + 01h
SYMBOL: SMB_IS_STS
BITS
DESCRIPTION
PROPERTIES
RESET
7
SMB Transfer Done Status Bit. When set, the SMB transfer is complete.
R/WOTC
0
6
SMB Alert Status Bit. When set, indicates that ALERT has been sampled
active by the SMB controller. ALERT is normally used to allow non-bus
mastering SMB devices to signal that they need to be accessed.
R/WOTC
0
5
Host Busy Error Status Bit. When set, this bit indicates that a SMB transfer
was started when another transfer on the SMB bus was ongoing.
R/WOTC
0
4
Failed Status Bit. This bit is set in response to the Kill Bit being set in SMB
Register 00h.
R/WOTC
0
3
Arbitration Lost Status Bit. When set, the SMB Core lost arbitration of
the SMB bus to another SMB Bus Master.
R/WOTC
0
2
Device Error Status Bit. Refer to SMB I/O register 2Ch for ACPI specified
status.
R/WOTC
0
1
SMB Core Interrupt Status Bit. When set, the SMB Core has sent an inter-
rupt to the system.
R/WOTC
0
HOST BUSY Status Bit. When set, the SMB Controller is busy with a trans-
fer on the SMB bus.
R/WOTC
0