Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
SMB_DATA[0]:
SMB_DATA[1]:
SMB_PRTCL:
Low data byte to be sent.
High data byte to be sent.
Write 0x0C to initiate the process call protocol, or 0x8C to initiate the process call
protocol with PEC.
Data Returned:
SMB_DATA[0]:
SMB_DATA[1]:
SMB_STS:
SMB_PRTCL:
Low data byte received.
High data byte received.
Status code for transaction.
0x00 to indicate command completion.
12.9.2.12 Block Write-Block Read Process Call
Data Sent:
SMB_ADDR: Address of SMBus device.
SMB_CMD:
Command byte to be sent.
SMB_DATA[0-31]: Data bytes to write (1-31).
SMB_BCNT: Number of data bytes (1-31) to be sent.
SMB_PRTCL: Write 0x0D to initiate the write block-read block process call protocol, or 0x8D to
initiate the write block-read block process call protocol with PEC.
Data Returned:
SMB_BCNT: Number of data bytes (1-31) received.
SMB_DATA[0-31]: Data bytes received (1-31).
SMB_STS:
Status code for transaction.
SMB_PRTCL: 0x00 to indicate command completion.
Note: The following restrictions apply: The aggregate data length of the write and read blocks must not
exceed 32 bytes and each block (write and read) must contain at least 1 byte of data.
12.9.2.13 SMBus Register Set
The register set for the SMB-HC has the following format. All registers are 8 bit.
Table 12-299 SMB EC Interface
Location Register Name Description
BASE+0 SMB_PRTCL Protocol register
BASE+1 SMB_STS Status register
BASE+2 SMB_ADDR Address register
BASE+3 SMB_CMD Command register
BASE+4 SMB_DATA[0] Data register zero
654 April, 2015 Version 6.0