Intel E3815 FH8065301567411 Data Sheet
Product codes
FH8065301567411
PCU – System Management Bus (SMBus)
Intel
®
Atom™ Processor E3800 Product Family
Datasheet
4431
acknowledge, and the transaction times out, the SMB_Mem_HSTS.DEVERR bit is set. If
software sets the SMB_Mem_HCTL.KILL bit while the command is running, the
transaction will stop and the SMB_Mem_HSTS.FAILED bit will be set.
software sets the SMB_Mem_HCTL.KILL bit while the command is running, the
transaction will stop and the SMB_Mem_HSTS.FAILED bit will be set.
Quick Command
When programmed for a Quick Command, the Transmit Slave Address
(SMB_Mem_TSA) register is sent. The PEC byte is never appended to the Quick
Protocol. Software should force the SMB_Config_HCTL.PECEN bit to 0b when
performing the Quick Command. Software must force the SMB_Config_HCFG.I2C_EN
bit to 0b when running this command. See section 5.5.1 of the System Management
Bus (SMBus) Specification, Version 2.0 for the format of the protocol.
(SMB_Mem_TSA) register is sent. The PEC byte is never appended to the Quick
Protocol. Software should force the SMB_Config_HCTL.PECEN bit to 0b when
performing the Quick Command. Software must force the SMB_Config_HCFG.I2C_EN
bit to 0b when running this command. See section 5.5.1 of the System Management
Bus (SMBus) Specification, Version 2.0 for the format of the protocol.
Send Byte / Receive Byte
For the Send Byte command, the Transmit Slave Address (SMB_Mem_TSA) and Host
Command (SMB_Mem_HCMD) registers are sent. For the Receive Byte command, the
Transmit Slave Address (SMB_Mem_TSA) register is sent. The data received is stored in
the Data 0 (SMB_Mem_HD0) register. Software must force the
SMB_Config_HCFG.I2C_EN bit to 0b when running this command.
Command (SMB_Mem_HCMD) registers are sent. For the Receive Byte command, the
Transmit Slave Address (SMB_Mem_TSA) register is sent. The data received is stored in
the Data 0 (SMB_Mem_HD0) register. Software must force the
SMB_Config_HCFG.I2C_EN bit to 0b when running this command.
The Receive Byte is similar to a Send Byte, the only difference is the direction of data
transfer. See sections 5.5.2 and 5.5.3 of the System Management Bus (SMBus)
Specification, Version 2.0 for the format of the protocol.
transfer. See sections 5.5.2 and 5.5.3 of the System Management Bus (SMBus)
Specification, Version 2.0 for the format of the protocol.
Write Byte/Word
The first byte of a Write Byte/Word access is the command code. The next 1 or 2 bytes
are the data to be written. When programmed for a Write Byte/Word command, the
Transmit Slave Address (SMB_Mem_TSA), Host Command (SMB_Mem_HCMD), and
Data 0 (SMB_Mem_HD0) registers are sent. In addition, the Data 1 (SMB_Mem_HD1)
register is sent on a Write Word command. Software must force the
SMB_Config_HCFG.I2C_EN bit to 0 when running this command. See section 5.5.4 of
the System Management Bus (SMBus) Specification, Version 2.0 for the format of the
protocol.
are the data to be written. When programmed for a Write Byte/Word command, the
Transmit Slave Address (SMB_Mem_TSA), Host Command (SMB_Mem_HCMD), and
Data 0 (SMB_Mem_HD0) registers are sent. In addition, the Data 1 (SMB_Mem_HD1)
register is sent on a Write Word command. Software must force the
SMB_Config_HCFG.I2C_EN bit to 0 when running this command. See section 5.5.4 of
the System Management Bus (SMBus) Specification, Version 2.0 for the format of the
protocol.
Read Byte/Word
Reading data is slightly more complicated than writing data. First the SoC must write a
command to the slave device. Then it must follow that command with a repeated start
condition to denote a read from that device's address. The slave then returns 1 or 2
bytes of data. Software must force the SMB_Config_HCFG.I2C_EN bit to 0b when
running this command.
command to the slave device. Then it must follow that command with a repeated start
condition to denote a read from that device's address. The slave then returns 1 or 2
bytes of data. Software must force the SMB_Config_HCFG.I2C_EN bit to 0b when
running this command.
When programmed for the read byte/word command, the Transmit Slave Address
(SMB_Mem_TSA) and Host Command (SMB_Mem_HCMD) registers are sent. Data is
received into the Data 0 (SMB_Mem_HD0) on the read byte, and the Data 0
(SMB_Mem_TSA) and Host Command (SMB_Mem_HCMD) registers are sent. Data is
received into the Data 0 (SMB_Mem_HD0) on the read byte, and the Data 0