82NM10 Datasheet, PDF (198/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Functional Description
Note:
Send Byte / Receive Byte
For the Send Byte command, the Transmit Slave Address and Device Command
Registers are sent
For the Receive Byte command, the Transmit Slave Address Register is sent. The data
received is stored in the DATA0 register. Software must force the I2C_EN bit to 0 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.
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, Device Command, and Data0 Registers are sent. In addition,
the Data1 Register is sent on a Write Word command. Software must force the 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 Chipset 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 I2C_EN bit to 0 when running this command.
When programmed for the read byte/word command, the Transmit Slave Address and
Device Command Registers are sent. Data is received into the DATA0 on the read byte,
and the DAT0 and DATA1 registers on the read word. See section 5.5.5 of the System
Management Bus (SMBus) Specification, Version 2.0 for the format of the protocol.
Process Call
The process call is so named because a command sends data and waits for the slave to
return a value dependent on that data. The protocol is simply a Write Word followed by
a Read Word, but without a second command or stop condition.
When programmed for the Process Call command, Chipset transmits the Transmit Slave
Address, Host Command, DATA0 and DATA1 registers. Data received from the device is
stored in the DATA0 and DATA1 registers. The Process Call command with I2C_EN set
and the PEC_EN bit set produces undefined results. Software must force either I2C_EN
or PEC_EN to 0 when running this command. See section 5.5.6 of the System
Management Bus (SMBus) Specification, Version 2.0 for the format of the protocol.
For process call command, the value written into bit 0 of the Transmit Slave Address
Register (SMB I/O register, offset 04h) needs to be 0.
198
Datasheet