Intel C2550 FH8065401488912 Data Sheet

Intel

Product codes

FH8065401488912

Intel

®

Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

433

Volume 2—SMBus 2.0 Unit 0 - PCU—C2000 Product Family

System Host Controller

18.3.1.5

Process Call Command

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 a Write Word followed by a Read

Word, but without a second command or stop condition.

When programmed for the Process Call command, the SoC transmits the Transmit

Slave Address (SMB_Mem_TSA), Host Command (SMB_Mem_HCMD), Data 0

(SMB_Mem_HD0) and Data 1 (SMB_Mem_HD1) registers. Data received from the

device is stored in the Data 0 (SMB_Mem_HD0) and Data 1 (SMB_Mem_HD1)

registers. The Process Call command with SMB_Config_HCFG.I2C_EN set and the

SMB_Config_HCTL.PECEN bit set produces undefined results. The software must force

either SMB_Config_HCFG.I2C_EN or SMB_Config_HCTL.PECEN and

SMB_Mem_AUXC.AAC to 0b when running this command. See Section 5.5.6 of the

System Management Bus (SMBus) Specification, Version 2.0 for the format of the

For the Process Call command, the value written into SMB_Mem_TSA.RW needs to be

Note:

If the SMB_Config_HCFG.I2C_EN bit is set, the protocol sequence changes slightly: the

command code (bits [18:11] in the bit sequence) is not sent, and as a result, the slave

does not acknowledge (bit 19 in the sequence).