Intel E3845 FH8065301487715 Data Sheet

Intel

®

 Atom™ Processor E3800 Product Family

4434

Datasheet

See section 5.5.8 of the System Management Bus (SMBus) Specification, Version 2.0 
for the format of the protocol.

This command allows the SoC to perform block reads to certain I

2

C devices, such as 

serial EEPROMs. The SMBus Block Read supports the 7-bit addressing mode only.

However, this does not allow access to devices using the I

2

C “Combined Format” that 

has data bytes after the address. Typically these data bytes correspond to an offset 
(address) within the serial memory chips.

This command is supported independent of the setting of the 
SMB_Config_HCFG.I2C_EN bit. The I

2

C Read command with the 

SMB_Config_HCTL.PECEN bit set produces undefined results. Software must force both 
the SMB_Config_HCTL.PECEN and SMB_Mem_AUXC.AAC bit to 0b when running this 
command.

For I

2

C Read command, the value written into SMB_Mem_TSA.RW needs to be 1b. The 

format that is used for the command is shown in below table.

The SoC will continue reading data from the peripheral until the NAK is received.

1

Start

8:2

Slave Address – 7 bits

9

Write

10

Acknowledge from slave

18:11

Send Data 1 (SMB_Mem_HD1) register

19

Acknowledge from slave

20

Repeated Start

27:21

Slave Address – 7 bits

28

Read

29

Acknowledge from slave

37:30

Data byte 1 from slave – 8 bits

38

Acknowledge

46:39

Data byte 2 from slave – 8 bits

47

Acknowledge

–

Data bytes from slave / Acknowledge

–

Data byte N from slave – 8 bits

–

NOT Acknowledge

–

Stop