FW82801DB S L66K Intel, FW82801DB S L66K Datasheet - Page 212

• Manufacturer Part Number: FW82801DB S L66K
• Manufacturer: Intel

Specifications of FW82801DB S L66K

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Functional Description
212
Table 5-80. Send/Receive Byte Protocol with PEC
Table 5-81. Write Byte/Word Protocol without PEC
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. The format
of the protocol is shown in
20–27
11–18
11–18
20–27
2–8
Bit
10
19
28
29
2–8
Bit
1
9
10
19
28
29
1
9
Start
Slave Address - 7 bits
Write
Acknowledge from slave
Command code - 8 bits
Acknowledge from slave
PEC
Acknowledge from slave
Stop
Start
Slave Address - 7 bits
Write
Acknowledge from slave
Command code - 8 bits
Acknowledge from slave
Data Byte - 8 bits
Acknowledge from Slave
Stop
Send Byte Protocol
Write Byte Protocol
Description
Description
Table 5-81
and
Table
5-82.
20–27
11–18
2–8
20–27
29–36
11–18
Bit
10
19
28
29
1
9
2–8
Bit
10
19
28
37
38
1
9
Data byte from slave
PEC from slave
Start
Slave Address - 7 bits
Read
Acknowledge from slave
Acknowledge
Not Acknowledge
Stop
Receive Byte Protocol
Start
Slave Address - 7 bits
Write
Acknowledge from slave
Command code - 8 bits
Acknowledge from slave
Data Byte Low - 8 bits
Acknowledge from Slave
Data Byte High - 8 bits
Acknowledge from slave
Stop
Write Word Protocol
Intel
®
82801DB ICH4 Datasheet
Description
Description