FW82801EB Intel, FW82801EB Datasheet - Page 233

• Manufacturer Part Number: FW82801EB
• Manufacturer: Intel

Specifications of FW82801EB

• Lead Free Status / RoHS Status: Not Compliant

Intel
®
Table 105. Send/Receive Byte Protocol with PEC
Table 106. Write Byte/Word Protocol without PEC
82801EB ICH5 / 82801ER ICH5R Datasheet
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
27:20
18:11
18:11
27:20
Bit
8:2
10
19
28
29
8:2
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 106
and
Table
107.
27:20
18:11
8:2
Bit
18:11
27:20
36:29
10
19
28
29
1
9
8:2
Bit
10
19
28
37
38
1
9
Acknowledge from slave
Data byte from slave
Start
Slave Address — 7 bits
Read
Acknowledge
PEC from slave
Not Acknowledge
Stop
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
Receive Byte Protocol
Write Word Protocol
Functional Description
Description
Description
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