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Intel
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IXF1104 4-Port Gigabit Ethernet Media Access Controller
113 Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
5.7.3.5 Port Protocol Operation
5.7.3.6 Clock and Data Transitions
The I
2
C_DATA is normally pulled High with an extra device. Data on the I
2
C_DATA pin changes
only during the I
2
C_CLK Low time periods (see Figure 25). Data changes during I
2
C_CLK High
periods indicate a start or stop condition.
5.7.3.6.1 Start Condition
A High-to-Low transition of I
2
C_DATA, with I
2
C_CLK High, is a start condition that must
precede any other command (see Figure 26).
5.7.3.6.2 Stop Condition
A Low-to-High transition of the I
2
C_DATA with I
2
C_CLK High is a stop condition. After a Read
sequence, the stop command places the E²PROM and the optical module in a standby power mode
(see Figure 26).
Figure 25. Data Validity Timing
DATA STABLE DATA STABLE
DATA
CHANGE
I
2
C_Data
I
2
C_Clk
Figure 26. Start and Stop Definition Timing
START
STOP
I
2
C_Data
I
2
C_Data