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IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller
112 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
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).
5.7.3.6.3 Acknowledge
All addresses and data words are serially transmitted to and from the optical module in 8-bit words.
The optical module E²PROM sends a zero to acknowledge that it has received each word, which
happens during the ninth clock cycle (see Figure 27).
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