Intel IXF1104 5.7.3.6.1Start Condition, 5.7.3.6.2Stop Condition, 5.7.3.6.3Acknowledge, Datasheet

IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller

Figure 25. Data Validity Timing

I2C_Data
I2C_Clk	DATA STABLE	DATA STABLE
		DATA
		CHANGE

5.7.3.6.1Start Condition

AHigh-to-Low transition of I2C_DATA, with I2C_CLK High, is a start condition that must precede any other command (see Figure 26).

5.7.3.6.2Stop Condition

ALow-to-High transition of the I2C_DATA with I2C_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 26. Start and Stop Definition Timing

I2C_Data

I2C_Data

START STOP

5.7.3.6.3Acknowledge

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).

112 Datasheet

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004