2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

S-34C02A

Seiko Instruments Inc.

9

Operation

1. Start Condition

A start condition starts by changing the SDA line from “H” to “L” while the SCL line is “H”.

All operations start with a start condition.

2. Stop Condition

A stop condition starts by changing the SDA line from “L” to “H” while the SCL line is “H”.

During Read sequence if the S-34C02A receives a stop condition, its Read operation is interrupted so that the S-

34C02A goes in the standby mode.

During Write sequence if the S-34C02A receives a stop condition, the S-34C02A finishes installing Write data so that

the Write operation starts.

Start Condition

Stop Condition

SCL

SDA

(in)

Figure 6 Start / Stop Conditions