JGB-12LYAA1 JDS UNIPHASE, JGB-12LYAA1 Datasheet - Page 10

• Manufacturer Part Number: JGB-12LYAA1
• Manufacturer: JDS UNIPHASE

Specifications of JGB-12LYAA1

• Lead Free Status / RoHS Status: Not Compliant

JGB-12SYAA1
JGB-12LYAA1
Gigabit Ethernet GBIC
Serial Module Definition Protocol (Serial ID)
The GBICs with serial ID have identifying information stored in a Serial ID EEPROM. To read the serial data
from the serial ID module, the following must occur (refer to Serial ID Figures 1, 2, and 3 throughout these
steps):
10. Send an acknowledge signal to receive the next data word or send a stop command to stop receiving
The critical timings for communicating to the serial ID EEPROM are shown in Serial ID Figure 4 on page 11.
For more information on the Serial ID protocol, see Serial ID Data and Descriptions on page 22.
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1. Send a start sequence to the module.
2. Send the set data address sequence.
3. Receive an acknowledge signal.
4. Send the address of the first byte to read.
5. Receive an acknowledge signal.
6. Send a start command.
7. Send the read data sequence.
8. Receive an acknowledge signal.
9. Read a data word.
This is done by changing the data line from high to low while the clock is high.
The set data address sequence is 10100000. This sequence will allow the user to set the memory
address to start reading from.
Note: Be sure to toggle the data line only when the clock is low. Toggling the data line while the clock is
high indicates a start or stop condition.
One zero bit is the acknowledge signal.
The most significant bit of the address byte is the first bit and is ignored.
The read data sequence is 10100001. This sequence will allow the user to begin reading the data.
data.
A stop command is given by toggling the data from low to high while the clock is high.
Serial ID Figure 1
SDA
SCL
START
Start and Stop Timing
STOP
GBIC.1250
03/06/02