FWLF-1631-XX DWDM SFP Preliminary Product Specification – August 2005
F i n i s a r
IX. Serial Communication Protocol
All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP
MSA1. These SFPs use an Atmel AT24C01A 128 byte E2PROM with an address of A0h.
For details on interfacing with the E2PROM, see the Atmel data sheet titled
“AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM.”7
Finisar’s DWDM SFPs also support extended diagnostic features as described in Finisar
Applications Note AN-2030, “Digital Diagnostic Monitoring Interface for Optical
Transceivers”5. (Additional information is available in document titled: “Digital Diagnostic
Monitoring Interface for Optical Transceivers Rev 9.3”8). A controller IC that monitors
system parameters such as laser current, module temperature, transmitter power, and
received power is accessible at address A2H.
Parameter
Symbol Min Typ
Catmel
Max
Units Notes/Conditions
I2C Clock for Atmel
(A0H) and Controller
IC (A2H)
0
100,000
Hz Bus can be driven blind.
Ó Finisar Corporation
PRELIMINARY and Confidential
Page 8
Rev B, August 2005
FINISAR [ FINISAR CORPORATION. ]
