FTR-1631-XX DWDM GBIC Preliminary Product Specification
Finisar
IX. Serial Communication Protocol
All Finisar optical GBICs implement serial identification features described for ‘Module
Definition “4”’ as outlined in Annex D of the GBIC Specification
1
. These GBICs use an
Atmel AT24C01A 128 byte E
2
PROM at address A0H. For details on interfacing with the
E
2
PROM, see the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire Serial CMOS
E
2
PROM.”
3
Finisar’s DWDM GBICs also support extended diagnostic features as described in
Finisar Applications Note AN-2030, “Digital Diagnostic Monitoring Interface for Optical
Transceivers”
2
. A controller IC that monitors system parameters such as laser current,
module temperature, transmitter power, and received power is accessible at address A2H.
Parameter
I
2
C Clock for Atmel
(A0H) and Controller
IC (A2H)
Symbol
C
atmel
Min
0
Typ
Max
100,000
Units Notes/Conditions
Hz
Bus can be driven blind.
Table 9. I
2
C Timing Requirements
©
Finisar Corporation
Rev J, August 2004
PRELIMINARY and Confidential
Page 8
FINISAR [ FINISAR CORPORATION. ]
