Finisar AN-2030 - Manual (Page 16)

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers
F i n i s a r
9/26/02 Revision D Page 16
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Table 3.10: I/O Timing for Soft Control & Status Functions 2
Parameter Symbol Min Max Units Conditions
TX_DISABLE assert time t_off 100 ms Time from TX_DISABLE bit set
1
until optical output falls below
10% of nominal
TX_DISABLE deassert time t_on 100 ms Time from TX_DISABLE bit
cleared
1
until optical output rises
above 90% of nominal
Time to initialize, including
reset of TX_FAULT
t_init 300 ms From power on or negation of
TX_FAULT using TX_DISABLE;
serial communication possible
TX_FAULT assert time t_fault 100 ms Time from fault to TX_FAULT bit
set.
LOS assert time t_loss_on 100 ms Time from LOS state to RX_LOS
bit set
LOS deassert time t_loss_off 100 ms Time from non-LOS state to
RX_LOS bit cleared
Rate select change time T_rate_sel 100 ms Time from change of state of Rate
Select bit
1
until receiver
bandwidth is in conformance with
appropriate specification
Serial ID clock rate f_serial_cl
ock
100 kHz n/a
Analog parameter data ready t_data 1000 ms From power on to data ready, bit
0 of byte 110 set
1
measured from falling clock edge after stop bit of write transaction.
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SFF-8472 Compliance 4
Byte 94 contains an unsigned integer that indicates which feature set(s) are 5
implemented in the transceiver. 6
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Table 3.11: SFF-8472 Compliance 8
Data Address Value Interpretation
94 0 Digital diagnostic functionality not included or
undefined.
94 1 Includes functionality described in Rev 9.3
SFF-8472.
94 2 TBD
94 3 TBD
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CC_EXT 10
The check code is a one byte code that can be used to verify that the first 32 bytes of
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extended serial information in the SFP is valid. The check code shall be the low order 8 12
bits of the sum of the contents of all the bytes from byte 64 to byte 94, inclusive. 13