Finisar AN-2030 10 I/O Timing for Soft Control & Status Functions, SFF-8472 Compliance

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers

1

F i n i s a r

2	Table 3.10: I/O Timing for Soft Control & Status Functions
	Parameter	Symbol	Min	Max	Units	Conditions
	TX_DISABLE assert time	t_off			ms	Time from TX_DISABLE bit set1
				100
						until optical output falls below
						10% of nominal
	TX_DISABLE deassert time	t_on		100	ms	Time from TX_DISABLE bit
						cleared1 until optical output rises
						above 90% of nominal
	Time to initialize, including	t_init		300	ms	From power on or negation of
	reset of TX_FAULT					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 bit1 until receiver
						bandwidth is in conformance with
						appropriate specification
	Serial ID clock rate	f_serial_cl		100	kHz	n/a
		ock
	Analog parameter data ready	t_data		1000	ms	From power on to data ready, bit
	1 measured from falling clock edge after stop					0 of byte 110 set
			bit of	write transaction.
3

4SFF-8472 Compliance

5 Byte 94 contains an unsigned integer that indicates which feature set(s) are

6implemented in the transceiver.

7
8		Table 3.11: SFF-8472 Compliance
	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
9

10CC_EXT

11The check code is a one byte code that can be used to verify that the first 32 bytes of

12extended serial information in the SFP is valid. The check code shall be the low order 8

13bits of the sum of the contents of all the bytes from byte 64 to byte 94, inclusive.

9/26/02 Revision D Page 16