AFCT-701SDDZ Datasheet, PDF (14/20 Pages) AVAGO TECHNOLOGIES LIMITED – 10Gb/1Gb Ethernet, 1310nm SFP+ Transceiver

Table 9. Control Functions: Low Speed Signals Timing Characteristics
The following characteristics are defined over the Recommended Operating Conditions unless otherwise noted.
Parameter
Symbol
Minimum
Maximum Unit Notes
TX_DISABLE Assert Time
t_off
100
Ps
Note 1 , Fig. 5
TX_DISABLE Negate Time
t_on
2
ms
Note 2 , Fig. 5
Time to initialize, including reset of TX_FAULT
t_init
300
ms
Note 3 , Fig. 5
TX_FAULT Assert Time
t_fault
1000
Ps
Note 4 , Fig. 5
TX_DISABLE to Reset
t_reset
10
Ps
Note 5 , Fig. 5
RX_LOS Assert Time
t_los_on
100
Ps
Note 6 , Fig. 5
RX_LOS Deassert Time
t_los_off
100
Ps
Note 7 , Fig. 5
Rate Select Time
t_rate
40
ms
Notes:
1. Time from rising edge of TX_DISABLE to when the optical output falls below 10% of nominal. A 10 ms interval between assertions of
TX_DISABLE is required.
2. Time from falling edge of TX_DISABLE to when the modulated optical output rises above 90% of nominal.
3. Time from power on or falling edge of TX_DISABLE to when the modulated optical output rises above 90% of nominal and the Two-Wire
interface is available.
4. From power on or negation of TX_FAULT using TX_DISABLE.
5. Time TX_DISABLE must be held high to reset the laser fault shutdown circuitry.
6. Time from loss of optical signal to Rx_LOS Assertion.
7. Time from valid optical signal to Rx_LOS De-Assertion.
Table 10. Control Functions: Two-Wire Interface Timing Characteristics
The following characteristics are defined over the Recommended Operating Conditions unless otherwise noted.
Parameter
Symbol
Minimum
Maximum Unit Notes
TX_DISABLE Assert Time
t_off_twi
100
ms
Note 1
TX_DISABLE Negate Time
t_on_twi
100
ms
Note 2
TX_FAULT Assert Time
t_fault_twi
100
ms
Note 3
Rx_LOS Assert Time
t_loss_on_twi
100
ms
Note 4
Rx_LOS Deassert Time
t_loss_off_twi
100
ms
Note 5
Analog parameter data ready
t_data
1000
ms
Note 6
Two-Wire Interface Ready
t_serial
300
ms
Note 7
Complete Single or Sequential Write up to 4 Byte t_write
40
ms
Note 8
Complete Sequential Write of 5-8 Byte
t_write
80
ms
Note 8
Two-Wire Interface Clock Rate
f_serial_clock
400
kHz Note 8
Time bus free before new
transmission can start
t_buf
20
Ps
Note 9
Notes:
1. Time from two-wire interface assertion of TX_DISABLE (A2h, byte 110, bit 6) to when the optical output falls below 10% of nominal. Measured
from falling clock edge after stop bit of write transaction.
2. Time from two-wire interface de-assertion of TX_DISABLE (A2h, byte 110, bit 6) to when the modulated optical output rises above 90% of
nominal.
3. Time from fault to two-wire interface TX_FAULT (A2h, byte 110, bit 2) asserted.
4. Time for two-wire interface assertion of Rx_LOS (A2h, byte 110, bit 1) from loss of optical signal.
5. Time for two-wire interface de-assertion of Rx_LOS (A2h, byte 110, bit 1) from presence of valid optical signal.
6. From power on to data ready bit asserted (A2h, byte 110, bit 0). Data ready indicates analog monitoring circuitry is functional.
7. Time from power on until module is ready for data transmission over the two-wire interface (reads or writes over A0h and A2h).
8. Operation of the Two Wire Serial Interface at rtes beyond 100kHz requires the use of clock stretching techniques.
9. Between STOP and START. See SFF 8431 Section 4.3
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