Table 1: SFP Pin Description
Pin
Name
Function
Notes
1
VEE
Ground
2
VEE
Ground
TX_FAULT never asserted by this module
3
TX_DIS
Transmitter Disable
TX_DIS is an active high input that is used to shut down the transmitter electrical output.
It is internally pulled up with a 4.7kΩ to 10kΩ resistor. (The output may be disabled by
registry even if TX_DIS=’0’)
High/Open = Transmitter Disabled
Low = Transmitter Enabled
4
MOD_DEF[2]
Module Definition 2
Defined as Serial Data (SDA). Must be pulled up to VCC (4.7k‐10kΩ) on the
host board (open drain).
5
MOD_DEF[1]
Module Definition 1
Defined as Serial Clock (SCL). Must be pulled up to VCC (4.7k‐10kΩ) on the
host board (open drain).
6
MOD_DEF[0]
Module Definition 0
Grounded by the module to indicate that the module is present.
7
NC (RATE)
Not Connected
Floating; not internally connected
8
LOS
Loss of signal
LOS is an active high open‐drain output that returns the loss of a valid SDI input by the
receiver equalizer.
High = No carrier detected
Low = Carrier detected
9
VEE
Ground
10
VEE
Ground
11
VEE
Ground
12
RD‐
Inv. Received Data Out
RD± are the differential receiver outputs. They are AC coupled 100Ω differential lines
which should be terminated with 100Ω differential at the user SERDES/ASIC. The voltage
swing on these lines will be between 620mV and 880mV differential when properly
terminated.
13
RD+
Received Data Out
14
VEE
Ground
15
VCC
+3.3V Supply
Defined as 3.3V±5% ate the SFP connector pin. Recommended host board power filtering
is shown in figure 5.2. When the recommended supply filtering network is used, hot
plugging of module will result in an inrush current of no more than 30mA greater than
the steady state value.
16
VCC
+3.3V Supply
17
VEE
Ground
18
TD+
Transmit Data In
TD± are the differential inputs of the transmitter. They are AC coupled differential lines
with 100Ω differential termination inside the module. The AC coupling is done inside the
module and is thus not required on the host board. The inputs will accept differential
swing of 200mV to 1600mV.
19
TD‐
Inv. Transmit Data In
20
VEE
Ground
