Each SFP+ interface has the following signals:
• Transceivers, x1 for each SFP+, up to 12.5 Gbps
• SMBUS (I
2
C), 3.3V for SFP+ and I/O expander, level-translated 10 1.8V with
U22/U23
• IRQ of I/O expander, 3.3V level-translated to 1.8V with U19
Each SFP+ module has six status/control signals and two LEDs. The FPGA device does
not have enough I/O pins for these signals, hence an I/O expander is used to
implement these I/Os for each SFP+ connector. The I
2
C I/O expander is on the same
I
2
C bus as the SFP+ module, and the I
2
C bus of two SFP+ modules are independent of
each other.
The I/O expander used is TI TCA9534PWR. U20 is for SFP+ 0, with I
2
C address
7'b010_0000. U21 is for SFP+, with I
2
C address 7'b010_0000.
The I/O expander has 8 I/Os. The definition of the I/Os is shown in the table below.
The device is controlled with I
2
C bus.
Table 16. I/O Expander: I/O Definition
I/O Number Signal I/O Type Function
P0
SFP_RLED
Output Red LED, indicates LOS/ERR,
"0" - ON
P1
SFP_GLED
Output Green LED, indicates Link,
"0" - ON
P2
SFP_TXDIS
Output Tx_Disable, Pulled up,
Transmitter is turned off if
high
P3
SFP_TFLT
Input Tx_Fault, Pulled up,
indicates fault when high
P4
SFP_RS1
Output Rate Select, Pulled up with
1K resistor
P5
SFP_RLOS
Input Rx_LOS, Pulled up, indicates
LOS when high
P6
SFP_RS0
Output Rate Select, Pulled up with
1K resistor
P7
SFP_PRSN
Input Mod_ABS, Pulled up, module
in place when low
The I/Os of TCA9534 is in high impedance input mode upon power up. Hence, the
module is placed in TX_Disable mode and the LEDs are off. The status changes on the
I/Os are reported with an IRQ to the FPGA. Each I/O expander has its own dedicated
IRQ signal.
4.9.4 USB3.1 Type-C Interface
A USB3.1 Type-C interface (J8) is provided on the PCIe bracket. The interface supports
SuperSpeed up to 10 Gbps as well as the backward compatible support of USB2.0.
4 Development Board Components
UG-20105 | 2017.12.18
Intel
®
Cyclone
®
10 GX FPGA Development Kit User Guide
30
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