DE5-Net User Manual
June 20, 2018
42
Table 2-21
SFP+ C Pin Assignments, Schematic Signal Names, and Functions
Schematic
Signal Name
Description
I/O Standard
Stratix V GX
Pin Number
SFPD_TX_p
Transmitter data
1.4-V PCML
PIN_AY6
SFPD_TX_n
Transmitter data
1.4-V PCML
PIN_AY5
SFPD_RX_p
Receiver data
1.4-V PCML
PIN_BB2
SFPD_RX_n
Receiver data
1.4-V PCML
PIN_BB1
SFPD_LOS
Signal loss indicator
2.5V
PIN_N22
SFPD_MOD0_PRSNT_n Module present
2.5V
PIN_V20
SFPD_MOD1_SCL
Serial 2-wire clock
2.5V
PIN_U21
SFPD_MOD2_SDA
Serial 2-wire data
2.5V
PIN_V19
SFPD_RATESEL0
Rate select 0
2.5V
PIN_V21
SFPD_RATESEL1
Rate select 1
2.5V
PIN_M22
SFPD_TXDISABLE
Turns off and disables the transmitter output 2.5V
PIN_U20
SFPD_TXFAULT
Transmitter fault
2.5V
PIN_T21
2
2
.
.
1
1
1
1
P
P
C
C
I
I
E
E
x
x
p
p
r
r
e
e
s
s
s
s
The FPGA development board is designed to fit entirely into a PC motherboard with x8 or x16 PCI
Express slot. Utilizing built-in transceivers on a Stratix V GX device, it is able to provide a fully
integrated PCI Express-compliant solution for multi-lane (x1, x4, and x8) applications. With the
PCI Express hard IP block incorporated in the Stratix V GX device, it will allow users to implement
simple and fast protocol, as well as saving logic resources for logic application.
presents the pin connection established between the Stratix V GX and PCI Express.
The PCI Express interface supports complete PCI Express Gen1 at 2.5Gbps/lane, Gen2 at
5.0Gbps/lane, and Gen3 at 8.0Gbps/lane protocol stack solution compliant to PCI Express base
specification 3.0 that includes PHY-MAC, Data Link, and transaction layer circuitry embedded in
PCI Express hard IP blocks.
Please note that it is a requirement that you connect the PCIe external power connector to 6-pin 12V
DC power connector in the FPGA to avoid FPGA damage due to insufficient power. The
PCIE_REFCLK_p signal is a differential input that is driven from the PC motherboard on this
board through the PCIe edge connector. A DIP switch (SW7) is connected to the PCI Express to
allow different configurations to enable a x1, x4, or x8 PCIe.