Altera Arria V GX FPGA Development Board - Manual (Page 48)

2–38 Chapter 2: Board Components
Components and Interfaces
Arria V GX FPGA Development Board November 2013 Altera Corporation
Reference Manual
Figure 2–8 shows the PCI Express reference clock levels.
The JTAG and SMB are optional signals in the PCI Express specification. Therefore,
the JTAG signal loopback from PCI Express TDI to PCI Express TDO and are not used
on this board. The SMB signals are wired to the Arria V GX FPGA but are not required
for normal operation.
Table 2–41 summarizes the PCI Express pin assignments. The signal names and
directions are relative to the Arria V GX FPGA.
Figure 2–8. PCI Express Reference Clock Levels
V MAX = 1.15 V
V CROSS MAX = 550 mV
V CROSS MIN = 250 mV
V MIN = –0.30 V
REFCLK –
REFCLK +
Table 2–41. PCI Express Pin Assignments, Schematic Signal Names, and Functions
Board
Reference (J4)
Schematic Signal Name
Arria V GX FPGA
Pin Number
I/O Standard Description
A5 PCIE_JTAG_TCK — 1.5-V PCML JTAG chain clock
A6 PCIE_JTAG_TDI — 1.5-V PCML JTAG chain data in
A7 PCIE_JTAG_TDO — 1.5-V PCML JTAG chain data out
A8 PCIE_JTAG_TMS — 1.5-V PCML JTAG chain mode select
A11 PCIE_PERSTN N9 1.5-V PCML Presence detect DIP switch
A1 PCIE_PRSNT1N — 1.5-V PCML Presence detect DIP switch
B17 PCIE_PRSNT2N_X1 — 1.5-V PCML Presence detect DIP switch
B31 PCIE_PRSNT2N_X4 — 1.5-V PCML Presence detect DIP switch
B48 PCIE_PRSNT2N_X8 — 1.5-V PCML Presence detect DIP switch
A14 PCIE_REFCLK_N AG33 1.5-V PCML Motherboard reference clock
A13 PCIE_REFCLK_P AG32 1.5-V PCML Motherboard reference clock
B15 PCIE_RX_N0 AW36 1.5-V PCML Receive bus
B20 PCIE_RX_N1 AT38 1.5-V PCML Receive bus
B24 PCIE_RX_N2 AP38 1.5-V PCML Receive bus
B28 PCIE_RX_N3 AM38 1.5-V PCML Receive bus
B34 PCIE_RX_N4 AH38 1.5-V PCML Receive bus
B38 PCIE_RX_N5 AF38 1.5-V PCML Receive bus
B42 PCIE_RX_N6 AD38 1.5-V PCML Receive bus
B46 PCIE_RX_N7 AB38 1.5-V PCML Receive bus
B14 PCIE_RX_P0 AW37 1.5-V PCML Receive bus
B19 PCIE_RX_P1 AT39 1.5-V PCML Receive bus
B23 PCIE_RX_P2 AP39 1.5-V PCML Receive bus