Altera Stratix IV GX FPGA Development Board - Manual (Page 40)

2–32 Chapter 2: Board Components
Components and Interfaces
Stratix IV GX FPGA Development Board August 2012 Altera Corporation
Reference Manual
Figure 2–9 shows the PCI Express reference clock levels.
The JTAG and SMB are optional signals in the PCI Express specification. Both types of
signals are wired to the Stratix IV GX device but are not required for normal
operation.
Table 2–34 lists the PCI Express pin assignments. The signal names and
directions are relative to the Stratix IV GX FPGA.
Figure 2–9. 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 2–34. PCI Express Pin Assignments, Schematic Signal Names, and Functions (Part 1 of 2)
Board Reference Description Schematic Signal
Name
I/O Standard
Stratix IV GX
Device
Pin Number
J17.A47 Add-in card transmit bus PCIE_TX_P7 1.4-V PCML P36
J17.A48 Add-in card transmit bus PCIE_TX_N7 1.4-V PCML P37
J17.A43 Add-in card transmit bus PCIE_TX_P6 1.4-V PCML T36
J17.A44 Add-in card transmit bus PCIE_TX_N6 1.4-V PCML T37
J17.A39 Add-in card transmit bus PCIE_TX_P5 1.4-V PCML AB36
J17.A40 Add-in card transmit bus PCIE_TX_N5 1.4-V PCML AB37
J17.A35 Add-in card transmit bus PCIE_TX_P4 1.4-V PCML AD36
J17.A36 Add-in card transmit bus PCIE_TX_N4 1.4-V PCML AD37
J17.A29 Add-in card transmit bus PCIE_TX_P3 1.4-V PCML AF36
J17.A30 Add-in card transmit bus PCIE_TX_N3 1.4-V PCML AF37
J17.A25 Add-in card transmit bus PCIE_TX_P2 1.4-V PCML AH36
J17.A26 Add-in card transmit bus PCIE_TX_N2 1.4-V PCML AH37
J17.A21 Add-in card transmit bus PCIE_TX_P1 1.4-V PCML AP36
J17.A22 Add-in card transmit bus PCIE_TX_N1 1.4-V PCML AP37
J17.A16 Add-in card transmit bus PCIE_TX_P0 1.4-V PCML AT36
J17.A17 Add-in card transmit bus PCIE_TX_N0 1.4-V PCML AT37
J17.B45 Add-in card receive bus PCIE_RX_P7 1.4-V PCML R38
J17.B46 Add-in card receive bus PCIE_RX_N7 1.4-V PCML R39
J17.B41 Add-in card receive bus PCIE_RX_P6 1.4-V PCML U38
J17.B42 Add-in card receive bus PCIE_RX_N6 1.4-V PCML U39
J17.B37 Add-in card receive bus PCIE_RX_P5 1.4-V PCML AC38
J17.B38 Add-in card receive bus PCIE_RX_N5 1.4-V PCML AC39
J17.B33 Add-in card receive bus PCIE_RX_P4 1.4-V PCML AE38
J17.B34 Add-in card receive bus PCIE_RX_N4 1.4-V PCML AE39