Altera Cyclone IV GX Transceiver Starter Board Manuel d'utilisateur télécharger pdf (Page 28)

2–20 Chapter 2: Board Components

Components and Transceiver Interfaces

Cyclone IV GX Transceiver Starter Board Reference Manual © March 2010 Altera Corporation

The PCI Express interface supports a channel width of ×1 as well as the connection

speed of Gen1 at 2.5 Gbps/lane.

The board’s power can be sourced entirely from the PCI Express edge connector when

installed into a PC motherboard. Turn the power switch (SW1) to ON position when

you install the board into a PC motherboard. Although the board can also be powered

by a laptop power supply for use on a lab bench, it is not recommended to use from

both supplies at the same time. Ideal diode power sharing devices have been

designed into this board to prevent damages or back-current from one supply to the

other.

The PCIE_REFCLK_P and PCIE_REFCLK_N signals are a 100-MHz differential input

that is driven from the PC motherboard on this board through the PCI Express edge

connector. This signal connects directly to a Cyclone IV GX REFCLK input pin pair.

This clock is terminated on the motherboard and therefore, no on-board termination is

required. This clock can have spread-spectrum properties that change its period

between 9.847

ps to 10.203 ps. The I/O standard is High-Speed Current Steering Logic

(HCSL).

By default, the GXB_RX0 channel of the FPGA is connected to the PCIE_RX_P and

PCIE_RX_N signals, while the GXB_TX0 channel is connected to the PCIE_TX_P and

PCIE_TX_N signals.

Table 2–24 summarizes the PCI Express pin assignments. The signal names and

directions are relative to the Cyclone IV GX FPGA.

Table 2–24. PCI Express Pin Assignments, Schematic Signal Names, and Functions

Board Reference Description Schematic Signal Name I/O Standard

Cyclone IV GX

Device

Pin Number

U14.A16 Add-in card transmit bus PCIE_TX_P

1.4-V PCML

U14.A17 Add-in card transmit bus PCIE_TX_N G1

U14.B14 Add-in card receive bus PCIE_RX_P J2

U14.B15 Add-in card receive bus PCIE_RX_N J1

U14.A13 Motherboard reference clock PCIE_REFCLK_P

HCSL

U14.A14 Motherboard reference clock PCIE_REFCLK_N J7

U14.A11 Reset PCIE_PERSTn LVTTL A10

U14.A1 Present PCIE_PRSNTn_x1 ——

U14.B17 x1 Present PCIE_PRSNTn_x1 ——

U14.A5 Motherboard TCK PCIE_JTAG_TCK

3.3-V

—

U14.A6 Motherboard TDI PCIE_JTAG_TDI —

U14.A7 Motherboard TDO PCIE_JTAG_TDO —

U14.A8 Motherboard TMS PCIE_JTAG_TMS —

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 39 40

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Altera Cyclone IV GX Transceiver Starter Board Manuel d'utilisateur Page 28

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