Altera Cyclone V GT FPGA Development Board - Manual (Page 29)

Chapter 2: Board Components 2–21
General User Input/Output
September 2014 Altera Corporation Cyclone V GT FPGA Development Board
Reference Manual
Table 2–13 lists the clock outputs for the development board.
General User Input/Output
This section describes the user I/O interface to the FPGA, including the push buttons,
DIP switches, LEDs, and character LCD.
User-Defined Push Buttons
The development board includes three user-defined push buttons. For information on
the system and safe reset push buttons, refer to
“Setup Elements” on page 2–16 .
Board references S1, S2, and S3 are push buttons for controlling the FPGA designs that
loads into the Cyclone V GT device. When you press and hold down the switch, the
device pin is set to logic 0; when you release the switch, the device pin is set to logic 1.
There are no board-specific functions for these general user push buttons.
Samtec HSMC
HSMB_CLK_IN0 2.5-V A22
Single-ended input from the installed HSMC cable
or board.
HSMB_CLK_IN_P1 LVDS/2.5-V K25 LVDS input from the installed HSMC cable or
board. Can also support 2x LVTTL inputs.
HSMB_CLK_IN_N1 LVDS/LVTTL J25
HSMB_CLK_IN_P2 LVDS/LVTTL J20 LVDS input from the installed HSMC cable or
board. Can also support 2x LVTTL inputs.
HSMB_CLK_IN_N2 LVDS/LVTTL K19
PCI Express
Edge PCIE_REFCLK_P HCSL W11
HCSL input from the PCI Express edge connector.
PCIE_REFCLK_N HCSL V10
Table 2–12. Off-Board Clock Inputs (Part 2 of 2)
Source
Schematic Signal
Name
I/O Standard
Cyclone V GT
Pin Number
Description
Table 2–13. Off-Board Clock Outputs
Source
Schematic Signal
Name
I/O Standard
Cyclone V GT
Pin Number
Description
LVDS SMA
CLKOUT_SMA_P LVPECL —
Driven from LVDS clock buffer U3
CLKOUT_SMA_N LVPECL —
Samtec HSMC
HSMA_CLK_OUT0 2.5V CMOS F10 FPGA CMOS output (or GPIO)
HSMA_CLK_OUT_P1 LVDS/2.5V CMOS C1 LVDS output. Can also support 2x CMOS
outputs.
HSMA_CLK_OUT_N1 LVDS/2.5V CMOS B1
HSMA_CLK_OUT_P2 LVDS/2.5V CMOS B18
LVDS output. Can also support 2x CMOS
outputs.
HSMA_CLK_OUT_N2 LVDS/2.5V CMOS A18
Samtec HSMC
HSMB_CLK_OUT0 2.5V CMOS D25 FPGA CMOS output (or GPIO)
HSMB_CLK_OUT_P1 LVDS/2.5V CMOS L22 LVDS output. Can also support 2x CMOS
outputs.
HSMB_CLK_OUT_N1 LVDS/2.5V CMOS K22
HSMB_CLK_OUT_P2 LVDS/2.5V CMOS F26 LVDS output. Can also support 2x CMOS
outputs.
HSMB_CLK_OUT_N2 LVDS/2.5V CMOS G26
SMA SMA_CLKOUT 2.5V CMOS AF33 FPGA CMOS output (or GPIO)