Altera Cyclone V E FPGA Development Board - Manual (Page 28)

2–20 Chapter 2: Board Components
General User Input/Output
Cyclone V E FPGA Development Board March 2013 Altera Corporation
Reference Manual
Off-Board Clock Input/Output
The development board has input and output clocks which can be driven onto the
board. The output clocks can be programmed to different levels and I/O standards
according to the FPGA device’s specification.
Table 2–11 lists the clock inputs for the development board.
Table 2–12 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 S5, S6, S7, and S8 are push buttons for controlling the FPGA designs
that loads into the Cyclone V E FPGA 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.
Table 2–11. Off-Board Clock Inputs
Source
Schematic Signal
Name
I/O Standard
Cyclone V E
FPGA Pin
Number
Description
SMA
CLKIN_SMA_P LVDS —
Input to LVDS fan-out buffer.
CLKIN_SMA_N LVDS —
Samtec HSMC HSMA_CLK_IN0 2.5-V AB16
Single-ended input from the installed HSMC cable
or board.
Samtec HSMC
HSMA_CLK_IN_P1 LVDS/2.5-V AB14 LVDS input from the installed HSMC cable or
board. Can also support 2x LVTTL inputs.
HSMA_CLK_IN_N1 LVDS/LVTTL AC14
Samtec HSMC
HSMA_CLK_IN_P2 LVDS/LVTTL Y15
LVDS input from the installed HSMC cable or
board. Can also support 2x LVTTL inputs.
HSMA_CLK_IN_N2 LVDS/LVTTL AA15
Table 2–12. Off-Board Clock Outputs
Source
Schematic Signal
Name
I/O Standard
Cyclone V E
FPGA Pin
Number
Description
Samtec HSMC HSMA_CLK_OUT0 2.5V CMOS AJ14 FPGA CMOS output (or GPIO)
Samtec HSMC
HSMA_CLK_OUT_P1 LVDS/2.5V CMOS AE22 LVDS output. Can also support 2x CMOS
outputs.
HSMA_CLK_OUT_N1 LVDS/2.5V CMOS AF23
Samtec HSMC
HSMA_CLK_OUT_P2 LVDS/2.5V CMOS AG23 LVDS output. Can also support 2x CMOS
outputs.
HSMA_CLK_OUT_N2 LVDS/2.5V CMOS AH22
SMA CLKOUT_SMA 2.5V CMOS F9 FPGA CMOS output (or GPIO)