General user input/output, User-defined push-button switches, General user input/output –24 – Altera Stratix IV E FPGA Development Board User Manual
Page 32: User-defined push-button switches –24
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Chapter 2: Board Components
General User Input/Output
Stratix IV E FPGA Development Board Reference Manual
May 2011
Altera Corporation
lists the crystal oscillators component references and manufacturing
information.
General User Input/Output
This section describes the user I/O interface to the FPGA, including the push-buttons,
DIP switches, and LCD displays.
User-Defined Push-Button Switches
The development board includes four user-defined push-button switches. For
information on the board specific push-button switches, refer to
Board references S6 to S9 are push-button switches that allow you to interact with the
Stratix IV E device. When the switch is pressed and held down, the device pin is set to
logic 0; when the switch is released, the device pin is set to logic 1. There is no
board-specific function for these general user push-button switches.
50 MHz
CLKIN_50
X5.3
U19.V33 and U10.J12
6.000 MHz
USB_XTAL
Y1
U7.27 and U7.28 (USB PHY, FT245BL)
24 MHz
CLKIN_24MHZ
Y3
U8.E1 (Embedded USB-Blaster, EPM240M100)
100.00 MHz
CLKIN_MAX_100
Y2.3
U10.H12 (MAX II CPLD EPM2210 System Controller)
25 MHz
ENET_XTAL_25MHZ
X1
U15.55 (Ethernet PHY, Marvell 88E1111 PHY)
Table 2–22. Stratix IV E FPGA Development Board Clock Distribution (Part 2 of 2)
Frequency
Schematic Signal Name
Signal Originates From
Signal Propagates To
Table 2–23. Crystal Oscillator Component References and Manufacturing Information
Board
Reference
Description
Manufacturer
Manufacturer
Part Number
Manufacturer Website
Y1
6 MHz Crystal Oscillator
Abracon Corporation
ABL-6.000MHZ-B2
X1
25 MHz Crystal Oscillator,
LVCMOS/LVTTL
ECS, Inc.
ECS-3953C-250-B
X5
50 MHz Oscillator, 2.5 V, clock
oscillator, SMD
ECS, Inc.
ECS-3525-500-B-xx
Y2
100 MHz Oscillator, 1.8 V,
CMOS clock oscillator, SMD
Pletronics
SM5545TEX-100.00M
X4
125 MHz Crystal Oscillator,
2.5 V, LVDS
Epson
EG-2121CA
125.0000M-LGPNL3
Y3
24 MHz Oscillator, 3.3 V,
CMOS clock oscillator, SMD
Pletronics
SM5545TEV-24.0M
X2
100 MHz Crystal Oscillator,
2.5 V, LVDS
Epson
EG-2121CA
100.0000M-LHPNL3
X3
66 MHz Crystal Oscillator
ECS, Inc.
ECS-3953C-666-X