Altera Stratix IV E FPGA Development Board - Manual (Page 32)

2–24 Chapter 2: Board Components
General User Input/Output
Stratix IV E FPGA Development Board Reference Manual May 2011 Altera Corporation
Table 2–23 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
“Setup Elements” on
page 2–17 .
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 www.abracon.com
X1
25 MHz Crystal Oscillator,
LVCMOS/LVTTL
ECS, Inc. ECS-3953C-250-B www.ecsxtal.com
X5
50 MHz Oscillator, 2.5 V, clock
oscillator, SMD
ECS, Inc. ECS-3525-500-B-xx www.ecsxtal.com
Y2
100 MHz Oscillator, 1.8 V,
CMOS clock oscillator, SMD
Pletronics SM5545TEX-100.00M www.pletronics.com
X4
125 MHz Crystal Oscillator,
2.5 V, LVDS
Epson
EG-2121CA
125.0000M-LGPNL3
www.eea.epson.com
Y3
24 MHz Oscillator, 3.3 V,
CMOS clock oscillator, SMD
Pletronics SM5545TEV-24.0M www.pletronics.com
X2
100 MHz Crystal Oscillator,
2.5 V, LVDS
Epson
EG-2121CA
100.0000M-LHPNL3
www.eea.epson.com
X3 66 MHz Crystal Oscillator ECS, Inc. ECS-3953C-666-X www.ecsxtal.com