DE4 User Manual
56
www.terasic.com
June 20, 2018
adjacent top/bottom and left/right PLLs can also drive the PLL circuit. The clock outputs of Stratix
IV GX FPGA are derived from various interfaces, notably the HSMC and the SMA connectors.
Stratix IV GX FPGA Transceiver Clock Inputs
The transceiver reference clock inputs for the serial protocols supported by the Stratix IV GX FPGA
transceiver channels include the PCI Express (PIPE), SATA, and through the SMA connectors.
The DE4 uses three programmable low-jitter clock generators with default clock output of 100MHz
and an I/O standard of LVDS that is non-configurable. The clock generators are programmed via
Max II CPLD to generate the necessary clocks for the Stratix IV GX transceiver protocols and
interfaces such as SATA and HSMC. The PCI Express (PIPE) transceiver reference clock is
generated from the PCIe connector.
The clock frequency for the programmable clock generators can be specified by using the DE4
control panel, DE4 system builder, or the external clock generator demo provided. Note that signals
PLL_CLKIN and SATA_REFCLK share the same clock generator which would lead to the same
output frequency for both signals.
The associated pin assignments for clock buffer and SMA connectors to FPGA I/O pins are shown
in
Table 2–22
.
Table 2–22 Clock Inputs/Outputs Pin Assignments, Schematic Signal Names, and Functions
Board
Reference
Schematic
Signal Name
Description
I/O Standard
Stratix IV GX
Pin Number
-
OSC_50_B2
Dedicated 50MHz clock
input for bank 2C
2.5-V
PIN_AC35
-
OSC_50_B3
50MHz clock input for bank
3C
1.8-V
PIN_AV22
-
OSC_50_B4
50MHz clock input for bank
4C
1.8-V
PIN_AV19
-
OSC_50_B5
50MHz clock input for bank
5C
3.0-V
PIN_AC6
-
OSC_50_B6
50MHz clock input for bank
6C
2.5-V
PIN_AB6
-
OSC_50_B7
50MHz clock input for bank
7C
1.8-V
PIN_A19
-
GCLKIN
100MHz or SMA_CLKIN or
GCLKOUT clock input
1.8-V
PIN_A21
-
GCLKOUT_FPGA
Single-ended clock output 1.8-V
PIN_AH19
Summary of Contents for ALTERA DE4
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Page 54: ...DE4 User Manual 54 www terasic com June 20 2018 ...
Page 83: ...DE4 User Manual 83 www terasic com June 20 2018 Figure 3 8 Access DDR2 SO DIMM memory ...
Page 92: ...DE4 User Manual 92 www terasic com June 20 2018 Figure 3 17 Fan Control of the DE4 ...
Page 150: ...DE4 User Manual 150 www terasic com June 20 2018 Figure 5 35 SOPC builder ...