DE4 User Manual
55
www.terasic.com
June 20, 2018
Figure 2
–23 Clock connections of the DE4
Table 2–20 Clock Selections
SW7 Setting Clock Selection
00
100 MHz
01
SMA_CLKIN
10
GCLKOUT
11
N/A
The Stratix IV GX FPGA consists of 7 dedicated clock input pins and from those pins, 1 dedicated
differential clock input listed in
Table 2–21
. In addition, there are a total of 8 PLLs available for the
Stratix IV GX device.
Table 2–21 Dedicated Clock Input Pins
Dedicated Clock Input Pins
HSMA_CLKIN_p1(differential)
HSMA_CLKIN_n1(differential)
HSMA_CLKIN0
OSC_50_B2
OSC_50_B5
OSC_50_B6
HSMB_CLKIN0
The dedicated clock input pins from the clock input multiplexer allow users to use any of these
clocks as a source clock to drive the Stratix IV PLL circuit through the GCLK and RCLK networks.
Alternatively, PLLs through the GCLK and RCLK networks or from dedicated connections on
Summary of Contents for ALTERA DE4
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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 ...