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
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