Chapter 3: Clock Sources; Overview - Xilinx Spartan-3A User Manual

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Clock Sources

Overview

The Spartan-3A/3AN Starter Kit board supports three primary clock input sources, as
shown in
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•
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Spartan-3A/3AN Starter Kit Board User Guide
UG334 (v1.0) May 28, 2007
Figure 3-1.
The board includes an on-board 50 MHz clock oscillator.
Clocks can be supplied off-board via an SMA-style connector. Alternatively, the FPGA
can generate clock signals or other high-speed signals on the SMA-style connector.
A 133 MHz clock oscillator is installed in the CLK_AUX socket. Optionally substitute
a separate eight-pin DIP-style clock oscillator in the provided socket.
Figure 3-1: Clock Sources on Starter Kit Board
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CLK_50MHZ
(E12)
CLK_SMA
(U12)
Chapter 3
CLK_AUX
(V12)
UG334_c3_01_052407
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