Digilent 410-044-10P-KIT - Manual (Page 35)

Spartan-3 Starter Kit Board User Guide www.xilinx.com 35
UG130 (v1.1) May 13, 2005 1-800-255-7778
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Chapter 8
Clock Sources
The Spartan-3 Starter Kit board has a dedicated 50 MHz Epson SG-8002JF series clock
oscillator source and an optional socket for another clock oscillator source. Figure A-5
provides a detailed schematic for the clock sources.
The 50 MHz clock oscillator is mounted on the bottom side of the board, indicated as
in Figure A-5 . Use the 50 MHz clock frequency as is or derive other frequencies using the
FPGAs Digital Clock Managers (DCMs).
•
Using Digital Clock Managers (DCMs) in Spartan-3 FPGAs
http://www.xilinx.com/bvdocs/appnotes/xapp462.pdf
The oscillator socket, indicated as in Figure 1-2 , accepts oscillators in an 8-pin DIP
footprint.
Table 8-1: Clock Oscillator Sources
Oscillator Source FPGA Pin
50 MHz (IC4) T9
Socket (IC8) D9
14
15