Xilinx Spartan-3E User Manual page 32

Chapter 4: FPGA Configuration Options
Click Configuration Options as shown in
Rate drop list, choose 25 to increase the internal CCLK oscillator to approximately
25 MHz, the fastest frequency when using an XCF04S Platform Flash PROM. Click OK
when finished.
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Figure 4-10: Set Properties for Bitstream Generator
Figure 4-11: Set CCLK Configuration Rate under Configuration Options
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UG230_c4_11_022706
Figure 4-11. Using the Configuration
Spartan-3E Starter Kit Board User Guide
UG230 (v1.0) March 9, 2006
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UG230_c4_12_022706