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Programmable Logic Design Quick Start Handbook

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PROGRAMMABLE LOGIC DESIGN: QUICK START HANDBOOK • CHAPTER 2<br />

Figure 2-34 illustrates how CoolCLOCK is created by internal clock cascading,<br />

with the divider and DualEDGE flip-flop working together.<br />

FIGURE 2-34:<br />

COOLCLOCK<br />

<strong>Design</strong> Security<br />

You can secure your designs during programming to prevent either accidental<br />

overwriting or pattern theft via readback.<br />

CoolRunner-II CPLDs have four independent levels of security provided<br />

on-chip, eliminating any electrical or visual detection of configuration patterns.<br />

Xilinx • 66

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