enhanced PLL Definition

A feature available in Stratix IV devices that employ a phase-locked loop (PLL). The enhanced PLL provides dynamic and manual clock switchover, programmable duty cycle, PLL reconfiguration, programmable phase shift, and programmable delay.

In Stratix IV family devices, the enhanced PLL is referred to as the top/bottom PLL.

You can take advantage of the enhanced PLL with the altpll megafunction.

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