How many PLLs are available in Cyclone III FPGAs? What PLL features are available?
Cyclone III FPGAs offer up to four PLLs. These PLLs provide general-purpose clocking management capabilities such as multiplication and phase shifting, programmable duty cycle, programmable bandwidth, spread spectrum input clocking, lock detection, as well as outputs for differential I/O support. The external clock outputs (one per PLL) can be used to provide clocks to other devices in the system, eliminating the need for other clock-management devices on the board. Please refer to the Cyclone III system clock management page for more details.
