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1.2. PLLs Overview
Phase-locked loops (PLLs) provide robust clock management and synthesis for device clock management, external system clock management, and high-speed I/O interfaces.
The Stratix® 10 device family contains the following PLLs for core applications:
- fPLLs—can function as fractional PLLs or integer PLLs
- I/O PLLs—can only function as integer PLLs
The fPLLs are located adjacent to the transceiver blocks in the transceiver banks. Each transceiver bank contains two fPLLs. You can configure each fPLL independently in either conventional integer mode, or fractional mode. In fractional mode, the fPLL can operate with third-order delta-sigma modulation. You can configure each fPLL to generate either a transmitter (TX) clock for a transceiver or to provide a single clock to the core.
The I/O PLLs are located adjacent to the hard memory controllers and LVDS serializer/deserializer (SERDES) blocks in the I/O banks. Each I/O bank contains one I/O PLL. The I/O PLLs can operate in conventional integer mode. Each I/O PLL has nine C counter outputs.
Stratix® 10 devices have up to 48 fPLLs and 42 I/O PLLs in the largest densities devices.