EP2C8T144I8N Datasheet, PDF (51/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Cyclone II Architecture
PLLs
Cyclone II PLLs provide general-purpose clocking as well as support for
the following features:
■ Clock multiplication and division
■ Phase shifting
■ Programmable duty cycle
■ Up to three internal clock outputs
■ One dedicated external clock output
■ Clock outputs for differential I/O support
■ Manual clock switchover
■ Gated lock signal
■ Three different clock feedback modes
■ Control signals
Cyclone II devices contain either two or four PLLs. Table 2–3 shows the
PLLs available for each Cyclone II device.
Table 2–3. Cyclone II Device PLL Availability
Device
EP2C5
EP2C8
EP2C15
EP2C20
EP2C35
EP2C50
EP2C70
PLL1
v
v
v
v
v
v
v
PLL2
v
v
v
v
v
v
v
PLL3
v
v
v
v
v
PLL4
v
v
v
v
v
Altera Corporation
February 2007
2–25
Cyclone II Device Handbook, Volume 1