Altera Clock Control Block IP Core - Manual (Page 5)

February 2014 Altera Corporation Clock Control Block (ALTCLKCTRL) Megafunction
User Guide
1. About this Megafunction
The clock control block (ALTCLKCTRL) megafunction is a clock control function
provided by the Quartus
® II MegaWizard ™ Plug-In Manager to easily configure the
clock control block in supported devices.
The common applications of using this megafunction are as follows:
■ Dynamic clock source selection—When using the clock control block, you can
select the dynamic clock source that drives the global clock network. However,
only certain combinations of signal sources are supported, as described in
“Global
Clock Control Block” on page 3–2 . You cannot select clock sources dynamically to
drive the regional clock networks and the dedicated external clock-out path.
■ Dynamic power-down of a clock network—The dynamic clock enable or disable
feature allows internal logic to power-down the clock network. When a clock
network is powered-down, all the logic fed by that clock network is not toggling,
thus the overall power consumption of the device is reduced.
Features
The ALTCLKCTRL megafunction provides the following additional features:
■ Supports specification of operation mode of the clock control block
■ Supports specification of the number of input clock sources
■ Provides an active high clock enable control input
Device Support
The ALTCLKCTRL megafunction is available for the following devices:
■ Arria ® II GX
■ Arria II GZ
■ Arria V
■ Arria V GZ
■ Arria 10
■ Cyclone ® III
■ Cyclone III LS
■ Cyclone IV E
■ Cyclone IV GX
■ Cyclone V
■ Stratix ® III
■ Stratix IV
■ Stratix V