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DIFFCLK_1N Cyclone III Device Handbook
Prototype PCB
Part No.:   DIFFCLK_1N
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Description:   Cyclone III Device Handbook
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5. Clock Networks and PLLs in the
Cyclone III Device Family
July 2012
CIII51006-4.1
CIII51006-4.1
This chapter describes the hierarchical clock networks and phase-locked loops (PLLs)
with advanced features in the Cyclone
®
III device family (Cyclone III and
Cyclone III LS devices).
This chapter includes the following sections:
Clock Networks
The Cyclone III device family provides up to 16 dedicated clock pins (CLK[15..0])
that can drive the global clocks (GCLKs). The Cyclone III device family supports four
dedicated clock pins on each side of the device except EP3C5 and EP3C10 devices.
EP3C5 and EP3C10 devices only support four dedicated clock pins on the left and
right sides of the device.
f
For more information about the number of GCLK networks in each device density,
refer to the
chapter.
GCLK Network
GCLKs drive throughout the entire device, feeding all device quadrants. All resources
in the device (I/O elements, logic array blocks (LABs), dedicated multiplier blocks,
and M9K memory blocks) can use GCLKs as clock sources. Use these clock network
resources for control signals, such as clock enables and clears fed by an external pin.
Internal logic can also drive GCLKs for internally generated GCLKs and
asynchronous clears, clock enables, or other control signals with high fan-out.
© 2012 Altera Corporation. All rights reserved. ALTERA, ARRIA, CYCLONE, HARDCOPY, MAX, MEGACORE, NIOS, QUARTUS and STRATIX words and logos
are trademarks of Altera Corporation and registered in the U.S. Patent and Trademark Office and in other countries. All other words and logos identified as
trademarks or service marks are the property of their respective holders as described at
Altera warrants performance of its
semiconductor products to current specifications in accordance with Altera's standard warranty, but reserves the right to make changes to any products and
services at any time without notice. Altera assumes no responsibility or liability arising out of the application or use of any information, product, or service
described herein except as expressly agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device specifications before relying
on any published information and before placing orders for products or services.
Cyclone III Device Handbook
Volume 1
July 2012
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