Altera DQ (ALTDQ) - Manual

November 2010 Altera Corporation
UG-MF9304-3.2 User Guide
Subscribe
© 2010 Altera Corporation. All rights reserved. ALTERA, ARRIA, CYCLONE, HARDCOPY, MAX, MEGACORE, NIOS,
QUARTUS and STRATIX are Reg. U.S. Pat. & Tm. Off. and/or trademarks of Altera Corporation in the U.S. and other countries.
All other trademarks and service marks are the property of their respective holders as described at
www.altera.com/common/legal.html . 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.
101 Innovation Drive
San Jose, CA 95134
www.altera.com
DQ (ALTDQ) and DQS (ALTDQS)
Megafunctions
Introduction
The Quartus ® II software provides parameterizable megafunctions ranging from simple
arithmetic units, such as adders and counters, to advanced phase-locked loop (PLL) blocks,
multipliers, and memory structures. These megafunctions are performance-optimized for
Altera devices and therefore provide more efficient logic synthesis and device
implementation, because they automate the coding process and save valuable design time.
You should use these functions during design implementation so you can consistently meet
your design goals.
General Description
This user guide discusses the following topics:
■ General features of the ALTDQ and ALTDQS megafunctions
■ Parameterization of the ALTDQ and ALTDQS megafunctions through the MegaWizard ™
Plug-In Manager
■ Port and parameter definitions of the ALTDQ and ALTDQS megafunctions
The ALTDQ and ALTDQS megafunctions allow you to control the functionality of the DDR
I/O pins for each of the device families. Most of the features of the megafunction map
directly into features of the I/O element (IOE) for each device family. For Cyclone
® II devices
that do not have DDR I/O registers in the IOE, the features are implemented in logic cells.
The ALTDQ and ALTDQS megafunctions are provided in the Quartus II software
MegaWizard Plug-In Manager. You can configure the DQ and DQS pins as input, output, or
bidirectional DDR pins on all the I/O banks of the device, depending on the specific custom
external memory interface requirements. Both DQ and DQS are bidirectional (the same
signals are used for both writes and reads). A group of DQ pins is associated with one DQS
pin. Use the ALTDQ and ALTDQS megafunctions to configure the DQ and DQS paths,
respectively.
Device Family Support
The ALTDQ and ALTDQ_DQS megafunctions support the following Altera ® device families:
■ Arria ® GX
■ Cyclone II
■ Cyclone III
■ Cyclone IV GX
■ HardCopy ® II