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DIFFCLK_4P Cyclone III Device Handbook
Prototype PCB
Part No.:   DIFFCLK_4P
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Description:   Cyclone III Device Handbook
File Size :   7302 K    
Page : 274 Pages
Maker   ALTERA [ ALTERA CORPORATION ]http://www.altera.com
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3. Memory Blocks in the Cyclone III
Device Family
December 2011
The Cyclone
III device family (Cyclone III and Cyclone III LS devices) features
embedded memory structures to address the on-chip memory needs of Altera
Cyclone III device family designs. The embedded memory structure consists of
columns of M9K memory blocks that you can configure to provide various memory
functions, such as RAM, shift registers, ROM, and FIFO buffers.
This chapter contains the following sections:
M9K blocks support the following features:
8,192 memory bits per block (9,216 bits per block including parity)
Independent read-enable (rden) and write-enable (wren) signals for each port
Packed mode in which the M9K memory block is split into two 4.5 K single-port
Variable port configurations
Single-port and simple dual-port modes support for all port widths
True dual-port (one read and one write, two reads, or two writes) operation
Byte enables for data input masking during writes
Two clock-enable control signals for each port (port A and port B)
Initialization file to pre-load memory content in RAM and ROM modes
© 2011 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
December 2011
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