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EP3C10U256C6N Datasheet, PDF (52/274 Pages) Altera Corporation – Cyclone III Device Family Overview | |||
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3â18
Chapter 3: Memory Blocks in the Cyclone III Device Family
Document Revision History
Power-Up Conditions and Memory Initialization
The M9K memory block outputs of the Cyclone III device family power up to zero
(cleared) regardless of whether the output registers are used or bypassed. All M9K
memory blocks support initialization using a .mif. You can create .mifs in the
Quartus II software and specify their use using the RAM MegaWizard Plug-In
Manager when instantiating memory in your design. Even if memory is
pre-initialized (for example, using a .mif), it still powers up with its outputs cleared.
Only the subsequent read after power up outputs the pre-initialized values.
f For more information about .mifs, refer to the Internal Memory (RAM and ROM) User
Guide and the Quartus II Handbook.
Power Management
The M9K memory block clock enables of the Cyclone III device family allow you to
control clocking of each M9K memory block to reduce AC power consumption. Use
the rden signal to ensure that read operations only occur when necessary. If your
design does not require read-during-write, reduce power consumption by deasserting
the rden signal during write operations, or any period when there are no memory
operations. The Quartus II software automatically powers down any unused M9K
memory blocks to save static power.
Document Revision History
Table 3â6 lists the revision history for this document.
Table 3â6. Document Revision History
Date
December 2011
December 2009
July 2009
June 2009
October 2008
May 2008
July 2007
March 2007
Version
Changes
2.3 Minor text edits.
2.2 Minor changes to the text.
2.1 Made minor correction to the part number.
Updated to include Cyclone III LS information
â Updated chapter part number.
â Updated âIntroductionâ on page 3â1.
â Updated âOverviewâ on page 3â1.
2.0 â Updated Table 3â1 on page 3â2.
â Updated âControl Signalsâ on page 3â3.
â Updated âMemory Modesâ on page 3â8.
â Updated âSimple Dual-Port Modeâ on page 3â10.
â Updated âRead or Write Clock Modeâ on page 3â16.
1.3 Updated chapter to new template.
â Revised the maximum performance of the M9K blocks to 315 MHz in âIntroductionâ and
1.2
âOverviewâ sections, and in Table 3-1.
â Updated âAddress Clock Enable Supportâ section.
1.1 Added chapter TOC and âReferenced Documentsâ section.
1.0 Initial release.
Cyclone III Device Handbook
Volume 1
December 2011 Altera Corporation
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