EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 86

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Memory Blocks in Cyclone III Devices
Conclusion
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Cyclone III Device Handbook, Volume 1
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Power-Up Conditions and Memory Initialization
The Cyclone III memory block outputs power up to zero (cleared)
regardless of whether the output registers are used or bypassed. All
memory blocks support initialization via a memory initialization file
(.mif) file. You can create .mifs in the Quartus II software and specify their
use via the RAM MegaWizard when instantiating memory in your
design. Even if memory is pre-initialized (via a .mif file, for example), it
still powers up with its outputs cleared. Only the subsequent read after
power up outputs the pre-initialized values.
For more information on MIF files, refer to the RAM Megafunction User
Guide as well as the Quartus II Handbook. You will find these documents
at the Altera web site at
http://www.altera.com/literature/ug/ug_ram.pdf and
http://www.altera.com/literature/lit-qts.jsp, respectively.
Power Management
Cyclone III memory block clock enables allow you to control clocking of
each memory block to reduce AC power consumption. Use the
read-enable signal to ensure that read operations only occur when
necessary. If your design does not require read-during-write, reduce
power consumption by de-asserting the read-enable signal during write
operations, or any period when there are no memory operations.
The Quartus II software automatically powers down any unused
memory blocks in order to save static power.
The Cyclone III M9K embedded memory structure provides flexible
memory architecture with high memory bandwidth. It addresses the
needs of different memory applications in Cyclone III device designs with
features such as different memory modes, byte enables, parity bit storage,
address clock enables, mixed clock mode, and mixed-port width support.
All these configurations are possible via the Quartus II MegaWizard.
Altera Corporation-Preliminary
March 2007