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EP2AGX125 Datasheet(PDF) 48 Page - Altera Corporation

Part # EP2AGX125
Description  Device Interfaces and Integration
Download  380 Pages
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP2AGX125 Datasheet(HTML) 48 Page - Altera Corporation

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2–18
Chapter 2: Logic Array Blocks and Adaptive Logic Modules in Arria II Devices
Document Revision History
Arria II Device Handbook Volume 1: Device Interfaces and Integration
December 2010
Altera Corporation
Clocks represent a significant portion of dynamic power consumption due to their
high switching activity and long paths. The LAB clock that distributes a clock
signal to registers within an LAB is a significant contributor to overall clock power
consumption. Each LAB’s clock and clock enable signal are linked. For example, a
combinational ALUT or register in a particular LAB using the labclk1 signal also
uses the labclkena1 signal. To disable an LAB-wide clock power consumption
without disabling the entire clock tree, use the LAB-wide clock enable to gate the
LAB-wide clock. The Quartus II software automatically promotes register-level
clock enable signals to the LAB-level. All registers within the LAB that share a
common clock and clock enable are controlled by a shared, gated clock. To take
advantage of these clock enables, use a clock-enable construct in your HDL code
for the registered logic.
f For more information about implementing static and dynamic power consumption
within the LAB, refer to the Power Optimization chapter in volume 2 of the Quartus II
Handbook.
Document Revision History
Table 2–1 lists the revision history for this document.
Table 2–1. Document Revision History
Date
Version
Changes
December 2010
2.0
Updated for the Quartus II software version 10.1 release:
Added Arria II GZ device information.
Updated “Logic Array Blocks”, “LAB Interconnects”, “LAB Control Signals”, “Adaptive
Logic Modules”, “ALM Operating Modes”, “Normal Mode” sections.
Added Figure 2–7 and Figure 2–8.
Added “LAB Power Management Techniques” section.
June 2009
1.1
Updated Figure 2–6.
February 2009
1.0
Initial Release.


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