The Unified Power Format (UPF) , officially known as IEEE Standard , was approved by the IEEE in December and will be. (Official IEEE P home page is here). Unified Power Format (UPF) is the popular name of the Institute of Electrical and Electronics Engineers (IEEE) standard. You learn about IEEE power supply networks, ground ports and nets, versions of UPF Debug design scenarios Analyze non-standard IEEE coding.
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Elements of that annotation include:. If you continue to use this site we will assume that you are happy with it. Users can each download a single copy of IEEE by providing an email address at the Get website. Add support for bottom up and top down design add documentation of the support for wildcard and regular expression selection of design instances clarify the differences between ports and pins provide for convergence capability from ieeee UPF and Common Power Format of the Silicon Integration Initiative Si2 The IEEE group was initially called the “Low Power Study Group”.
Unified Power Format – Wikipedia
Atomic power domains provide greater control for IP providers by preventing up from subdividing a domain so that the different parts are power-gated separately if that is not uppf supported by the IP.
Legacy commands are fine for existing modules but are not recommended for new design modules. Retrieved August 7, As a reaction to the Power Forward Initiative the group was proposed in July and met on September 13, Bailey was also chairman of the IEEE group. Attempting to create power domains inside an atomic domain will generate an error in compliant tools.
Guide to changes in IEEE (UPF )
As a language level, the command set has been structured to support successive refinement of power intent to reduce the usage overhead on design teams. Elements of that annotation include: Hard macros presented a problem for earlier versions of UPF if those macros implemented their own power-management ieef switchable power domains were the only way to define power supplies to domains that could be powered up and down.
The standard describes extensions to the Tool Command Language Tcl: The new version provides the ability to set power attributes on ports that are managed inside the macro.
Semantics for inferring additional elements in the design from the intent are provided in the standard. IEEE attempts to improve support for power modelling, implementation and verification throughout the lifecycle of an IC design. Where can I find it?
Latest version of IEEE 1801/UPF available for free
The current release is IEEE The emphasis of the latest version of the standard focuses on usability in industrial designs, restricting some of the freedom of the command set but providing better guidance for design teams trying to design ICs with complex power modes and behavior. A number of features have been added to better support design reuse and commercial IP, including the ability to set constraints on usage.
Proposed standards have the letter “P” in front of them such as Pwhich is removed and replaced with a dash and year when the standard is ratified. This strategy can be overridden for a named port on that domain, which in turn may be overridden by a command that specifies individual bits within a multibit port.
Retrieved July 7, The way in which UPF commands override each other is expressed through precedence rules.
jeee Views Read Edit View history. Digital designers, IP Block providers, Physical Designers, and Verification engineers make use of this standard language to communicate their design intent and implementation with respect to the variable power of an electronic system.
Several informative annexes have been added to the standards document, such as Annex E, which provides a low-power design methodology based on the standard, and Annex I, which provides examples of how to model power-management cells. Specific support for individual aspects of IEEE are currently unclear.
Retrieved July 6, Hardware iCE Stratix Virtex.
This page was last edited on 18 Novemberat Files written to this standard annotate an electric design with the power and power control intent of that design. In general, retention strategies influence repeater, isolation and level-shifter strategies in turn.
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Unified Power Format
A further addition is the concept of supply equivalence, in which supply nets can be treated as electrically or functionally equivalent to reduce the number of source and sink attributes that need to be defined. Equivalence can be overridden in scripts to provide greater control over strategies.
Deprecated commands should be replaced as soon as possible in current designs as future support cannot be guaranteed.
Changes in IEEE took advantage of industrial experience and a wider user base to perform a cleanup of the original standard, as well as adding new commands to support incremental specification of power modes and behavior.
An important underlying concept is that of incrementality, to allow the design to be gradually elaborated over time as more implementation detail is added without forcing engineering teams to keep rewriting the command scripts.
Instead, precedence rules are used to allow later, more detailed UPF commands to override generic commands that may have been inserted earlier to support behavioral logic simulation.