tag: CPF

Power Mode And State
By Luke Lang - 12 Jul, 2012 - Comments: 0

By Luke Lang Low-power designs that use power shutoff (PSO) and multiple-supply voltage (MSV) will have circuits that operate at various voltages, including no voltage. To describe the combination of allowable voltages in a design, CPF uses power mode, and UPF 1.0 uses power state. In CPF, each power mode represents one combination of the states of all power domains. In UPF 1.0, each power ... » read more

LP Macros 2
By Luke Lang - 14 Jun, 2012 - Comments: 0

By Luke Lang Last month, I compared the CPF macro model with LP attributes in the Liberty model. The CPF macro model was developed when Liberty had very little LP attributes to support LP designs. Even today, Liberty still lacks LP attributes to describe some of the common power intent in LP designs. One example is an LP IP block with internal power switches and shutoff domains. Because mos... » read more

Trading Off Power For Performance
By Ed Sperling - 08 Mar, 2012 - Comments: 0

By Pallab Chatterjee Integration of CODECS and graphics cores with new processor engines is proving to be a trouble spot for power optimization. Because these blocks are driven by performance and are high-duty-cycle components, the main focus has been to push the limit for process performance. These blocks still use most of the tricks identified by both UPF and CPF, including multi-phase ... » read more

Virtual LP
By Luke Lang - 09 Feb, 2012 - Comments: 0

By Luke Lang Several months ago, I introduced the concept of virtual domain in association with hierarchical CPF. It is a relatively simple concept with a concise definition. It is powerful and flexible in supporting large designs with complex power architecture and hierarchical power intent. However, to the UPF coders, virtual domain is sometimes a mystery. I hope this blog will clear up any ... » read more

A Brief History Of Power Formats
By Barry Pangrle - 09 Feb, 2012 - Comments: 0

Barry Pangrle A lot has happened in the industry in the way of power format standards over the past seven years. I’m going to attempt to hit on some of the highlights over that time period, especially with regards to the “Big 3” EDA vendors to hopefully put it all into better context for our readers. Early on, circa 2005, Mentor Graphics was working on a power format referred to as th... » read more

Status Report: Power-Aware Design Flow
By Ed Sperling - 12 Jan, 2012 - Comments: 0

By Ann Steffora Mutschler While the term “design flow” can be a moving target, there are some specific requirements for a low-power/power-aware tool flow. Looking at this from a high level, where is the industry today, and where is it headed? There are really two sides to power, which are almost like two sides of the same coin: power consumption and power integrity. And both of those ar... » read more

Power Gating And Power-Centric Programing
By Ed Sperling - 03 Nov, 2011 - Comments: 0

By Pallab Chatterjee SoC design has a number of techniques for power management. One of the more prevalent methods is to use power gating to turn on and off blocks based on applications being run, and mode controls. Power gating while being supported by the two major EDA power design flows, UPF and CPF, still has some implementation challenges. The flows have to make sure that the states of... » read more

Power Intent Formats: Isolation
By Luke Lang - 03 Nov, 2011 - Comments: 0

By Luke Lang Last month, I discussed power domain for all three power formats: CPF, UPF 1.0, and IEEE 1801. I mentioned isolation but mainly used it to explain power domain. This month’s blog will address isolation in detail. First, isolation cells are required at off-to-on domain crossings. When a domain is shut off, all of its output nets become undriven. If these floating nets drive direct... » read more

Power Intent Formats: Power Domain
By Luke Lang - 06 Oct, 2011 - Comments: 0

By Luke Lang Starting this month, I will be writing a series of blogs inspired by “Dueling Power Formats”. The article correctly points out that there are currently three power formats: CPF, UPF 1.0, and IEEE 1801. Some designers will find themselves in a position of having to choose a format. Others will need to work with both formats. Regardless of which position one is in, these LP desi... » read more

DFT: Essential For Power-Aware Test
By Ed Sperling - 18 Sep, 2011 - Comments: 0

By Ann Steffora Mutschler Power-aware test is a major manufacturing consideration due to the problems of increased power dissipation in various test modes, as well as test implications that come up with the usage of various low-power design technologies. Challenges for test engineers and test tool developers include understanding the various concerns associated with power-aware test, develo... » read more

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