Magic Blue Smoke

Archive for April 2007

 

RTL Implementation and Functional Verification of MV design – Part II

Now, if we look at the questions we had in the last blogpost, some are very design specific. Let me try to put across my view for the same.  RTL/Micro-Architecture requirements in detail (1) Some of the blocks will be shut-down. Does your design have control logic that generates signals locally to shut-down the block ? […]

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RTL Implementation and Functional Verification of MV design – Part I

Well, I was very very busy these days so could not catch up with my blog. Today let’s talk about RTL in a Mult-Voltage environment and it’s implication on verification. In  the earlier blogs we discussed MV design infrastructure. Today let’s look at ‘Power Gating’, the most common design style to reduce Leakage Power. Typical characteristics […]

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Posted in low power general | 9 Comments »

 

Special cells required for Multi-Voltage Design

As discussed in the previous session,  Special cells are required for implementing a Multi-Voltage design. Today lets discuss about these cells in brief. (1) Level Shifter (2) Isolation Cell (3) Enable Level Shifter (4) Retention Flops (5) AON cells (6) Power Gating Switches/MTCMOS switch (1) Level Shifter: Purpose of this cell is to shift the […]

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Posted in low power general | 4 Comments »

 

Infrastructure Needs for Multi-Voltage Designs

Before we start looking at implementing a Multi-Voltage design there are certain questions we need to find out from process/library perspective such as  Available Operating Voltages(PVT) Do we have special cells such as Level Shifters/Isolation cells/Power Gating Switches ? If Level Shifter exists, what kind of level shifters are available? (ex: Enable Level Shifter..etc) What […]

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Posted in Infrastructure | Comments Off on Infrastructure Needs for Multi-Voltage Designs

 

Let’s Talk about Multi-Voltage Magic

Last week at SNUG, there were so many tutorials on Low Power and everyone’s concerns/questions seems to be dancing around Multi-Voltage design. What I could sense was there were lot of designers Implementing Multi-Supply(Power-Gating) as opposed to real Multi-Voltage design. There are 3 classics style of new design style i found (1) Multi-Supply(Power Gating) (2) […]

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Low Power Galore at SNUG Sanjose

There are many papers presented at SNUG discussing about Low Power. Here is a link, which shows all the low power papers  (1) Power Integrity of the Design  (2) Exploration of Multi-Voltage Design   (3) Clock gating Success   (4) Decoupling Capacitance Estimation   (5) Low Power and High Performance   (6) Power Grid Analysis for IR Drop Problems […]

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Low Power Techniques in use Today

Lets take a look at various low power techniques in use today.I would classify the various low power techniques into 2 categories (a)Structural Techniques Voltage Islands Multi-threshold devices Multi-oxide devices Minimize capacitance by custom design Power efficient circuits Parallelism in micro-architecture (b)Traditional Techniques Clock gating Power gating Variable frequency Variable voltage supply Variable device threshold […]

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Posted in implementation | 10 Comments »

 

New Problem in the Block

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Posted in low power general | 2 Comments »

 

Low Power Standardization

Any design house implementing low-power ICs require a standard for describing low-power design requirements. To achieve the required power targets, design teams are increasingly adopting advanced power management techniques such as Multi-Voltage, Power Gating, Well biasing….etc. Such techniques if implemented quadruples design implementation effort and increase the risk equally. Given this the ideal way to […]

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