By Rakesh Chadha
This booklet presents a useful primer at the suggestions used in the layout of low energy electronic semiconductor units. Readers will enjoy the hands-on strategy which begins shape the ground-up, explaining with simple examples what strength is, the way it is measured and the way it affects at the layout technique of application-specific built-in circuits (ASICs). The authors use either the Unified strength layout (UPF) and customary energy layout (CPF) to explain intimately the ability reason for an ASIC after which advisor readers via various architectural and implementation thoughts that may aid meet the ability cause. From interpreting method energy intake, to thoughts that may be hired in a low energy layout, to an in depth description of 2 trade criteria for taking pictures the ability directives at quite a few levels of the layout, this e-book is stuffed with info that may supply ASIC designers a aggressive area in low-power design.
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Additional info for An ASIC Low Power Primer: Analysis, Techniques and Specification
The bidirectional IO power computation depends upon the portion of time the IO is in input mode versus the portion of time spent in output mode. g. such as DDR2/DDR3 IOs) generally use a terminated transmission line to reduce reflections. The parallel termination results in fixed DC power which is present even when the IO is not switching. Because of the parallel termination, the power dissipated within the IO buffer and the power supplied by the IO power supply are different. The next chapter deals with detailed power computation based upon the activity in the design.
Here is an example excerpt from the Liberty description of an input IO buffer. 64”); } The power model above is related to the CORE_VOLTAGE. In this example, no separate power models are specified for IO_VOLTAGE since the power dissipated from the IO power supply is considered to be negligible. Example Computation of Active Power. Consider an example of the input IO buffer in Fig. 3. 02 pF load at pin C. 5 ns. What is the total active (or dynamic) power dissipated in the input buffer for the core power supply?
Here is an example from a SerDes macro specification. 5mA AHVDD: 20mA VDD_CORE: 20µA The power dissipation normally depends upon various modes of operation. Examples of such modes are: low speed mode, high speed mode and power down mode. 3 Power Dissipation in IO Buffers In general, a significant portion of the power in a design is dissipated in the IO buffers. This is largely because in comparison to the core signals, the IO signals have a larger voltage swing and the outputs drive a large capacitive load.
An ASIC Low Power Primer: Analysis, Techniques and Specification by Rakesh Chadha