An ASIC Low Power Primer: Analysis, Techniques and by Rakesh Chadha

By Rakesh Chadha

This ebook offers a useful primer at the thoughts used in the layout of low energy electronic semiconductor units. Readers will enjoy the hands-on process which begins shape the ground-up, explaining with simple examples what energy is, the way it is measured and the way it affects at the layout means of application-specific built-in circuits (ASICs). The authors use either the Unified energy structure (UPF) and customary energy layout (CPF) to explain intimately the facility motive for an ASIC after which consultant readers via quite a few architectural and implementation thoughts that would aid meet the ability rationale. From examining procedure strength intake, to ideas that may be hired in a low energy layout, to an in depth description of 2 trade criteria for shooting the facility directives at a number of stages of the layout, this booklet is stuffed with info that might provide ASIC designers a aggressive facet in low-power design.

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Extra resources for An ASIC Low Power Primer: Analysis, Techniques and Specification

Example text

The IO power is sourced from core as well as IO power supplies. 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.

090”); } } } } This example shows the power specification for the CLK pin toggles described within two when-conditions. Q)”) represents the case when the output Q is the same as D and thus the clock does not cause any change in the state of the flip-flop. The internal power in this case is essentially the power due to clock inverter (within the flip-flop) switching when the clock switches. D&Q)”) represents the case when the clock results in a change in state of the flip-flop. The internal power in this case is only for the inactive clock edge (in this case, the falling edge of the clock).

0”); } } } The power dissipation tables illustrate that the clock input transitions for the memory read or write operations result in a much higher power dissipation in the memory macro than the activity of other inputs. During the read operation, the output bus Q also switches which results in internal switching as well as output charging power. The internal switching power for the output bus Q is depicted next. 022”); } } } } Note that the output charging power for the output Q bus would depend upon the output capacitive load driven by the Q pins of the memory.

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