By Rakesh Chadha
This booklet offers a useful primer at the suggestions used in the layout of low energy electronic semiconductor units. Readers will enjoy the hands-on technique which begins shape the ground-up, explaining with easy examples what energy 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 structure (UPF) and customary strength layout (CPF) to explain intimately the ability rationale for an ASIC after which advisor readers via various architectural and implementation strategies that may aid meet the ability reason. From reading process strength intake, to options that may be hired in a low energy layout, to an in depth description of 2 exchange criteria for shooting the ability directives at quite a few stages of the layout, this ebook is full of details that might 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
Similar to the case described in previous subsection, the power dissipated in the IO is different from the power sourced by the VDDQ supply of the IO buffer. Similar to the output mode, the power description in the Liberty models is normally not adequate for accurate power analysis in input mode also. The dissipated power can be computed for steady state condition (output high or low) based upon the power supply VDDQ, input termination resistance, and the output drive impedance of the driver. Detailed SPICE level analysis is generally required to obtain the power dissipated in the specific configuration based upon the frequency of operation and the activity within the IOs.
Thus, for the given input transition time and output load, the power supply current waveform as a function of time is available. Additional lookup tables for other combinations of input transition time and output capacitance are also specified. Power supply current for other scenarios are also described similarly. 09e-04”); } . . } . . } . . } One major advantage of using current based models is that these are usable for dynamic power supply simulations to estimate power supply transient noise based upon the activity and the decoupling capacitances present in the system.
1 Static Probability For a given net, the static probability refers to the expected state of the signal. 2 implies that the signal is at logic-1 for 20% R. Chadha and J. 1007/978-1-4614-4271-4_4, © Springer Science+Business Media New York 2013 45 46 4 Power Analysis in ASICs of the time (and logic-0 for 80% of time1). 5 (or the clock is logic-0 for 50% of time and logic-1 for 50% of time). 2 Transition Rate The transition rate is the number of transitions per unit time. The transition rate is also referred to as toggle rate.