tailieunhanh - Adaptive Techniques for Dynamic Processor Optimization_Theory and Practice Episode 2 Part 1

Tham khảo tài liệu 'adaptive techniques for dynamic processor optimization_theory and practice episode 2 part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 150 Alan Drake approximately equal. A critical path monitor located near high-power density circuits will track the temperature-induced timing changes of those circuits. The number of sensors is determined by the number of regions of high-power density on the integrated circuit. Supply voltage 19 31 variation has a much shorter time constant. The initial depth of a voltage droop AV is determined by the effective decoupling capacitance Cdc and the amount of current drawn I over a time period At as given by AV IAL. C The duration of the voltage droop is a function of the RLC characteristics of the power supply network and its ability to provide enough current to boost the power supply backup to its nominal value. In integrated circuits where decoupling capacitance is insufficient but a robust power supply distribution exists voltage droops will be large but short lived. Adding additional decoupling capacitance will slow down and reduce the amplitude of voltage droops. In a 65nm dual-core processor designed to test the performance of the power supply distribution large changes in the number of registers used in each cycle resulted in voltage droops around 150mV that lasted several nanoseconds. A voltage droop caused by activity changes in one core traveled to the second core on-chip in around 4ns where it was attenuated by the capacitive load of the second core. A large droop in both cores at simultaneous moments caused a large drop in the overall supply voltage 19 . Because power supply droop travels from where the current draw is highest to other parts of the integrated circuit relatively few critical path monitors are needed to detect them as even a single critical path monitor will eventually see the attenuated supply droop. Of more importance is how soon after its occurrence the droop needs to be detected. In DVFS systems that track the supply noise more critical path monitors will be needed and they will need to be located close to the circuits most .

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