電氣專業(yè)畢業(yè)設(shè)計(jì)外文文獻(xiàn)與中文翻譯-在線瀏覽
2025-02-04 04:41本頁(yè)面
【正文】 achieve this end, we can be static leakage management (SLM) technology, start the standby mode or turn off the device. These two models of a key difference is: In standby mode, the device is still occupied by the internal memory and logic, and in the closed mode of the device, all the system state is stored in external memory. The use of SLM technology, wakeup time much faster than the speed of cold start because the procedures have been loaded into the external memory, the user having to wait for the operating system (OS) pletely restarted. In the case of the use of SLM technology, we media player as an example, if after ten seconds to open has not been processing instruction or user input, it will close the display device to enter standby or shut down mode. For example, TI using ARM CortexA8 core OMAP35x devices on a single chip processor to support the device shut down mode, the device can automatically wakeup call that the lowest power mode. In addition to wakeup domain, all power domain are closed, power consumption, only to wake up the domain with the I / O leakage current. Shut down the system clock, in the circumstances, the wakeup clock domain by a separate set of 32 kHz. In addition, OMAP35x can automatically send signals to external regulators, voltage regulators can shut down the depth of sleep. Processor does not save the internal memory or logic. In the electric mode into the device before the closure, the system state is stored in external memory. After the wakeup reset, the microprocessor unit (MPU) will activate the userdefined functions, SDRAM controller configuration from the highspeed temporary memory (SPM) to recover. To meet a variety of uses of technology Through a bination of the abovementioned power management technology, we can be a wide range of operating conditions to achieve the best power. If the system was busy dealing with highresolution video playback for portable players such as tasks, then set up in overvoltage VDD1 on OPP. If it is a moderatepower web browsing, can be set for VDD1 and VDD2 rated the OPP. If lowpower music can be set for VDD1 and VDD2 lowest OPP. In all these circumstances, we can start the AVS to balance the cold hot power differential devices. Finally, if users open the media player but not a few hours or a few days use, its adoption of SLM technology will automatically shut down the device into the model. To better understand the use of technology brought about by the abovementioned energysaving advantages, the following cases need to be taken into account. In the following cases, unless there are specific description, or we all do not use TI39。s operating frequency is 90 MHz, in the processing cycle without entering the low power mode to reduce power consumption. At this time, VDD1 V, VDD2 volts to 1. Case four: audio / video encoding 540 mW (nonDPLL power and IO). In that case, we capture and encode audio (AACe +, 48 kHz, 32k bps stereo), video capture and encoding ( VGA resolution, 20 frames per second, Mbsp), audio and video are preserved, At the same time to display video. In the configurat
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