A circuit and method for supporting network access wake-up

Abstract

The invention relates to a circuit and method for supporting network access wake-up, belonging to the field of electricity. The circuit includes a comparator and a small-scale FPGA chip, and the FPGA chip includes an oscillator and a counter; the input end of the comparator is connected to the main system RJ45 Network interface, capable of receiving incoming fast connection pulses from the outside; the output of the comparator is connected to the first input of the counter as the clock input of the counter, the oscillator is used as the counting window, and the output of the oscillator is connected to the second input of the counter terminal is used as the reset input of the counter, the output terminal of the counter is connected to the main system, the overflow output of the counter is connected to the power supply enable of the main system, and the overflow signal is also used as the shutdown enable of the oscillator; the main system is to be woken up equipment. The circuit of the invention can realize ultra-low sleep power consumption, the overall power consumption is not more than 1mW, and has strong anti-interference performance, and can effectively avoid false wake-up by adjusting the counter threshold.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to a circuit and method for supporting network access wake-up. Background technique [0002] In marine applications, there is a need for high-speed communication between underwater devices and the water surface. The current options are mainly Ethernet and optical fiber. Ethernet communication is currently the most widely used and technically mature communication method. Especially under the same bandwidth requirements, Ethernet has many advantages compared with optical fiber, such as high reliability, low cost, and simple integration. While underwater equipment communicates via Ethernet, it is usually required that the equipment has the feature of low power consumption sleep. For the dormancy and wake-up operation of underwater equipment, if controlled by an additional wake-up signal line, the wake-up operation is naturally very simple; but in the case of limited connection r...

AI Technical Summary

Problems solved by technology

However, the power consumption of network physical layer chips is usually not low. Even in low power consumption mode, it will consume more than tens of mW of power consumption. Such power consumption obviously cannot meet the sleep requirements of underwater equipment.

[0004] Therefore, in order to achieve a more thorough low-power sleep, it is necessary to power off the network physical layer chip; and there is still no solution to realize the automatic wake-up of the network access system when the overall system sleep power consumption is at the uW level.

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