Equalizer adaptive state machine deadlock avoidance method

Abstract

An equalizer adaptive state machine deadlock avoidance method relates to the integrated circuit technology, and comprises the following steps: 1) reading the current link state; 2) waiting for a preset time length; (3) inquiring and judging: a, judging whether a non-in-place warning exists or not, if so, judging that A = 1, and if not, judging that A = 0; b, judging whether an LOS warning exists or not, if so, judging that B = 1, and if not, judging that B = 0; c, judging whether a service alarm is given or not, if so, judging that C = 1, and if not, judging that C = 0; entering subsequent steps according to conditions; 4) judging whether the last link state is link down or not; 5) restarting the state machine, setting the link state as link up, and then ending; 6) judging whether the lastlink state is link up or not; and 7) stopping the state machine, setting the link state to be link down, and then ending. According to the invention, the self-adaptive state machine of the equalizercan be prevented from entering the deadlock state due to reasons such as abnormal received signals and the like in time.

Description

technical field [0001] The present invention relates to integrated circuit technology. Background technique [0002] The equalizer (Equalizer, referred to as EQ) is a circuit that can adjust the signal amplification of different frequency components separately. By compensating the signals of different frequencies in different sizes, it can compensate the channel's different effects on the high frequency, intermediate frequency and low frequency of the signal. Attenuation. [0003] Continuous time linear equalization (CTLE for short) and decision feedback equalizer (DFE for short) are two circuit implementations of equalizers at the receiving end. [0004] There are usually two ways to adjust the equalizer parameters: fixed configuration value and adaptive configuration. [0005] When an adaptive configuration is adopted, the adaptive state machine can be a logic state machine solidified as a digital circuit, or a logic state machine that can be modified by software control...

AI Technical Summary

Problems solved by technology

[0017] When signal loss, short circuit to DC level, and other abnormal conditions occur, the adaptive algorithm cannot obtain the expected signal quality no matter whether the equalizer parameters are adjusted up or down, and the equalizer parameters may be adjusted to extreme values ​​​​and cannot be recovered

[0018] When the signal returns to normal, because the equalizer adaptive state machine is still in a deadlock state (or called a hang state), the communication service cannot return to normal

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