6. PWM_RL signal, output range is 4.0V, frequency is 384.0KHZ (fixed output does not change
with volume adjustment), waveform of two ends of R103
7. When in external input, main clock of TAS5508 (waveform diagram of pin 4 of N2)
8. Clock of 1389: when playing DVD, waveform of main clock of TAS5508
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