4 M0 I Left/right channel digital audio gating signal M0
5 SDATA0 I Left/right channel digital audio signal input R29
6 SDA LR O Left/right channel digital audio signal output R101
7 GND P Ground Ground
8 SDA SLSR O Surround left/right channel digital audio signal output
R100
9 SDATA1 I Surround left/right channel digital audio signal input
R56
10 M0 I Surround left/right channel digital audio gating signal
M0
11 SDA CSW O Centre subwoofer digital audio signal output R98
12 SDATA2 I Centre subwoofer digital audio signal input R59
13 M0 I Centre subwoofer digital audio gating signal M0
14 VCC P 3.3V power supply Power supply
3. Pin function of N4 (74HCT125) is shown as the following table:
Pin Contiguous signal name
Data direction
Function description Directly contiguous element or signal
1 M0 I External clock gating signal M0
2 SACLK I External clock signal input SACLK
3 MCLK O External clock signal output R70
4 M0 I Bit clock gating signal M0
5 SBCLK I Bit clock signal input SBCLK
6 SCLK O Bit clock signal output R97
7 GND P Ground Ground
8 LRCK O Left/right channel clock signal output
R96
9 SLRCK I Left/right channel clock signal input SLRCK
10 M0 I Left/right channel clock gating signal
M0
11 SDA AD O External digital audio signal output
R99
12 SDA I External digital audio signal input R225
13 M1 I External digital audio gating signal
M1
14 VCC P 3.3V power supply Power supply
4. Through the gating to 74HCT125, M0, M1 signal outputted from MT1389 realize the selection to
internal and external signal. The function table is shown as follows:
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