3.11 USB Circuit
This is USB circuit. This is standard USB1.1.
3.11.1 Gap/Black Mark sensor
1. The gap sensor is see-through sensor with 32 levels.
2. Black mark sensor is reflective sensor with 32 levels.
3. The GAP_ SENS signal is” HIGH“ when the gap sens detected gap; the BM_SENS
signal is “HIGH“ when the block mark sens detected block mark.
4. The gap sensor activates when GAP& Black mark SW signal is high; the black mark
sensor activates when GAP& BM_SW signal is low.
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