Sony CDP-715 - IC Pin Functions: CXD2515 Q (cont.)

Serial data input, supplied from IC801 (master control)
Latch input, supplied from IC801 (master control)
Serial data transfer clock input, supplied from IC801 (master control)
Numbers of track counted signal output (Not used)
Digital power supply
Mirror signal output (Not used) :
Defect signal output (Not used)
Output to select spindle motor output filter (Not used)
Input signal to detect disc inner most track
Sled drive output