Samsung SV-DVD50 Service Manual page 153

(3) Waveform Description
It measures the timing that data processed in SIC1 at DVD playback.
CH1
CH2
CH3
CH4
• CH1 : STROBE (SIC1-123, CLOCK)
• CH2 : REQ (SIC1-124, DATA REQUEST)
• CH3 : DACK (SIC1-125, DATA ACKNOWLEDGE)
• CH4 : SDATA (SIC1-126~133, SDATA)
Fig. 7-47
Circuit Operating Descriptions
7-51