Samsung SV-DVD50 Service Manual page 146

Circuit Operating Descriptions
(3) Waveform Description
When micom accesses each device sharing bus, it falls the chip select signal of corresponding chip to
(/dspcs : ZIC1-123, /FLASH DSP : ZIC1-126, /DSPCS : DIC1-2, /DVD1CS : ZIC1-208, CSB : SIC1-10)
0 (Low) before trial.
So to speak, the bus is used by time-division as shown in Fig. 7-41.
Two and more devices can't be accessed simultaneously.
CH1
CH2
CH3
CH4
• CH1 : /DSPCS (ZIC1-123, DSP CHIP SELECT)
• CH2 : /FLASHCS (ZIC1-126, FLASH CHIP SELECT)
• CH3 : /WR 9ZIC1-129, MICOM OUTPUT WRITE SIGNAL)
• CH4 : /RD (ZIC1-128, MICOM OUTPUT READ SIGNAL)
7-44
Fig. 7-41 Servo Chip Access