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IC202 to IC601 Communications
Signal Active Signal Present when
Chip Select (CS1 or CS4) Low IC202 & IC205 gets Vcc
Clock IC202/pin 5 Low IC202 gets B+
Write IC202/pin 22 Low IC202 & IC205 gets Vcc
Six Address lines HA 0-5 IC202 gets B+
16 Data lines HD 0-15 IC202 gets B+
When IC601 wants to send reply data to IC202, an interrupt signal is sent
to IC202. When IC202 is ready, it will send chip select, clock, read pulses
and address to support the data received from IC601.
IC601 to IC202 Communications
Signal Active Signal Present when
Interrupt (INT1 or INT3) Low
An operation is completed
(e.g. sled moved)
Chip Select (CS1 or CS4) Low IC202 and IC205 gets Vcc
Clock IC202/pin 5 Low IC202 gets B+
Read IC202/pin 24 Low IC202 and IC205 gets Vcc
Six Address lines HA 0-5 IC202 gets B+
16 Data lines HD 0-15 IC202 gets B+
HGA IC601 to Servo IC701
Bi-directional communications between these two ICs is similar to that
described for IC202 and IC601. The differences are in the IC pin num-
bers and that IC601-IC701 communications are only taking place when a
servo command is changed.
IC601 to IC701 Communications
Signal Active Signal Present when
Chip Select (SDCPS
IC601/pin 118)
Low
Power on/off, Tray in/out,
disc playback
Clock Input IC701/pin 108 Low 3.3V is present
Write (SDPWR IC601/pin
116)
Low
Power on/off, Tray in/out,
disc playback
Two Address lines HA 0-1 IC202 gets Vcc
8 Data lines HD 0-7 IC202 gets Vcc
IC701 to IC601 Communications
Signal Active Signal Present when
Interrupt
HINT from
IC701/pin 128)
Low
An operation is completed
(e.g. sled moved)
Chip Select
SDCPS
from IC601/pin 118)
Low Power on/off
Tra
in/out
disc playback
Clock Input IC701/pin
108
Low 3.3V is present
Read from IC601/pin
117
Low
Power on/off
Tra
in/out
disc playback
Two Address lines HA
0-1
IC202 gets Vcc
8 Data lines HD 0-7 IC202 gets Vcc
