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Sharp GX-CD1200W GL Service Manual Page 26

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GX-CD1200W
IC802 VHiTC9457F0-1: Servo/Signal Control (TC9457F0) (3/4)
63 SBAD SBAD Input/Output Subbeam add signal input pin.
64 TEI TEI Input/Output Tracking error input pin.
This input is read when tracking servo is on.
65 TEZI TEZI Input/Output Tracking error zero-cross input pin.
66 FOO FOO Input/Output Focus equalizer output pin.
67 TRO TRO Input/Output Tracking equalizer output pin.
68 VREF VREF Input/Output Analog reference power supply pin.
69 RFGC RFGC Input/Output RF amplitude adjusting control signal output pin. It outputs 3-level PWM
signals. (PWM carrier = 88.2kHz)
70 TEBC TEBC Input/Output Tracking balance control signal output pin. It outputs 3-level PWM signals.
(PWM carrier = 88.2kHz)
71 FMO FMO Input/Output Focus equalizer output pin. It outputs 3-level PWM signals.
(PWM carrier = 88.2kHz)
72 DMO DMO Input/Output Disc equalizer output pin. It outputs 3-level PWM signals.
(PWM carrier = DSP block 88.2kHz, synchronized to PXO)
73 2VREF 2VREF Input/Output Analog reference power supply pin. (2 x VREF)
74 SEL SEL Input/Output APC circuit on/off signal output pin.
When laser is on, this pin goes to a high-impedance state when UHS = low
and outputs a high when UHS = high
75 VDD VDD2 Input/Output CD unit's digital block power supply pins.
76 VDD VSS2 Input/Output Normally, apply 5V to VDD.
When not using a CD (CD off), this power supply can be turned off, with
only the controller power supply kept active, so that the controller alone is
operating. In this case, the CD off bit must be set to 1. When this bit is set
to 1, pins 11 through 18 and pins 39 through 42 all are changed for output
ports if they have been set for CD control signal input/output pins.
77 XVSS XVSS Input/Output CD's crystal oscillator power supply pins.
Normally, connect these pins to the power supply lines that are used in
common for the VDD and VSS pins.
78 XI XI Input/Output CD's crystal oscillator input/output pins.
79 XO XO Input/Output Normally, connect 16.934MHz here. This clock is used as the system clock
for the CD. After a system reset, it also is used as the system clock on the
controller side.
80 XVDD XVDD Input/Output CD's crystal oscillator input/output pins.
Normally, connect these pins to the power supply lines that are used in
common for the VDD and VSS pins.
81 DVSR DVSR Input/Output R-channel D/A converter unit ground pin.
82 RO RO Input/Output R-channel data forward output pin.
83 DVRR DVRR Input/Output R-channel reference voltage pin.
84 DVDD DVDD Input/Output D/A converter unit power supply pin.
85 DVRL DVRL Input/Output L-channel reference voltage pin.
86 LO LO Input/Output L-channel data forward output pin.
87 DVSL DVSL Input/Output L-channel D/A converter unit ground pin.
88 NC NC Input/Output NC pins. Normally, connect these pins to ground or leave them open.
89* NC/VPP NC Input/Output
90 /RST RESET Input Device's system reset signal input pin.
The device remains reset while RESET is held low and when RESET is
released back high, the CD unit becomes operational and the program
starts from address 0. Normally, a system reset is asserted when a voltage
of 2.7V or more is applied to VDD when it is at 0V (power-on reset).
Therefore, this pin must be pulled high when used for this purpose.
Port Name Terminal NamePin No. Input/Output
In this unit, the terminal with asterisk mark (*) is open terminal which is not connected to the outside.
Function
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