LG CRD-8483B Service Manual page 22

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Pin No.
Symbol
115
DMARQ
116~121,
DD[15:0]
123~129,
131~133
DGND
122
DVDD
130
Reset Interface
HRST_
134
POR
147
IPLL VCO Interface
IPLLVDD
135
IPLLVSS
136
Extended GPIO Interface
IO[8:5]
17~20
37
IO4/CS
145
IO0
IO1
146
Mega Interface
21
LED
22
EJECT_
PLAY_
23
DGND
137
TRAYIN_
138
139
TRAYOUT_
140
TROPEN
141
TRCLOSE
142
LIMIT_
143
DVDD3
144
DGND
Motor and Actuator Driver Interface
148
FG
LDC
149
FMO
150
20
Type
Description
TTL Output
DMA Request. This signal, used for DMA data transfer, is asserted by the
MT1198 when it is ready to transfer data to or from the host.
TTL I/O pull_up/
Device Data. This is the 8-bit or 16-bit bi-directional data bus to the host.
pull_down
The lower 8 bits, DD0-DD7, are used for 8-bit data transfers.
Note : All pins except DD7 may be selectively pull up/down with 20k
resistant.
Ground
Ground pin for internal digital circuitry.
Power(5V)
Power pin for internal digital circuitry.
TTL Input, SMT
Host reset input. The active low input is used to reset MT1198.
TTL Input, SMT
Power on reset input, active high.
Analog power(5V)
Power pin for IPLL VCO circuitry.
Ground
Ground pin for IPLL VCO circuitry.
TTL I/O, Slew rate
Programmable GPIO.
50Kpull_up
TTL I/O
Programmable GPIO.
50K pull_up
Alternate function : Chip select signal for flash ROM selection, active low.
TTL I/O
Programmable bi-directional I/O.
50K pull_down
Alternate function : Serial bus reserved for MT1136.
TTL I/O
Programmable bi-directional I/O.
50K pull_up
Alternate function : Serial bus reserved for MT1136.
TTL Output
LED control output. Controlled by µP.
TTL Input
Eject/stop key input, active low.
TTL Input
Play/pause key input, active low.
Ground
Ground pin for internal digital circuitry.
TTL Input
Tray_is_in input. A logical low indicates the tray is in. Feedback flag from
tray connector.
TTL Output
Tray_is_out input. A logical low indicates the tray is out. Feedback flag
from tray connector.
TTL Output
Tray open output. Controlled by µP.
TTL Output
Tray close output. Controlled by µP.
TTL Input
Sledge inner limit input, active low.
Power(3.3V)
Power pin for internal digital circuitry.
Ground
Ground pin for internal digital circuitry.
TTL Input, SMT
Motor Hall sensor input.
50K pull_up
TTL Output
Laser diode control. A logical high enables laser diode.
Analog Output
Feed motor control. PWM output.
Alternate function : Programming PWM output. For stepping motor
(sledge) application.

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