LG CRD-8480M, Service Manual

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16
95 CASH_
/ RWEH_
TTL Output
Slew rate
Column Address Strobe High / RAM Write Enable High. When a
16-bit DRAM is used, this pin functions as Column address Strobe
High for accessing the upper bytes of a two-CAS_ DRAM if
TWE63h.RW6 is 0, or as Write Enable High for writing the upper
bytes of a two-WE_ DRAM.
output 3.3V
96
RWE_
/ RWEL_
TTL Output RAM Write Enable / RAM Write Enable Low. When TWE63h.RW6
is 0 or when an 8-bit DRAM is used, this pin is the active-low write
strobe to the external buffer DRAM. When TWE63h.RW6 is 1, this
pin is the Write Enable Low signal for writing the lower bytes of a
two-WE_ 16-bit DRAM.
output 3.3V
97
RAS_
TTL Output
Slew rate
Row Address Strobe.
This output is the Row Address Strobe signal to the buffer DRAM.
output 3.3V
98 DVDD3 Power(3.3V) 3.3V power pin for digital circuitry.
99~103
105~108
RA[8:0] TTL I/O, Slew rate
50K pull_down
Buffer RAM Address.
These pins are the address bus to the external buffer DRAM.
output 3.3V
104 DGND Ground Ground pin for internal digital circuitry.
Audio Interface
117 ADGO
/ VIO0
TTL I/O, Slew rate
SMT, 50K pull_up
Digital Audio Output / Versatile I/O 0. The signal is either the Digital
Audio Output which supplies the IEC-958 digital audio data when
A0SEL00h.RW7=1 and ADOE2Eh.RW0=1, or the Versatile I/O 0
pin otherwise.
Internal Audio DAC Interface
109 DACVSS Ground Ground pin for internal DAC circuitry.
110 RO Analog Output Right channel of audio.
111 DACVREF Analog Output Reference voltage for external audio filter circuit.
112 LO Analog Output Left channel of audio.
113 DACVDD Analog
Power(3.3V)
Power pin for internal DAC circuitry.
Varipitch VCO Interface
114 VPVDD Analog
power(3.3V)
Power pin for varipitch VCO circuitry.
115 VCOCIN Analog Input Connect capacitor for compensator loop filter.
116 VPVSS Ground Ground pin for varipitch VCO circuitry.
Host Interface
118 DEVSEL TTL Input
50K pull_up
Device Select. Cleared to zero indicates the MT1199 is master
device. Set to one indicates the MT1199 is slave device.
119 DASP_ TTL I/O
50K pull_up
Device Active / Device 1 Present. This is a time-multiplexed signal
which indicates that a device is active, or that Device 1 is present. A
10K-ohm pull-up resistor shall be connected to this signal
externally.