Sharp DV-SV97H Service Manual ▷ View online
4 Audio Interface
The ADP is the audio processing unit of the Vaddis 778. It is based on a 32 bits data and 32
bits instruction ADP76 core. The ADP core has attached to it 24 KWords (32 bits) instruction
ROM, 2 banks of 8 KWords (32 bits) each of data ROM, 6 KWords (32 bits) instruction RAM,
8 KWords (32 bits) data RAM, 1 KWords (32 bits) data DMA caches, and several peripheral
units mentioned below, including units to assist JPEG decoding.
bits instruction ADP76 core. The ADP core has attached to it 24 KWords (32 bits) instruction
ROM, 2 banks of 8 KWords (32 bits) each of data ROM, 6 KWords (32 bits) instruction RAM,
8 KWords (32 bits) data RAM, 1 KWords (32 bits) data DMA caches, and several peripheral
units mentioned below, including units to assist JPEG decoding.
5 Audio Performance
DAC Resolution 24 Bit
DAC Sample Rate 192 KHz
DAC THD+Noise 100 dB
DAC Dynamic Range 92 dB
6 Video Interface
The VPU is responsible for all video output processing and timing. It outputs 8 bit (U, Y V, Y
interleaved) digital interlaced or progressive SD video with separate syncs and optionally
embedded syncs, or digital HD interlaced or progressive video. It can also output interlaced
composite, S- or component SD analog video, or progressive components SD analog video
interleaved) digital interlaced or progressive SD video with separate syncs and optionally
embedded syncs, or digital HD interlaced or progressive video. It can also output interlaced
composite, S- or component SD analog video, or progressive components SD analog video
7 SDRAM Memory
The V778 provides a glueless 16-bit interface to DRAM memory devices used as video
memory for a DVD player. Sharp SV97 uses 4mx16 SDRAM (6ns=166Mhz) as a video
memory.
memory for a DVD player. Sharp SV97 uses 4mx16 SDRAM (6ns=166Mhz) as a video
memory.
8 Flash Memory
.
The decoder board supports AMD class Flash memories. Sharp SV97 uses;
FLASH Macronix MX160lvcttc-70 16mbit.
-* V778 stores user settings on Flash memory, it doesn’t require an external EEPROM
-* V778 stores user settings on Flash memory, it doesn’t require an external EEPROM
9 Digital Servo Controller
The SERVO unit receive up to 8 analog signals from the RF amp device through the AFE after
external low pass filtering. The signals are converted to digital and transferred to a dedicated
programmable 16 bits DSP that perform the needed calculations for servo loop closing, closed
loop maintenance and reclosing when a loop is inadvertently opened. In addition to the analog
signals the SERVO unit receives DPLL rate and lock and defect indication from the DRC unit.
The servo loops handled are:
external low pass filtering. The signals are converted to digital and transferred to a dedicated
programmable 16 bits DSP that perform the needed calculations for servo loop closing, closed
loop maintenance and reclosing when a loop is inadvertently opened. In addition to the analog
signals the SERVO unit receives DPLL rate and lock and defect indication from the DRC unit.
The servo loops handled are:
-
Focus – Find and maintain focus
-
Spindle - Change and maintain speed to achieve constant linear velocity or bit-rate while the
radius is increasing along the spiral track
-
Sled - Rough radial position tracking and maintenance along the spiral track
-
Tracking - Fine radial position tracking and maintenance
The SERVO unit also contains two 11 bits DACs, and 9 PWMs of the high frequency
“uniform” type. The regular PWM circuits output can be used (through an external RC filter
and servo amplifier device) to feed the spindle and sled motors of the loader.
The second task of the SERVO unit is to perform, under DSP control, fast and accurate jumps
to a given track of the disc or to the BCA position (for DVD discs) across the spiral track, or to
change layers for two layers DVD discs.
The third task of the SERVO unit is to identify the disc type.
and servo amplifier device) to feed the spindle and sled motors of the loader.
The second task of the SERVO unit is to perform, under DSP control, fast and accurate jumps
to a given track of the disc or to the BCA position (for DVD discs) across the spiral track, or to
change layers for two layers DVD discs.
The third task of the SERVO unit is to identify the disc type.
10 VFD Controller
The VFD controller is a NEC uPD16311. This controller is not a processor, but does
include a simple state machine which scans the VFD and reads the front panel button
matrix. The
16311 also includes RAM so it can store the current state of all the VFD icons and
segments.
Therefore, the 16311 need only be accessed when the VFD status changes and when the
button
status is read. The V778 can control this chip directly using PIO pins or can allow the
front panel PIC to control the VFD
include a simple state machine which scans the VFD and reads the front panel button
matrix. The
16311 also includes RAM so it can store the current state of all the VFD icons and
segments.
Therefore, the 16311 need only be accessed when the VFD status changes and when the
button
status is read. The V778 can control this chip directly using PIO pins or can allow the
front panel PIC to control the VFD
.
11 Reset Circuitry
Sharp SV97 uses MAX809LTR SOT23 compatible RESET Ics.
Reset IC is connected to 5V line. In case of unstable power condition, reset IC resets the
software not to have an unwanted operation.
Reset IC is connected to 5V line. In case of unstable power condition, reset IC resets the
software not to have an unwanted operation.
12 Connectors
12.1 Loader Connectors
12.1 Loader Connectors
12.2 Scart Connectors
Some cheaper SCART cables use unshielded wires, which is just about acceptable for
short cable lengths. For longer lengths, shielded co-ax cable become essential.
short cable lengths. For longer lengths, shielded co-ax cable become essential.
Scart Signals:
Audio signals
0.5V RMS, <1K output impedance, >10K input impedance.
Red, Green, Blue
0.7Vpp
±2dB, 75R input and output impedance. Note that the Red connection (pin 20) can
alternatively carry the S-VHS Chrominance signal, which is 0.3V.
Composite Video / CSync
1Vpp including sync,
±2dB, 75R input and output impedance.Bandwidth = 25Hz to 4.8MHz
for normal TV Video de-emphasis to CCIR 405.1 (625-line TV)
Fast Blanking
75R input and output impedance. This control voltage allows devices to over-ride the
composite video input with RGB inputs, for example when inserting closed caption text. It
composite video input with RGB inputs, for example when inserting closed caption text. It
is called fast because this can be done at the same speeds as other video signals, which is
why it requires the same 75R impedances.
13
0 to 0.4V: TV is driven by the composite video input signal (pin 19).
why it requires the same 75R impedances.
13
0 to 0.4V: TV is driven by the composite video input signal (pin 19).
Left unconnected, it is pulled to 0V by its 75R termination.
1V to 3V: the TV is driven by the signals Red, Green, Blue and composite sync. The latter
1V to 3V: the TV is driven by the signals Red, Green, Blue and composite sync. The latter
is sent to the TV on pin 19. This signal is useful when using a TV to display the RGB output
of devices such as home computers with TV-compatible frame rates. Tying the signal to 5V
via 100R forms a potential divider with the 75R termination, holding the signal at around
of devices such as home computers with TV-compatible frame rates. Tying the signal to 5V
via 100R forms a potential divider with the 75R termination, holding the signal at around
2V. Alternatively, if a TTL level (0 to 5V) negative sync pulse is
available, this will be high during the display periods, so this can drive the blanking signal
via a suitable resistor.
available, this will be high during the display periods, so this can drive the blanking signal
via a suitable resistor.
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