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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
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