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.
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
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.
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
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:
- 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 |
ACEC
