VESTEL DVD7200, Руководство по обслуживанию

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3
1.2 M
EMORY
1.2.1 SDRAM Memory Interface
The MT1389 E provides a glueless 16-bit interface to DRAM memory devices used as
OSD, MPEG stream and video buffer memory for a DVD player. The maximum amount of
memory supported is 16 MB of Synchronous DRAM (SDRAM). The memory interface is
configurable in depth to support 110-Mb addressing. The memory interface controls access to
both external SDRAM memories, which can be the sole unified external read/write memory acting
as program and data memory as well as various decoding and display buffers.
1.3 D
RIVE
I
NTERFACES
The MT1389 E supports the DV34 interface, and other RF and servo interfaces used by
many types of DVD loaders. These interfaces meet the specifications of many DVD loader
manufacturers.
1.4 F
RONT
P
ANEL
The front panel is based around an Futaba VFD and a common NEC front panel
controller chip, (PTC16311). The MT1389 E controls the PTC16311 using several control signals,
(clock, data, chip select). The infrared remote control signal is passed directly to the MT1389 E for
decoding.
1.5 R
EAR
P
ANEL
A typical rear panel is included in the reference design. This rear panel supports:
- Six channel or two channel audio outputs
- Optical and coax S/PDIF outputs.
- Composite, and SCART outputs
The four-video signals used to provide CVBS, and RGB are generated by the MT1389 E ’s internal
video DAC. The video signals are buffered by external circuitry.
Six channel audio output by the MT1389 E in the form of three I
2
S (or similar) data streams. The
S/PDIF serial stream is also generated by the MT1389 E output by the rear panel. The six channel
audio DACs (AK4356,CS4360, PCM1606) are used for six channel audio output with MT1389 E .