Sharp DV-SV97H Service Manual ▷ View online
2.11 Memory
2.11.1 System SRAM Interface
2.11.1 System SRAM Interface
The system SRAM interface controls access to optional external SRAM, which can be
used for RISC code, stack, and data. The SRAM bus supports four independent address
spaces, each having programmable bus width and wait states. The interface can support
not only SRAM, ROM/EPROM and memory-mapped I/O ports for standalone applications
are also supported
used for RISC code, stack, and data. The SRAM bus supports four independent address
spaces, each having programmable bus width and wait states. The interface can support
not only SRAM, ROM/EPROM and memory-mapped I/O ports for standalone applications
are also supported
.
2.11.2 Front Panel
The front panel is based around an VFD and a common NEC (or compatible) front panel
controller chip, (uPD16311). The V778 controls the uPD16311 using several control
signals, (clock, data, chip select). The infrared remote control signal is passed directly to
the
V778 for decoding.
controller chip, (uPD16311). The V778 controls the uPD16311 using several control
signals, (clock, data, chip select). The infrared remote control signal is passed directly to
the
V778 for decoding.
2.11.3 Back Panel
A typical rear panel is included in the reference design. This rear panel supports:
- two channel audio outputs
- Optical and coax S/PDIF outputs.
- Composite, SCART outputs
-Progressive and hdmi outputs
The video signals used to provide CVBS and RGB are generated by the V778’s
internal video DAC. The video signals are buffered by external circuitry.
Two channel audio output are in the form of I2S (or similar) data streams. The
S/PDIF serial stream is also generated by the V778 output by the rear panel. One Audio DAC
is used for two channel audio output with V778.
- two channel audio outputs
- Optical and coax S/PDIF outputs.
- Composite, SCART outputs
-Progressive and hdmi outputs
The video signals used to provide CVBS and RGB are generated by the V778’s
internal video DAC. The video signals are buffered by external circuitry.
Two channel audio output are in the form of I2S (or similar) data streams. The
S/PDIF serial stream is also generated by the V778 output by the rear panel. One Audio DAC
is used for two channel audio output with V778.
3. System Block Diagram
Table 1 – Vaddis 778 Pinouts
Pin
Number Pin Functions Direction Description
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