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• Bit 3 &2: not used
• Bit 1 & 0: Status Scart-1/Pin8:
– 0 1 Low-level
– 1 0 Medium-level (16:9)
– 1 1 High-level (4:3)
Pin-16 (Fast Blank):
Only the status/level of Scart-2/Pin16 must be detected;
this is realised by using PortC3/AIN14 (Pin25) of the CC-C
as an Analogue-input.
• ADC-value lower or equal 24h ( Pin16 low (no RGB-
signals)
• ADC-value greater 24h ( Pin16 high (RGB present on
Scart-2)
To avoid misdetection a "software-integration" (result is
first valid if it was 3-times the same) must be implemented,
determination has to be done approx. every 47msec (no
multiple of V-sync).
WSS on Y/C-Plug:
Picture-Ratio-Information (16:9 or 4:3) on SVHS-
connections is coded via the average DC-level of the
Chroma-signal-line, detection is realised by using an
analogue-input-port of the CC-C.
• ADC- value lower or equal 40h ( 4:3-picture-ratio
delivered
• ADC-value greater 40h ( 16:9-picture-ratio available on
plug
Y/C-Rear is determined via Port40/AIN3 (Pin14) of CC
(WSRI-line) and Port41/AIN4 (Pin15) is used for Y/C-Front
(WSFI-line).
Generation of Status-Information
Pin-8 (Slow Blank):
Only on Scart-1 the Slow-Blank-Status (Level of Pin8)
must be created, which is done via IIC-Bus-register 06h
(Bits 0 & 1) of the STV6410A.
Pin-16 (Fast Blank):
Only the status/level of Pin16-Scart1 must be controlled;
this is realised by using the FB-switch-capabilities of the
STV6410A, which are set via IIC-Bus-register 04h (bits 4
& 5).
WSS on Y/C-Plug:
The appropriate DC-level on Chroma-signal-line for Y/C-
Rear-Out is produced via Port57 (Pin10) of the CC-C
(WSRO-line).
• 4:3 - Picture-ratio supported on Y/C-Plug: Port57 set to 0
• 16:9 - Picture-ratio supported on Y/C-Plug: Port57 set to 1
3.10 Audio Routing Analogue board (Europe / Nafta)
General Description:
The Audio- I/O switching is realised by the STV6410 I/O
switch.
By I
2
C Bus (SDA-0/SCL-0) it is possible to control all the
Audio in- and outputs (for detailed Information we refer to
the STV6410 routing overview).
Analog audio coming from DV-Board and second rear
Cinch input is routed via MSP3415 to the STV 6410. After
selecting the audio source via STV 6410, the signal must
be transformed into the digital domain. For this, the UDA
1360TS (ADC) is responsible. An input-voltage of up to
2Vrms can be handled from the IC´ s. For further
processing, the UDA 1360TS (ADC) delivers the data-in
2
I
S format to the digital-board. After a certain delay the
(processed) data come back from the digital board to the
UDA 1328 (DAC). The UDA 1328 (DAC) transforms the
I
2
S data back into the analog domain and feeds the signals
direct to the MC33078 (OPV). From the MC33078 (OPV)
the signals are delivered back to the STV 6410 and also
direct to the 2nd rear out Cinch. The other outputs (Scart,
Cinch) are supported by the STV 6410.
Detailed Description STV 6410:
2
The STV 6410 is an I
C bus controlled audio and video
switch matrix, which is able to handle audio input signals
up to 2 Vrms.
The used outputs are equipped with internal level
adjustment possibility. Low distortion and very good
channel separation is a typical peculiarity of this IC. The
output resistance is very low and the frequency bandwidth
is up to 50 kHz.
Detailed Description UDA 1360:
The UDA 1360TS is a stereo Analog-to-Digital Converter
employing bitstream conversion techniques.
The UDA supports the I
2
S-bus data format and the MSB-
justified data format with word lengths of up to 20 bits. The
IC supports also 2Vrms input signals and is designed for
3V3 supply voltage.
The device is able to handle system clocks of 256fs and
384fs.
Typical THD+N at 0dB is -85dB and a S/N performance up
to 97dB is possible.
Detailed Description UDA 1328:
The UDA1328 is a 6 channel DAC employing bitstream
conversion techniques, which can be used either in L3
microcontroller mode or in static pin mode.
The UDA 1328 supports the I
lengths of up to 24 bits.
Digital sound features can be controlled with the L3
interface.
System clock can be set to 256fs or 384fs.
The Device also provides 2 high quality differential
outputs.
Typical THD+N at 0dB is -95dB and a S/N of up to 106dB
is possible.
Supply voltage is 3V3.
Detailed Description MC 33078:
The MC33078 is a dual operational amplifier for audio
applications.
It offers low voltage noise (4.5nV /
frequency performances (15MHz Gain Bandwidth
product, 7V/s slew rate).
In addition the MC33078 has a very low distortion
(0.002%).
DRX-1
2
S-bus data format with word
Hz ) and high
77
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