Philips DVD763SA/001 Service Manual page 58

Circuit Descriptions and List of Abbreviations
The SACD DSD/DST decoder Furore 2 uses 1.8V for its core
and analogue portion, and 3.3V for its interface. The on-board
1.8V linear regulator LF18ABDT and 3.3V linear LD1117DT33
are used to generate 1.8V and 3.3V power supply respectively.
The back-end section mainly uses the 1.8V or 2.5V and 3.3V,
which depend on which back-end processor is used. The on-
board linear regulators LF25ABDT or LF18ABDT are used to
generate the 2.5V (or 1.8V) required by the STi55xx.
The front-end section mainly uses the 5V and 12V. An on-
board linear regulator LD1117DT33 can be used to generate
the 3.3V required by the front-end. The 12V is used by the
motor and servo drivers.
Reset Circuit
Power On
Reset
Low Voltage
RESETn
Detection
Circuit
4.5V
Delay 1
RSTN
Power On
Reset
Low Voltage
Detection
Circuit
4.5V
Delay 2
Figure 9-10 Block diagram of reset circuit
This reset circuit takes care that booting the different devices
on the mono board takes place in the correct order. The correct
reset order is:
1. The Power On Reset circuit (delay t1) creates a reset
signal 'RESETn' to reset the STi55xx and Furore .
2. In the meantime, the Power On Reset circuit (delay t1)
creates a reset signal 'CLK_STBCTRL', which is inverted
to 'RESETn', to enable the Clock Factory.
3. Then, the Power On Reset circuit (delay t2) generates a
reset signal 'RES_P' to reset the Basic Engine.
4. The STI55xx can now reset the Basic Engine via 'RSTN'.
STi55xx
Furore 2
CLK_STBCTRL
Clock Factory
RES_P
Basic Engine
CL 26532053_018.eps
260402
DVD763SA
9.4 Audio/Video (A/V) Board
A
P50
7431/32/33
7420/22/24 7421/23 7425
1421
CVBS
Y-IN
C-IN
RGB/YUV
7220
CENTER ON
7201
1400
7200
DCM data
DAC
DSD data
Control
384 FS
*
7100/01/03
CLOCK
GEN.
PCM_CLK
A MUTE
S/P DIF
Figure 9-11 Block diagram A/V board
This board is the interface panel between the DVD-player and
its peripherals. See also block diagram in Chapter 6.
9.4.1 Control
The control of the A/V board is done by the I
(see table below):
Table 9-2 Control lines overview IC7104
Description Pin Hi
CLK_SEL 12 Internal clock
DAC_RESET 10 Normal
CENTER_ON 9 ?
9.4.2 Video
The analogue video signals from the Mono Board are buffered
before they are fed to the several output connectors (SCART,
Cinch, and SVHS). The video output from the A/V Board is
RGB/YUV, YC, and CVBS.
9.4.3 Audio
The digital audio signals are fed to a 6-channel DAC CS4362
(item 7200, 48-pin LQFP) for the audio output. This DAC
accepts both DSD and PCM data streams.
There is a control line from the STi55xx, called CENTRE_ON,
which is used to switch between the centre channel and front
channels for both SACD- and DVD modes.
9. EN 73
S
1403 1300
STATUS
RGB
P50
SCART
Y/C
AUDIO L / R
L / R
CVBS
7435
1 2
CVBS
7436/37
VIDEO OUT
SVHS
7440/41/42
Y U V
7321/23
7202
L R
STEREO
AUDIO
AUDIO OUT
7300 7325/27
L R
VIDEO
FILTER
FRONT
BUFFER
7301 7331
C SW
VIDEO
FILTER C / SW
BUFFER
MULTI CHANNEL
AUDIO
OUT
7302 7333/35
L R
VIDEO
FILTER SURROUND
BUFFER
7604
OPTICAL
DIGITAL
AUDIO OUT
5413
1410
DIGITAL OUT
COAXIAL
CL 26532053_019.eps
010502
2
C-decoder IC7104
Lo
External clock
Reset
?