Philips DVDR3355 Service Manual page 57

Video Part
The analogue video input signals CVBS, YC and RGB are
routed via the board to connector 1521 and sent to Video
Input Processor, TVP5146P [7401].
The digital video input signals from the DV-in on the Front
board are routed from connector 1521 via the IEEE 1394 PHY
IC [7301] to the Domino chip [7101].
The Video Input Processor encodes the analogue video to
digital video stream (CCIR656 format). The output stream,
named VID_D (9:0), is then routed to the Domino chip. This
IC encodes and decodes the digital video stream into / from
MPEG2 format.
Audio Part
I 2 S audio is sent from the Analog board to the Domino chip
via connector 1536.
The Domino chip compresses the I
MPEG1-L2 / AC3 audio stream.
2
Front-end I S
The Domino chip interfaces directly to the basic Engine via
8.3.4. Clock Distribution
14.31818MHz
7401
VIP
TVP5146
7301
1934 PHY
24.576 MHz
The Domino chip has a complex system, which is needed to
support the processes running at different frequencies such
as video decoding, audio decoding or peripheral I/O devices
etc. To ensure a synchronous initialization of all the registers
and state machines, all the PLLs are switched to their default
frequency 27MHz.
Then when the booting control unit is correctly initialized and
once it has captured all the booting parameters, it sets the
PLLs to its functional frequencies. Thanks to a clock blocking
mechanism, the frequency switching is glitch free.
Circuit- and IC description
2
S audio data into an
FRONTEND INTERFACE
7101
DMN-8602
Figure 8-4 DIMINO_CLOCK
3139 785 30981
ATAPI connector 1571.
It buffers the data streams that are coming from (or going to)
the Basic Engine.
In the Domino chip, the video MPEG2 stream and the audio
AC3 stream are sent to the basic Engine for recording
through ATAPI bus.
8.3.2. Playback mode
During playback, the data from the Basic Engine is going
directly to the Domino chip via ATAPI interface. The Domino
chip has the following outputs:
•
Analogue video CVBS, YC and RGB outputs on
connector 1521
•
I 2 S audio (PCM format) on connector 1536
•
SPDIF audio (digital audio output) on connector 1536
•
Progressive Scan output connector 1522 (Not for
European version)
8.3.3. Basic Engine Interface
The Digital board is equipped with an IDE bus (ATAPI) for
connecting to the Basic Engine.
DOMINO
13.5 MHz
System clocks:
•
DMN-8602 (7101, pin E1 and F1): 13.5 MHz provided by
the x'tal 1101
•
DMN-8602 1394-LINK (7101, pin L1): 49.152MHz
provided by 1394-PHY
•
TVP5146 (7401, pin 74 and 75): 14.31818MHz provided
by x'tal 1461
•
SDRAM (7211 and 7231, pin 45 and 46): 150MHz
provided by the DMN-8602
•
TSB41AB1PHP IEEE 1394 PHY IC (7301, pin 42 and
43): 24.576MHz provided by x'tal 1351
8. EN 57
7211
150 MHz
SDRAM
7231
SDRAM