SAA7134 Philips Semiconductors, SAA7134 Datasheet - Page 17

• Manufacturer Part Number: SAA7134
• Description: PCI audio and video broadcast decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
The SAA7134HL incorporates two 9-bit video ADCs and
the entire decoding circuitry of any analog TV signal:
NTSC, PAL and SECAM, including non-standard signals,
such as playback from a VCR. The adaptive multi-line
comb filter provides superb picture quality, component
separation, sharpness and high bandwidth. The video
stream can be cropped and scaled to the needs of the
application. Scaling down as well as zooming up is
supported in the horizontal and vertical direction, and an
adaptive filter algorithm prevents aliasing artifacts. With
the acquisition unit of the scaler two different ‘tasks’ can be
defined, e.g. to capture video to the CPU for compression,
and write video to the screen from the same video source
but with different resolution, colour format and frame rate.
The SAA7134HL contains TV sound stereo decoding from
Sound IF (SIF), for NICAM standards and dual carrier
FM systems, as used in European and Asian countries.
Baseband stereo audio sampling is also implemented, e.g.
for capturing from a camcorder or externally decoded
BTSC. The audio sampling rate can be locked to the video
frame rate to ensure synchronization (lip-sync) between
the video and audio data flow, e.g. for storage,
compression or time shift viewing applications.
The SAA7134HL incorporates analog audio pass-through
and support for the analog audio loop back cable to the
sound card function.
The decoded video streams are fed to the PCI-bus, and
are also applied to a peripheral streaming interface, in ITU,
VIP or VMI format. A possible application extension is
on-board hardware MPEG compression, or other feature
processing. The compressed data is fed back through the
peripheral interface, in parallel or serial format, to be
captured by the system memory through the PCI-bus. The
Transport Stream (TS) from a DTV/DVB channel decoder
can be captured through the peripheral interface in the
same way.
Audio, video and transport streams are collected in a
configurable FIFO with a total capacity of 1 kbyte. The
DMA controller monitors the FIFO filling degree and
master-writes the audio and video stream to the
associated DMA channel. The virtual memory address
space (from OS) is translated into physical (bus)
addresses by the on-chip hardware Memory Management
Unit (MMU).
The application of the SAA7134HL is supported by
reference designs and a set of drivers for the Windows
operating system (Video for Windows and Windows Driver
Model compliant).
2002 Dec 17
PCI audio and video broadcast decoder
17
7.2
The SAA7134HL enables PC TV capture applications
both on the PC mother board and on PCI add-on
TV capture cards. Figures 5 and 6 illustrate some
examples of add-on card applications.
Figure 5 shows the basic application to capture video from
analog TV sources. The proposed tuner types incorporate
the RF tuning function and the IF downconversion. Usually
the IF downconversion stage also includes a single
channel and analog sound FM demodulator. The Philips
tuner FI1216MK2 is dedicated to the 50 Hz system
B/G standard as used in Europe. The FI1236MK2 is the
comparable type for the 60 Hz system M standard for the
USA. Both types are suited for terrestrial broadcast and for
cable reception. The tuner provides composite video and
baseband audio as mono or ‘multiplexed’ (mpx) in case of
BTSC. These analog video and sound signals are fed to
the appropriate input pins of the SAA7134HL.
Further analog video input signals, CVBS and/or Y-C, can
be connected via the board back-panel, or the separate
front connectors, e.g. from a camcorder. Accompanying
stereo audio signals can also be fed to the SAA7134HL.
Video is digitized and decoded to YUV. TV sound is
digitized and decoded to stereo audio, according to
NICAM or dual FM standards. The digital streams are
pumped via DMA into the PCI memory space.
The SAA7134HL incorporates means for legacy analog
audio signal routing. The on-chip audio DACs convert the
digital decoded stereo signal into analog audio. This
analog audio input signal is fed via an analog audio loop
back cable into the line-in of a legacy sound card.
An external audio signal, that would have otherwise
connected directly to the sound card, is now routed
through the SAA7134HL. This analog pass-through is
enabled as default by a system reset, i.e. without any
driver involvement and before system set-up.
During the power-up procedure, the SAA7134HL will
investigate the on-board EEPROM to load the board
specific system vendor ID and board version ID into the
related places of the PCI configuration space. The board
vendor can store other board specific data in the EEPROM
that is accessible via the I
Application examples
2
C-bus.
SAA7134HL
Product specification