Philips LX9000R/22, Service Manual

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Circuit-, IC descriptions and list of abbreviations EN 160 LX9000R 9.
9.10.3 IC’s Digital Board
IC7100: VSM
GENERAL DESCRIPTION
The Versatile Stream Manager (VSM) is an ASIC used in the first generation DVD Video
Recorder. Main function of the VSM is to interface directly to the different hardware modules
such as Basic Engine, MPEG encoders, MPEG decoders and buffering the data streams that
are coming from or going to these hardware modules.
The VSM contains a memory interface to support one 4M*16 SDRAM device. A host interface
allows a CPU to directly access this memory and the VSM s internal registers.
Handling of data streams is done using scatter / gather DMA s under software control.
Hardware support is provided in the VSM to support software MPEG AV multiplexing.
FEATURES
The VSM features include:
· SDRAM memory interface to support one 4 banks*1M*16 (64Mbit) SDRAM device.
· Glueless Host Interface for STM s STi5505.
· Glueless MPEG Decoder interface for STM s STi5505
· Glueless interface to Philips SAA6750 MPEG Video Encoder or SAA6752 MPEG AV
Encoder.
· Glueless interface to Motorola s DSP56362 used as MPEG Audio Encoder.
· Glueless interface to Philips HDR65 as part of Basic Engine interface including the Sector
Processor as also included in the STi5505.
· Audio Clock Control providing PLL loop and clock lock detection.
· Double Extraction of VBI decoded data from extended CCIR 656 stream.
· Double UART with hardware handshake and 8 byte Rx/Tx FIFO.
· Generation of additional Host Bus to support Audio Encoder DSP56362.
· Descriptor based DMA Controllers for data stream handling.
· Hardware support for software MPEG multiplex process.
· Internal Interrupt Controller to handle internal and 4 external interrupt sources.
· Operates from single 27 MHz clock input.
· JTAG for production tests.
· 3.3V logic core.
· 3.3V / 5V toleration IO pins.
· 208 PIN LQFP Package.
(CR1087)
BLOCK DIAGRAM
Figure 2.1 shows the block diagram of the VSM. The hardware blocks can be divided in to
three categories:
· General modules: Host Interface, Memory Interface, Interrupt Controller.
· DMA
Controllers.
· Functional Interfaces; the link between the actual external hardware interface and the DMA
Controller. Some Functional Interfaces have knowledge about the stream coming through in
order to perform for example MPEG stream characteristics extraction and insertion.
VERSATILE STREAM MANAGER