GDC21D301A Datasheet, PDF (4/35 Pages) Hynix Semiconductor – Transport Decoder

1. General Description
The GDC21D301A Transport Decoder
resides in the center of an MPEG-2 decoding
system. It accepts MPEG-2 transport streams,
parses the transport and packetized
elementary stream (PES) layers into the
separate data streams, and provides rate
buffering for the parsed data streams. Then it
passes those data streams to video and audio
decoders. The GDC21D301A also extracts
Program Clock Reference (PCR) in the data
stream and provides the Pulse Width
Modulation (PWM) signals in order to
recover the clock and to synchronize the
playback of video and audio. The
GDC21D301A manages an external DRAM
that is used for data storage and buffering the
various parsed data streams. This DRAM is
shared with the host processor so that the
system’s memory requirements can be
consolidated into a single, low-cost DRAM.
The GDC21D301A stores data packets
destined for the host directly in shared
DRAM for easy access by the host.
GDC21D301A
GDC21D301A
Transport Decoder
2. Features
The GDC21D301A is fully compliant with MPEG-
2 ISO/IEC 13818-1 specification.
Decoding Features
• Performs MPEG-2 transportation and PES layer
handling
• Supports maximum 80 Mbps transport streams
• Provides a high-speed data output port
• Identifies and extracts up to 32 transport stream
(TS) packet PIDs
PCR & Time Stamp Control Features
• Provides two PWM signals to recover the system
clock
• Provides the instant value of internal STC
counter when a frame begins
• Extracts PTS and DTS of video and audio for
Lip-synchronization
Interface
• Supports byte-parallel/bit-serial TS input
• Supports video/audio PES layer or elementary
stream layer output
• Provides error code insertion capability in video
elementary stream
• Supports an external error input signal for
declaring an erroneous packet
• Supports 8/16-bit host bus interface
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