GDC21D301A datasheet(4/35 Pages) HYNIX

4 / 35 page

GDC21D301A

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

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

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.

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

GDC21D301A

Transport Decoder

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