NEW PRODUCTS 5
MPEG1 DECODER LSI FOR VIDEO CD
碌PD61012
Yasuhiko Kawaguchi
Introduction
The market of video CDs using an MPEG1
decoder has rapidly expanded, particularly
in Asian countries such as China and Korea.
Recently, demand for video CD players in
China has grown because of their falling
price, and high-cost-performance video CD
systems with an MPEG1 decoder and
peripheral functions are in high demand.
The
碌PD61012
is ideal for the type of
video CD systems required in the Chinese
market because it provides the peripheral
functions necessary for video CD systems
on a single chip.
Outline
The
碌PD61012
is Japan鈥檚 first MPEG1
decoder LSI for video CD that integrates an
MPEG1 decoder, video encoder, video DAC,
CD-ROM decoder, and on-screen display
(OSD) on a single chip.
In addition, equipped with OSD characters
supporting Chinese, a code input control
function for damaged discs, reduced screen
playback function, and a playback control
memory, the
碌PD61012
offers an ideal
configuration for the Chinese video CD
system market.
Function
Table 1 lists the functions of the
碌PD61012.
The major functions are
described below.
1. MPEG1 decoder
The
碌PD61012
can decode motion picture
data of a video CD (352 x 240 x 30 frames:
NTSC format, or 352 x 288 x 25 frames: PAL
format) and High Resolution still picture data
Parameter
MPEG1
video decode
Function
352 pixels x 240 lines x 30 frames
352 pixels x 288 lines x 25 frames
704 pixels x 480 lines (High Resolution still picture)
704 pixels x 578 lines (High Resolution still picture)
Supports MPEG1 audio layers 1, 2
MPEG1
Sampling frequency: 44.1 kHz
audio decoding Bit rate: All bit rates except free format
Mode: Monaural, stereo, joint stereo, dual channel
CD-ROM
data format
Mode1
Mode2Form1
Mode2Form2?(double-speed input supported)
Character size: 12 x 18 dots
Character type: 224 fixed characters
31 user-defined characters
Color: Character color and background color can be specified in screen units.
Function: Framing, with/without background color, blinking, expansion
(1 to 4 times)
Composite output, Y/C separate output, RGB output (analog output)
Supports PAL and NTSC TV systems
Serial interface: 2-wire, 3-wire
Parallel interface: 8-bit separate mode, 8-bit multiplexed mode
Reduced screen function
Supports auto pause
8 KB sector buffer
Can be decoded with 60-ns 4M DRAM
Operating voltage: 3.0 to 3.6 V
100-pin QFP
OSD function
Video output
Host interface
Others
Table 1 Function List
(704 x 488 pixels, or 704 x 576 pixels).
To automatically recognize and decode
image size, it can implement frame format
conversion according to the output monitor.
In other words, the
碌PD61012
can output
disc data recorded in the NTSC format to a
PAL monitor, and disc data recorded in the
PAL format to an NTSC monitor.
Errors due to erroneous MPEG1 data are
corrected by image skipping and muting.
2. CD-ROM decoder
The internal CD-ROM decoder of the
碌PD61012
supports the MODE1,
MODE2form1, and MODE2form2 data
formats. The data of MODE2form2 of
MPEG1 data can be input at double speed.
The CD-ROM decoder can control code
Published January 1998
System Micro Engineering Department, Semiconductor Solution Engineering Division
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