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  NEC Electronic Components Datasheet  

D61012 Datasheet

UPD61012

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D61012 pdf
NEW PRODUCTS 5
MPEG1 DECODER LSI FOR VIDEO CD
µPD61012
www.DataSheet4U.com
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 µPD61012 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 µPD61012 is Japan’s 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 µPD61012 offers an ideal
configuration for the Chinese video CD
system market.
Function
Table 1 lists the functions of the
µPD61012. The major functions are
described below.
1. MPEG1 decoder
The µPD61012 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
Function
MPEG1
video decode
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)
OSD function
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)
Video output
Composite output, Y/C separate output, RGB output (analog output)
Supports PAL and NTSC TV systems
Host interface
Serial interface: 2-wire, 3-wire
Parallel interface: 8-bit separate mode, 8-bit multiplexed mode
Others
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
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 µPD61012 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
µPD61012 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


  NEC Electronic Components Datasheet  

D61012 Datasheet

UPD61012

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D61012 pdf
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Fig. 1 Example of Video CD System Configuration
input in association with the decoding
operation of MPEG1. If code input is
stopped, code input control by the CD-ROM
decoder block can be mitigated by
automatically setting the next input address
to an internal register.
The µPD61012 recognizes the data input
to the CD-ROM decoder in real time. If the
CD-ROM data is illegal, this data is
discarded before a code is transferred to the
MPEG1 decoder block, so that noise on
image and sound can be prevented by not
decoding the illegal data.
The µPD61012 can specify an LR clock,
whether data is transferred starting from the
MSB or LSB, a data length, and a bit clock
by using registers, so that it can be connected
to the CD player of each manufacturer. It
also supports the I2S interface used in
Phillips’ CD players.
3. OSD function
The OSD of the µPD61012 can display
224 fixed characters and 31 user-defined
characters. To support video CDs in the
Chinese market, 77 Chinese characters are
included as the fixed characters. If the user-
defined character display function is used
under control of a microcontroller, any
characters including 31 Chinese characters
can be displayed. The user-defined
characters can be rewritten at any time,
except while MPEG1 data is decoded.
4. Video output
The µPD61012 can output composite
signals supporting PAL/NTSC output, Y/C
separated signals, and RGB signals.
When displaying a code in the NTSC
format on a PAL monitor, images are not
displayed on the upper and lower 24 lines
with the conventional method because of
problem of image size. The µPD61012 has
a function to output an NTSC sync signal
by using a PAL subcarrier. PAL60 displays
full-screen images on PAL monitors, using
480 lines.
5. Reduced screen function
The µPD61012 halves the I picture of a
motion picture (image compressed in a
screen) or standard still picture (352 x 240
pixels or 352 x 288 pixels) vertically and
horizontally to display the picture as a High
Resolution still picture (704 x 480 pixels or
704 x 576 pixels). It can therefore reduce
the display screen to 1/4 vertically and
horizontally.
Reduced screens can be displayed at any
position, thus enabling multi-screen display.
By displaying the first image of a track on
the reduced screen, dummy menu playback
can be realized for video CDs without
playback function.
System Configuration
The µPD61012 configures a video CD
system when it is connected with an external
microcontroller for system control, audio
DAC, and 4M-bit DRAM for decoding.
Figure 1 shows an example of a video CD
system configuration using the µPD61012.
Conclusion
The µPD61012 introduced here integrates
an OSD, CD-ROM decoder, video encoder,
and video DAC, with an eye for the Chinese
video CD market. NEC plans to develop
new products to satisfy demand in the video
CD market, which is predicted to continue
expanding.
34


Part Number D61012
Description UPD61012
Maker NEC
Total Page 2 Pages
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