1-18
Introduction
Final Rev F
Copyright 1996 by LSI Logic Corporation. All rights reserved.
decoder for its channel buffers, eliminating the need for the extra DRAM
found in non-integrated audio solutions.
1.5.3
Post Processing
The L64005 uses on-chip interpolation lters to interpolate images with
resolutions below 720 x 480 to full size. This allows programming pro-
duced at different resolutions to be decoded and displayed on televisions
with standard NTSC or PAL timing. As well, these lters enable the
decoder to interface with digital or analog NTSC or PAL modulators oper-
ating at standard frequencies (typically 27 MHz). Using these lters, the
decoder also supports pan and scan of the MPEG image to 1/8 pixel
accuracy.
Figure 1.7
System Block
Diagram
1.5.4
On-Screen
Display
The L64005 also integrates an on-screen display controller capable of
overlaying an image up to 720 x 480 pixels (720 x 576 for PAL) at up to
4 bits/pixel on top of an MPEG video sequence while it is being decoded.
Up to 16 colors can be selected per scan line. Each scan line may have
its own set of colors. Bitmaps for on-screen display may be assembled
off-screen then made visible instantaneously. Hardware panning and
scrolling of the overlay data is supported. The overlay planes remain
xed in size regardless of the resolution of the MPEG sequence. This
means that scaling of the MPEG sequence to full-frame display does not
affect the size or delity of text on the overlay plane.
Microcontroller
ROM/
EEPROM
Baseband
Channel
Demodulator/
ECC/
Decrypt/
L64005 MPEG-2
A/V Decoder
Video Coder/
DACs
2 MByte
DRAM
Baseband
Video
Stereo
Audio
Transport
CD
Audio
DACs
or SDRAM