CS98100 Cirrus Logic, Inc., CS98100 Datasheet - Page 21

• Manufacturer Part Number: CS98100
• Description: DVD Video Processor With Progressive Scan
• Manufacturer: Cirrus Logic, Inc.

The audio interface also includes a flexible PCM
input interface, which can input a wide range of
protocols from IEC-958 receiver. Another, low-
cost approach for audio input is the internal sigma-
delta demodulator. This module inputs a digital
PWM version of the audio input, which can be cre-
ated on the board using an inexpensive ramp gener-
ator and comparator. The sigma-delta demodulator
uses a set of programmable filters to reconstruct 9-
bit (mono) audio data at up to 12 kHz sampling fre-
quency.
3.10
The CS98100 Video processor is a powerful, fully
programmable video post processing engine that
displays video on an interlaced TV or a progressive
HDTV. A 16-tap polyphase vertical filter is fully
programmable on a line-by-line basis, to provide
high quality vertical scaling and interlaced field
conversion. Horizontal filtering is done with a pro-
grammable 16-tap polyphase filter. This advanced
filter processing is used for de-interlacing, zoom,
and frame size conversion.
Source mode of interlaced or progressive is deter-
mined from the disk type automatically. For pro-
gressive source detection, 3:2 pulldown is detected
from status flags in the video stream to ensure op-
timized playback. Interlaced video source is fil-
tered up to progressive size output using the
bilinear vertical filter. This is visibly superior to
simple line doubling. Each 240 line field being fil-
tered and output at 480p. Progressive video source
is output at the full progressive resolution. Each
480 line frame output at 480p. Source mode of in-
terlaced or progressive is determined from the disk
type. For progressive source detection, 3:2 pull-
down is simply detected from status flags in the
video stream.
Zoom is fully programmable, from 1X to 500X
zoom, with any value in between. Frame type con-
version, from NTSC to PAL, or PAL to NTSC, is
done with a the bilinear vertical filter, reducing
Video Processing
flicker and jaggies.
There is a programmable gamma-correction look-
up table for the final output. Cirrus Logic provides
some easy to use utilities in order to get the best ad-
vantage of the powerful video filtering capabilities
of the CS98100. The video encoder sends progres-
sive or interlaced digital video data to the internal
video encoder, and can output parallel digital data
to an external video encoder.
The video processor also allows multiple video
plain overlay (main video / sub-picture / on-screen
display). The sub-picture unit is a hardware-only
solution which performs high-quality vertical scal-
ing for PAL/NTSC conversion, and full support for
DVD (sub-picture) and SVCD (OGT) modes. The
on-screen display unit features 2-bit and 4-bit pix-
els, 16 transparency levels, and three independent
regions of up to full-screen size. The picture-in-pic-
ture unit can place a 1/2 or 1/4 screen sized window
anywhere on the screen. This feature can be used
for special effects, such as snapshot freeze and
zoom assist.
3.11
The video encoder uses three 10-bit DACS to con-
vert digital data to component (RGB or YP
composite (composite plus S-Video) analog video.
The output can be interlaced (PAL/NTSC) or high
resolution progressive. In progressive mode, the
video encoder will typically drive YP
line television at 59.94 Hz, although other output
modes are possible, such as 625 lines and RGB.
The encoder performs the Macrovision copy pro-
tection function for all modes (revision 7.1 for in-
terlaced, revision 1.03 for progressive). Other
features include built-in voltage reference, color
bar generator, individual power-down control for
each DAC, programmable baseband filters, col-
or/contrast/tint controls, Closed Captioning (inter-
laced modes), wide screen signalling (PAL mode),
and Copy Generation Management System (NTSC
and progressive modes).
Video Encoder
CS98100
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