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Revision 2.2

System Architecture (Continued)

1.2

SOFTWARE

The CS1301/CS1311 software and reference schematic is

provided for a system that decodes media quickly with no

original software development needed. As part of the

CS1301/CS1311 purchase (see Section A.1 "Ordering

Information" on page 24 for purchase details), National will

license for the use of the operating system drivers and

media decoder codecs in object form, which include:

• Communications manager driver.

• Video filter: Takes the video from the VIP (Video Input

Port) of the Geode SCx200 and plays it back through

the operating system media player.

• Various multimedia codecs.

1.2.1

Software Support

National provides a reference schematic and the associ-

ated software for a processor/coprocessor solution using

the Geode SCx200 and the CS1301/CS1311. This imple-

mentation is currently supplied as a multimedia decoder for

CE player under Microsoft Windows CE.net or Linux.

Future support for Microsoft Windows XP is planned. Since

this is a software-based DSP (Digital Signal Processor)

coprocessor rather than strictly a silicon-based coproces-

sor, the software can be upgraded to support evolving

media standards without a redesign of the hardware.

1.2.2

Software Features Support

The CS1301/CS1311 multimedia solution supports the fol-

lowing software components:

General Support

• Reverse 3:2 pull down

• Progressive display output

• Capture Video Input

MPEG-1 Decoding

• System stream (ISO 11172-1):

—Up to 1.5 Mbps

• Video stream (ISO 11172-2):

— CIF (up to 360x288) resolution

— 29.97 fps (NTSC)

—25 fps (PAL)

— Upto 1.12Mbps

• Audio stream (ISO 11172-3): MPEG-1 layers 1 and 2:

— Up to 384 Kbps, 32 KHz, 44.1 KHz or 48 KHz sample

rate

MPEG-2 Decoding

• Program stream (ISO 13818-1): DVD style MPEG-2

program stream

• Video stream (ISO 13818-2) - Main level at main profile:

— Full screen NTSC (720x480) at 29.97 fps

— Full screen PAL (720x576) at 25 fps

• Audio stream - MPEG-2 audio:

— Layers 1 and 2 (ISO 13818-3) at 32 KHz, 44.1 KHz or

48 KHz sample rate

— AC3 audio at 32 KHz, 44.1 KHz or 48 KHz sample

rate

MPEG-1, MPEG-2 Layer 3 Audio Decoding (MP3)

• Up to 384 Kbps

• Up to 48 KHz sample rate

• Fixed bit rate decoding

MPEG-4 Decoding

• Video stream - “Simple profile”:

— CIF resolution at 30 fps, up to 384 Kbps

• Audio stream - “High quality profile”:

— MPEG-4 AAC low complexity and MPEG-4 CELP

WMT (Windows Media Technology) Decoding

• Video stream - Windows Media Video v8, also supports

v7 decode:

— CIF resolution at 30 fps, up to 1 Mbps

• Audio stream - Windows Media Audio v8, also supports

v7 decode:

— Up to 128 Kbps and 48 KHz sample rate

Windows Media Player Integration

An implementation has been developed to seamlessly inte-

grate Windows Media Player with WindowsCE.net or

Linux. National has taken advantage of the native playback

features supported by Microsoft DirectShow and has

extended that functionality to the CS1301/CS1311. Win-

dowsCE.net ships with an ActiveX control that wraps the

filter graph manager and provides a very high level API

(Application Programming Interface). It also supports a

browser plug-in. An application writer can use the ActiveX

control interface to playback MPEG-1/MPEG-2 media

types. The user can also open the MPEG-1/MPEG-2/WMT

files in Windows Media Player by double clicking on the file

or by launching WMP, then opening the selected media.

New codecs are continually being developed and added

(see National’s IA Developer’s web site for a list of sup-

ported codecs).

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