© 2002 National Semiconductor Corporation

1

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General Description

CS1311 multimedia companions act as coprocessors to

decode multimedia in National’s Geode single chip proces-

sor-based systems (i.e., SC1200/SC1201, SC2200, and

SC3200, hereafter referred to as SCx200). They provide a

multimedia experience for an Information Appliance (IA)

user that cannot typically be achieved on a PC.

By implementing a dedicated coprocessor to perform multi-

media tasks, a high quality video viewing experience can

be achieved. This high quality is achieved by having a

coprocessor architecture that is ideally suited for decoding

digital media. In addition, since the decoding is not occur-

ring on the SCx200, system events cannot interrupt the

coprocessor’s task of decoding media and thereby causing

stuttering of sound or interruptions in the video.

Lower power consumption can also be achieved using the

SCx200/CS1301

or

SCx200/CS1311

solution.

The

CS1301/CS1311 has an architecture specifically designed

for decoding media. The architecture is such that while

decoding media, power is not consumed by portions of the

system that are not used to decode media. Since the

SCx200 is not decoding the media locally, it is able to go

into a lower power state. When the CS1301/CS1311 is not

decoding media, it uses almost no power.

Additionally, since the architecture is designed for decoding

media, fewer CS1301/CS1311 cycles are required.

Internal Block Diagram

2/4/6/8 Ch. Digital Audio

up to 22 MHz AO_SCK

IEC958 up to 40 Mbit/sec

Huffman Decoder

Slice-At-A-Time

MPEG-1 & 2

CCIR-656 Digital Video

32-Bit Data

(up to 664 MB/sec)

Down and Up Scaling

YUV --> RGB

(50 Mpix/sec)

PCI V2.1 (32 bits, 33 MHz)

External Bus

ACCESS.bus Interface

to EEPROM

Video In

SDRAM

PCI Interface

Video Out

Audio In

Audio Out

S/PDIF Out

ACCESS.bus

Interface

VLD

Coprocessor

Timers

VLIW

CPU

32K I$

16K D$

Image

Coprocessor

Main Memory Interface

Stereo Digital Audio

up to 22 MHz AI_SCK

CCIR-656 Digital Video

YUV 4:2:2 up to 81 MHz

(40 Mpix/sec)

Preliminary

August 2002

Revision 2.2

Geode™ CS1301/CS1311 Multimedia Companion:

Media Coprocessor

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