Extremely low power consumption Ogg Vorbis player realized by

Extremely low power consumption Ogg Vorbis player realized by
Extremely low power consumption Ogg Vorbis player
realized by FineArch One Chip Audio System
Outline
FineArch One Chip Audio System offers an optimal processing environment for a portable music player which demands a small size and a low power consumption. A flexible
and high-speed system is built on a single chip by combining a CPU, which can perform
complicated processing, a DSP, which has a high throughput, and various kinds of peripherals, necessary for final products. As the first product using this system, we developed
the decoding system IP of the Ogg Vorbis; an audio compression format of the next generation known for an open source, a high quality, and high compression ratio. We realized
all basic functions needed for a portable audio player, such as file read-out from the memory card, decoding of compression music data, a DAC output, a display of a liquid crystal display, and management of a user
interface, on a single chip operating at only 12 MHz system clock. Such a low frequency shows a processing efficiency of our
system is more than 6 times higher than that of a system which employs a general CPU only, and lengthens the effective battery
life of portable players.
Load Distribution
Our Original DSP Core
The original DSP core is designed in a manner of 128-bit
Complicated processes Heavy load processes
written in C language
written in assembly language
fixed length VLIW, and can execute simultaneously four
commands; an ALU operation, two memory accesses, and a
Memory
Card
DSP
CPU
Ogg Vorbis
File Format
flow control. A powerful addressing mode and transfer mode
Ogg Vorbis
DSP Packet
PCM Audio Output
FineArch One Chip Audio System adopts the multi-core
architecture which implements CPU and DSP on a single chip.
A management program of the entire system, such as read-out
of a file and control of a user interface, are programmed in
high level languages, such as C for an easy maintenance, and
is processed by the main CPU. On the other hand, a repeating
calculation
program
indispensable
to
digital
signal
processings is programmed in an assembly language for
giving a higher priority to execution speed, and is processed
by the DSP. To develop the Ogg Vorbis decoder system, we
tuned up load distribution employing a dual core composition
of 1-CPU and 1-DSP, and achieved the remarkably high
efficiency. We are now working on the scalable system which
implements two or more DSPs with one CPU and will develop
a processing system for very high load task such as movie
decoders. We plan to support other compression formats such
enables efficient accesses to memory spaces, and a fast
processing of repeating calculations dispensable to digital
signal processings. From a stage of basic design, the DSP has
been
designed
the
multi-core
architecture
implementation, and has equipped with many features for
performing a smooth synchronization with CPU, such as
IRQs, interlocks, and a mechanism that allows the CPU to
access the internal resorces of the DSP. A step execution
function and a break point register are implemented for
debugging of DSP programs, and provide a confortable
environment to developers.
Key Features
> 128-bit fixed length VLIW
> Simultaneous operation of 4 instructions
> 32-bit fixed point
> Single clock MAC operation
> Size flexible 4 memory spaces
> 16 general purpose data register
> 16 address registers
> Hardware loop counter
> Program counter stack
as MP3 and WMA upon request.
July 15, 2003
supposing
Copyright (C) 2003 FineArch, Inc.
Hardware and Software IP
Our hardware IPs are designed in fully synthesizable RTL
FineArch
Software IPs
RTL
in various formats such as a plane RTL, a netlist, etc., upon
customerÅfs request. Customers can use our hardware IP
FineArch
Hardware IPs
Customer’s Logic
models of VerilogHDL. We can provide our hardware IPs
A firmware for
Ogg Vorbis Player
Custom Edit
for various uses from an FPGA evaluation to a standard cell
Netlist
Logic Synthesis Tool
ASIC. When the hardware IP is provided in plane RTL, the
customer can edit the hardware IP in order to combine with
Place & Route Tool
custom logics. Since all software IPs required for an
application system are provided with the hardware IPs,
FPGA
product development can be performed easily.
ASIC
Ogg Vorbis Evaluation Board
We prepared an evaluation board using ALTERA FPGA for developers. We sell it by order-received production. All features necessary for a final product, such as a power supply connector, an earphone jack, a memory card slot, a liquid crystal display, and an
operation button, are mounted in this evaluation board.
Specification of the Evaluation Board
power supply
>FPGA
earphone jack
ALTERA
>Power
5.0 [V]
>Operating Frequency
12 MHz - 16MHz
>Interfaces
RS232C connector
USB(B-type) connector
ATA drive connection port (44pin)
Logic analyzer extension board connector
SPDIF optical mini jack
Earphone jack
memory card slot
>Memory
1MB SRAM
4MB FLASH
32MB SDRAM
liquid crystal display
>Supported Memory Card
Memory Stick
SD Card
operation buttons
[About FineArch Inc.]
[About OggVorbis]
FineArch is a fabless venture company founded in 2000.
We design system LSI for consumer products.
Ogg Vorbis is an open source, and patent and royalty free music compression format. The first
official version 1.0 has been released on July,
2002. Especially in lower bit rate (higher
compression ratio), Ogg Vorbis has a good reputation of quality of sound compared with that of
MP3 and WMA, thus, is very suitable for portable
music players demand smaller file size.
FineArch Inc.
TIME24 Room 4W-2
2-45 Aomi Koto-ku Tokyo 135-8073, Japan
TEL (+81) 03-5531-0374
FAX (+81) 03-5531-0205
E-mail : [email protected]
URL http://www.finearch.com/
July 15, 2003
Ogg Vorbis Project Home Page
http://www.xiph.org/ogg/vorbis/
Copyright (C) 2003 FineArch, Inc.
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