- 您现在的位置：买卖IC网 > PDF目录380325 > MAS3509F (MICRONAS SEMICONDUCTOR HOLDING AG) MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec PDF资料下载
参数资料
| 型号： | MAS3509F |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | Codec |
| 英文描述： | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| 中文描述： | 新加坡金融管理局35x9F的MPEG 2 / 3层，AAC音频解码器，G.729的附件A编解码器 |
| 文件页数： | 9/92页 |
| 文件大小： | 1186K |
| 代理商： | MAS3509F |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页
DATA SHEET
MAS 35x9F
Micronas
June 30, 2004; 6251-505-1DS
9
2.3.1. RAM and Registers
The DSP core has access to two RAM banks denoted
D0 and D1. All RAM addresses can be accessed in a
20-bit or a 16-bit mode via I
2
C bus. For fast access of
internal DSP states the processor core has an address
space of 256 data registers which also can be
accessed via I
2
C bus. For more details, please refer to
Section 3.3. on page 27.
2.3.2. Firmware and Software
2.3.2.1. Internal Program ROM and Firmware,
MPEG-Decoding
The firmware implemented in the program ROM of the
MAS 35x9F provides MPEG 1/2 Layer 2, MPEG 1/2/
2.5 Layer 3 and MPEG 2 AAC-decoding as well as a
G.729 encoder and decoder.
The DSP operating system starts the firmware in the
“Application Selection Mode”. By setting the appropri-
ate bit in the Application Select memory cell (see
Table 3–8 on page 32), the MPEG audio decoder or
the G.729 Codec can be activated.
The MPEG decoder provides an automatic standard
detection mode. If all MPEG audio decoders are
selected, the Layer 2, Layer 3 or AAC bit stream is rec-
ognized and decoded automatically.
To add/remove MPEG layers while running in MPEG
decoding mode (e.g. Layer 2, Layer 3 (0x0c) to
Layer 2, Layer 3, AAC (0x1c)), the application selec-
tion has to be reset before writing the new value.
For general control purposes, the operation system
provides a set of I
2
C instructions that give access to
internal DSP registers and memory areas.
An auxiliary digital volume control and mixer matrix is
applied to the digital stereo audio data. This matrix is
capable of performing the balance control and a sim-
ple kind of stereo basewidth enhancement. All four
factors LL, LR, RL, and RR are adjustable, please
refer to Fig. 3–3 on page 44.
2.3.2.2. Program Download Feature
The standard functions of the MAS 35x9F can be
extended or substituted by downloading up to
4 kWords (1 Word = 20 bits) of program code and
additionally up to 4 kWords of coefficients into the
internal RAM.
Fig. 2–2:
Encoder signal flow
Fig. 2–3:
Decoder signal flow
OUT
A/D
Audio
Proc.
D/A
Encoder
MIX
PIO
SDI
LINE IN
MIC IN
OUT
A/D
Audio
Proc.
D/A
Decoder
MIX
SDO
S/PDIF
PIO
SDIB
LINE IN
MIC IN
DSP
Volume
Matrix
相关PDF资料 |
PDF描述 |
|---|---|
| MAS3519F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3529F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3539F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3549F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3587F | MPEG Layer 3 Audio Encoder/Decoder |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAS3519F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3529F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3539F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3549F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3559F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
发布紧急采购，3分钟左右您将得到回复。