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MAS3549F 参数 Datasheet PDF下载

MAS3549F图片预览
型号: MAS3549F
PDF下载: 下载PDF文件 查看货源
内容描述: MAS 35x9F MPEG 2/3层, AAC音频解码器, G.729附录编解码器 [MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec]
分类和应用: 解码器编解码器
文件页数/大小: 92 页 / 1187 K
品牌: MICRONAS [ MICRONAS ]
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MAS 35x9F  
DATA SHEET  
Table 3–9: D0 control memory cells, continued  
Memory  
Address  
(hex)  
Function  
Name  
D0:34d  
Operation Mode Selection (reset = 0  
)
G.729  
UserControl  
hex  
The register is used to switch between basic G.729 operation modes.  
bit[19:7]  
bit[6]  
Reserved, set to 0  
Page headers  
0
1
enable  
disable  
If the page headers bit is 0, a header frame is transfered before each page of  
50 data frames. If the header bit is 1, all the frames are G.729 data frames.  
Please (see Section 3.3.8. on page 44).  
bit[5:4]  
Decoding speed  
00  
01  
10  
11  
8 kHz (normal)  
6 kHz (slow)  
12 kHz (fast)  
not allowed  
The recording (encoding) is always done with a sampling rate of 8 kHz. During  
decoding this control can be used to speed up or slow down the playback.  
bit[3]  
bit[2]  
Reserved, set to 0  
Pause encoder/decoder  
0
1
normal operation  
pause  
If the pause bit is set, the processing continues until the current page is fin-  
ished and then en-/decoding is paused. The pause mode lasts until the pause  
bit is cleared again or the mode is set to 0.  
bit[1:0]  
Mode  
00  
idle  
01  
10  
11  
decode  
not allowed  
encode  
To switch to encoder operation mode, UserControl has to be set to 3 . Then  
hex  
50 frames are encoded and sent via the PIO interface. This is repeated until  
the UserControl register is changed. If the transmission of headers is enabled,  
each page of 50 frames is preceeded by a header frame as shown in Fig. 3–4  
on page 44.  
To switch to decoder operation mode, UserControl has to be set to 1 . For  
hex  
decoding with slow speed, UserControl must be 11 , for decoding with fast  
hex  
speed it must be 21 . Then the decoder is requesting several frames via the  
hex  
PIO interface to fill its internal buffer. If enough data is available, 50 frames are  
decoded. This is repeated until the UserControl register is changed. If the  
transmission of headers is enabled, a header frame has to be sent before  
each page of 50 frames (see Fig. 3–4 on page 44).  
To switch off the encoder or decoder, UserControl has to be set to 0 . Then  
hex  
the encoding/decoding and sending/receiving of frames continues until the  
end of the current page and the operation mode is set to stop.  
36  
June 30, 2004; 6251-505-1DS  
Micronas  
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