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CMX608 数据表(PDF) 45 Page - CML Microcircuits

部件名 CMX608
功能描述  Integrated Input and Output Channel Filters
PDF  70 Pages
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制造商  CMLMICRO [CML Microcircuits]
网页  http://www.cmlmicro.com
标志 CMLMICRO - CML Microcircuits

CMX608 数据表(HTML) 45 Page - CML Microcircuits

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RALCWI Vocoder
CMX608/CMX618/CMX638
 2014 CML Microsystems Plc
45
D/608_18_38/11
ENCFRAME register address $30
7
6
5
4
3
2
1
0
Encoded Frame
This read only register contains the encoded speech data frames. This is a byte wide streaming
register containing up to 36 bytes of data. The amount of data to be read depends on how the
device has been configured with the VCFG register ($07). Bit 7 is the msb.
This register should be read whenever the VDA bit is set in the status register. This indicates that
a frame of vocoded speech is now available. Whilst it is not necessary to read this data out
immediately, it must be read before another frame of vocoded speech is produced.
The frequency of frames is also dependant on the configuration. The following table shows the
amount of data that needs to be read, and the frequency of production against the configuration
setting:
VCFG Register
Description of packet
ENCFRAME
7
6
5
4
3
2
1
0
Byte
Count
Prod.
every
x
x
x
0
0
1
0
1
2400bps 1x20ms frame
6
20ms
x
x
x
0
0
1
1
0
2400bps 2x20ms frames
12
40ms
x
x
x
0
0
1
1
1
2400bps 3x20ms frames
18
60ms
x
x
x
0
0
1
0
0
2400bps 4x20ms frames
24
80ms
x
x
x
0
1
0
0
1
2750bps 1x20ms frame
7
20ms
x
x
x
0
1
0
1
0
2750bps 2x20ms frames
14
40ms
x
x
x
0
1
0
1
1
2750bps 3x20ms frames
21
60ms
x
x
x
0
1
0
0
0
2750bps 4x20ms frames
28
80ms
x
x
x
1
0
1
1
1
2400bps 3x20ms frames with FEC
27
60ms
x
x
x
1
1
0
1
1
2750bps 3x20ms frames with FEC
27
60ms
x
x
x
1
0
1
0
0
2400bps 4x20ms frames with FEC
36
80ms
x
x
x
1
1
0
0
0
2750bps 4x20ms frames with FEC
36
80ms
Table 7 Encoder Packet Description
This register is also used to read the contents of the external CODEC command FIFO. The
CODEC command FIFO is a word (16-bit) FIFO, so the data is presented as two bytes per word:
the first byte being the most significant byte of the word. Please refer to the EXCODECCONT
register ($0B) for more information.



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