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參數(shù)資料
| 型號： | PEB2245N |
| 廠商： | SIEMENS AG |
| 英文描述： | ?Multipoint Switching and Conferencing Unit - Attenuation? |
| 中文描述： | ？多點(diǎn)交換和會議股-衰減？ |
| 文件頁數(shù)： | 59/70頁 |
| 文件大小： | 1021K |
| 代理商： | PEB2245N |
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PEB 2245
Semiconductor Group
59
Procedure for Programming a Conference
Configuration Register CFR
G
The conference mode must be selected by setting CFR:FS = 1.
G
The PCM encoding law must be selected, A-law (CFR:CUA0 = 1) or
μ
-law (CFR:CUA0 = 0).
G
The PCM-byte format must be selected:
Conference Control Memory
For each input channel a CCM entry must be made to a dedicated conference control address (cca).
This CCM entry defines the input line and time-slot number, and the input and output processing
parameters. Writing to the CCM consists of two accesses: In the first access, the input channel is
specified, in the second access, the input and output processing and the conference number are
specified. Both accesses must always be performed in the sequence 1st access and then 2nd
access.
The Data Memory (DM) addressed by the cca buffers the input samples for output processing.
The Conference Sum Memory (CSM), addressed by the conference number, contains the
accumulated samples of all input channels having the same conference number.
Connection Memory
The output channels are programmed in the CM. For each output channel a CM entry must be made
defining the output line and time-slot, enabling the output driver, and pointing to the same
conference control address which has been used for the corresponding input channel. Each output
channel contains the sum of the accumulated samples from the CSM minus the input samples
retrieved from the DM of that same channel.
Conference Overflow
If one result of the final substraction exceeds the full-scale value, a saturation appears and an
interrupt is generated (CST:COV = 1) to indicate this overflow condition. The conference number
of the conference which caused the overflow is buffered in the Conference Status Register
(CST:CN4 … 0). This information can then be used to program a larger attenuation level for the
participants of that particular conference.
CUA2
CUA1
PCM-Byte Format
Application
Required when using
μ
-law
Required when using A-law
0
0
1
1
0
1
0
1
No bits inverted
Even bits inverted
Odd bits inverted
All bits inverted
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