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參數資料
| 型號： | W9320 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 編解碼器 |
| 英文描述： | ADPCM Codec(ADPCM編解碼器) |
| 中文描述： | A/MU-LAW, ADPCM CODEC |
| 文件頁數： | 6/35頁 |
| 文件大小： | 444K |
| 代理商： | W9320 |
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W9320
- 6 -
4.4 Serial Setup Port(SSP) Interface, continued
PIN NAME
PIN NO.
I/O
FUNCTION
SSP CLK
15
I
This pin is the clock for SSP setup. Note that data is shifted out of
the SSP on the falling edge of this pin, and shifted into the SSP on
the rising edge. The SSP CLK can be any frequency from 0 to 2048
KHz.
SSP TX
16
O
This pin is the tri-state output data for SSP transmission controlled
by the SSP CLK pin (pin-15).
SSP RX
17
I
This pin is the receive input data for the SSP controlled by the SSP
CLK pin (pin-15).
5. SYSTEM DIAGRAM
5.1 Pair Gain System
Applications for this device include the public switching telephone system. One such application is the
pair gain system shown in Figure 5-1. The figure illustrates how the chip is used in a pair gain system
to connect the telephone system between end users and the central office terminal. These chips are
used on devices installed in both the central office terminal (COT) and in the remote office terminal
(ROT). If the chip is operating in 32 Kbps ADPCM mode, the COT and ROT must use four chips for
4-channel communication because the U interface chip can support 2B channel, i.e., 128K bps.
In the transmission path, the telephone system first sends the analog signal to the ADPCM chip in the
ROT to compress it into a 32 Kbps digital signal. The U interface can then build a 2B+D channel, 128
Kbps, with four ADPCM chip channels, and send the 128 Kbps digital signal to the COT. After
receiving the digital signal, the U interface in the COT separates the 128 Kbps data into four ADPCM
channels (32 Kbps) and sends this data to the chip to execute the ADPCM decoder and for
reconstruction into an analog signal. The analog signal is then sent to the central office (CO) to
complete the transmission operation.
For the receive path it is the reverse operation of the transmission path mentioned above.
In a pair gain system, the analog signal (voice signal, or modem signal) is digitized and compressed
to a ADPCM signal e.g. 32 Kbps ADPCM. The subscriber loop, the connection between the end user
and the central office, is digitized by the U interface transceiver. This provides two B-channels (2
×
64
Kbps) for data and one D channel for signaling. In short, data can be transmitted and received on the
subscriber loop via the U interface transceiver. One B-channel can carry 64 Kbps data, i.e. two 32
Kbps ADPCM channels. Therefore the pair gain system can supply four telephones
.
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