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參數(shù)資料
| 型號： | MSM7731-01 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分類： | Codec |
| 英文描述： | Multifunction PCM CODEC (Voice Signal Processor) |
| 中文描述： | 多功能的PCM編解碼器（語音信號處理器） |
| 文件頁數(shù)： | 12/43頁 |
| 文件大?。?/td> | 247K |
| 代理商： | MSM7731-01 |
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12/43
Semiconductor
MSM7731-01
RST
This input pin resets coefficients of the echo canceler and noise canceler. A logic "0" causes the
reset state to be entered. At this time, the filter coefficients for the echo canceler and noise
canceler are reset. Control register contents are preserved. While reset is being processed, there
is no sound. During normal operation, set this pin to a logic "1". Since this pin is ORed (negative
logic) with the CR0-B6 bit of the control register, set the pin to a logic "1" when controlling by
the control register. Use this pin in cases where the echo path changes (due to line switching
during a telephone conversation, etc.), or when resuming telephone communication. Because
data is shifted into this pin in synchronization with the rising edge of the SYNC signal, hold the
data at the pin for 250
m
s or longer.
For further details, refer to the electrical characteristics.
DEN
, EXCK, DIN, DOUT
This is the serial port for the microcomputer interface. 13 bytes of control registers are provided
in this LSI device. These pins are used to write and read data from an external microcomputer.
The
DEN
pin is an enable signal input pin, the EXCK pin is a clock signal input pin for data
shifting, the DIN pin is an address and data input pin, and the DOUT pin is a data output pin.
If the microcomputer interface is not used, set the
DEN
pin to a logic "1" and the EXCK and DIN
pins to a logic "0". In addition, use the MCUSEL pin to specify the "unused" setting of the
microcomputer interface. Figure 4 shows the input timing.
MCUSEL
This pin selects whether the microcomputer interface is used or unused. A logic "0" specifies
that the microcomputer interface is used and a logic "1" specifies that it is not used. If the
microcomputer interface is not used, this pin must be set to a logic "1". This pin is ORed with
the CR0-B1 bit of the control register.
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