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參數(shù)資料
| 型號： | LC78625 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs |
| 中文描述： | SigmaDSP的28-/56-Bit音頻處理器雙ADC和4個DAC |
| 文件頁數(shù)： | 26/35頁 |
| 文件大?。?/td> | 440K |
| 代理商： | LC78625 |
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No. 5502-26/35
LC78625E
21. Digital output circuit; Pin 56: DOUT
This is an output pin for use with a digital audio interface. Data is output in the EIAJ format. This signal has been
processed by the interpolation and muting circuits. This pin has a built-in driver circuit and can directly drive a
transformer.
The DOUT pin can be locked at the low level by issuing a DOUT OFF command.
The UBIT information in the DOUT data can be locked at zero by issuing a UBIT OFF command.
The DOUT data can be switched to data for which interpolation and muting processing have not been performed by
issuing a CD-ROM XA command.
22. Antishock mode; Pin 38: ASDACK, pin 39: ASDFIN, pin 40: ASDEPC, pin 41: ADLRCK, pin 42: LRSY, pin 43:
CK2, pin 44: ROMXA, pin 45: C2F
Antishock mode is a mode in which antishock processing is applied to data that has been output once. That data can
be returned and output once again as an audio playback signal. It is also possible to use only the audio playback
block (the attenuator, 8x oversampling digital filter, and one-bit D/A converter circuits) and thus share the audio
playback block with other systems by synchronizing the other system with this LSI's clock.
Note that de-emphasis on/off switching is controlled by the level applied to the ASDEPC pin. De-emphasis is
turned on by a high level.
The ASDACK (pin 38), ASDFIN (pin 39), ASDEPC (pin 40), and ASLRCK (pin 41) pins can be used as general-
purpose ports (see page 23) if this mode is not used.
It is possible to input the signals from the ROMXA (pin 44), C2F (pin 45), LRSY (pin 42), and CK2 (pin 43) pins
to an antishock LSI (the Sanyo LC89151) and re-input the signals output by the antishock LSI to the ASDFIN (pin
39), ASLRCK (pin 41), and ASDACK (pin 38) pins. These signals are then processed by the attenuator, 8x
oversampling digital filter, and one-bit D/A converter circuits and output as audio signals.
In antishock systems, the signal-processing block must operate in double-speed playback mode for data output to
the antishock LSI, and the audio playback block (the attenuator, 8x oversampling digital filter, and one-bit D/A
converter circuits) must operate at normal speed. This means that the control microprocessor must issue both the
ANTIC on command ($6C) as well as the DF normal speed on command ($6F).
The ANTIC off command ($6B) clears antishock mode.
Code
COMMAND
RES = L
$42
DOUT ON
G
G
$43
DOUT OFF
$40
UBIT ON
G
G
$41
UBIT OFF
Code
COMMAND
RES = L
$6C
ANTIC ON
$6B
ANTIC OFF
G
G
$6F
DF normal speed on (only in antishock mode)
$6E
DF normal speed off (only in antishock mode)
G
G
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