參數(shù)資料
型號(hào)： WM9703
廠商： Wolfson Microelectronics
英文描述： TVS UNIDIRECT 400W 22V SMA
中文描述： AC97音頻編解碼器2.1版
文件頁數(shù)： 24/30頁
文件大?。?/td> 239K
代理商： WM9703
WM9703
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 3.4 January 2001
24
RESERVED REGISTER (INDEX 24h)
This register was originally specified to control what sample rate AC
’
97 is sending or receiving
samples for the optional modem in and out. Not supported by the WM9703.
POWERDOWN CONTROL/STATUS REGISTER (INDEX 26h)
This read/write register is used to program powerdown states and monitor subsystem readiness. The
lower half of this register is read only status, a 1 indicating that the subsection is
ready
.
Ready
is
defined as the subsection able to perform in its nominal state. When this register is written the bit
values that come in on AC-link will have no effect on read only bits 0 to7.
When the AC-link Codec Ready indicator bit (SDATA_IN slot 0, bit 15) is a 1 it indicates that the AC-
link and the WM9703 control and status registers are in a fully operational state. The AC
’
97 controller
must further probe this Powerdown Control/Status Register to determine exactly which subsections,
if any, are ready.
READ BIT
REF
ANL
DAC
ADC
FUNCTION
VREFs up to nominal level
Analogue mixers, etc ready
DAC section ready to accept data
ADC section ready to transmit data
Table 16 Powerdown Status Register Function
The powerdown modes are as follows. The first three bits are to be used individually rather than in
combination with each other. The last bit PR3 can be used in combination with PR2 or by itself. PR0
and PR1 control the PCM ADCs and DACs only. PR6 is not supported by the WM9703.
WRITE BIT
PR0
PR1
PR2
FUNCTION
PCM in ADCs and input Mux powerdown
PCM out DACs powerdown
Analogue mixer powerdown
(VREF still on)
Analogue mixer powerdown (VREF off)
Digital interface (AC-link) powerdown
(external clock off)
Internal clock disable
HP amp powerdown
–
not supported
External amplifier powerdown
PR3
PR4
PR5
PR6
EAPD
Table 17 Powerdown Control Register Function
PR0 = 1
PR1 = 1
PR2 = 1
PR4 = 1
PR0 = 0 AND
ADC = 1
DEFAULT
READY = 1
COLD RESET
WARM
RESET
PR2 = 0 AND
ANL = 1
PR1 = 0 AND
DAC = 1
ADCs OFF
PR0
DACs OFF
PR1
ANALOGUE
OFF PR2 OR
PR3
DIGITAL I/F
OFF PR4
SHUT OFF
CODA LINK
NORMAL
Figure 17 An Example of the WM9703 Powerdown/Powerup Flow
相關(guān)PDF資料
PDF描述
WM9712L AC97 Audio and Touchpanel CODEC
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WM9712LEFT AC97 Audio and Touchpanel CODEC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
WM9703CFT/V 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Revision 2.1 Audio Codec
WM9704CFT/V 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:4-Channel Surround Sound Codec
WM9704M 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AMC97 Audio and Modem Codec
WM9704Q 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:4-Channel Surround Sound Codec
WM9705 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Multimedia AC97 CODEC with Integrated Touch Screen Controller
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