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WM9713 数据表(PDF) 40 Page - Wolfson Microelectronics plc

部件名 WM9713
功能描述  AC 97 AUDIO TOUCHPANEL CODEC
PDF  111 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM9713 数据表(HTML) 40 Page - Wolfson Microelectronics plc

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WM9713L
Preliminary Technical Data
1
PTD, March 2004, Rev 2.2
40
VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION
By using an AC’97 Rev2.2 compliant audio interface, the WM9713L can record and playback at all
commonly used audio sample rates, and offer full split-rate support (i.e. the DAC, ADC and
AUXDAC sample rates are completely independent of each other – any combination is possible).
The default sample rate is 48kHz. If the VRA bit in register 2Ah is set, then other sample rates can
be selected by writing to registers 2Ch, 32h and 2Eh. The AC-Link continues to run at 48k frames per
second irrespective of the sample rate selected. However, if the sample rate is less than 48kHz, then
some frames do not carry an audio sample.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
2Ah
Extended
Audio
Stat/Ctrl
0
VRA
0 (OFF)
Variable Rate Audio
0: OFF (DAC and ADC run at 48kHz)
1: ON (sample rates determined by
registers 2Ch and 32h)
2Ch
Audio DAC
Sample Rate
15:0
DACSR
BB80h
(48kHz)
Audio DAC sample rate
1F40h: 8kHz
2B11h: 11.025kHz
2EE0h: 12kHz
3E80h: 16kHz
5622h: 22.05kHz
5DC0h: 24kHz
7D00h: 32kHz
AC44h: 44.1kHz
BB80h: 48kHz
Any other value defaults to the nearest
supported sample rate
32h
Audio ADC
Sample Rate
15:0
ADCSR
BB80h
(48kHz)
Audio ADC sample rate
similar to DACSR
2Eh
AUXDAC
Sample Rate
15:0
AUXDA
CSR
BB80h
(48kHz)
AUXDAC sample rate
similar to DACSR
Table 20 Audio Sample Rate Control



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