wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 76

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

WM9714L
POWER MANAGEMENT
INTRODUCTION
AC97 CONTROL REGISTER
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The WM9714L includes the standard power down control register defined by the AC’97 specification
(register 26h). Additionally, it also allows more specific control over the individual blocks of the device
through register Powerdown registers 3Ch and 3Eh. Each particular circuit block is active when both
the relevant bit in register 26h AND the relevant bit in the Powerdown registers 3Ch and 3Eh are set
to ‘0’.
Note that the default power-up condition is all OFF.
Table 59 Powerdown and Status Register (Conforms to AC’97 Rev 2.2)
26h
Powerdown/
Status
register
REGISTER
ADDRESS
14
13
12
11
10
9
8
3
2
1
0
BIT
PR6
PR5
PR4
PR3
PR2
PR1
PR0
REF
ANL
DAC
ADC
LABEL
1
(disabled)
1
(disabled)
1
(disabled)
1
(disabled)
1
(disabled)
1
(disabled)
1
(disabled)
0
0
0
0
DEFAULT
Output PGAs Disable Control
1 = Disabled
0 = Enabled
Internal Clock Disable Control
1 = Disabled
0 = Enabled
AC-Link Disable Control
1 = Disabled
0 = Enabled
Analogue Disable Control
1 = Disabled
0 = Enabled
Note: This control disables VREF, input PGAs,
DACs, ADCs, mixers and outputs
Input PGAs and Mixers Disable Control
1 = Disabled
0 = Enabled
Stereo DAC Disable Control
1 = Disabled
0 = Enabled
Stereo ADC and Record Mux Disable Control
1 = Disabled
0 = Enabled
VREF Ready (Read Only)
1 = VREF ready
0 = VREF not ready
Analogue Mixers Ready (Read Only)
1 = Analogue mixers ready
0 = Analogue mixers not ready
Stereo DAC Ready (Read Only)
1 = DAC ready
0 = DAC not ready
Stereo ADC Ready (Read Only)
1 = ADC ready
0 = ADC not ready
DESCRIPTION
PP, Rev 3.2, October 2008
Pre-Production
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