WM8581SEFT Wolfson Microelectronics Ltd., WM8581SEFT Datasheet - Page 22

• Manufacturer Part Number: WM8581SEFT
• Description: Multichannel Codec with S/pdif Transceiver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8581
DIGITAL AUDIO INTERFACES
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SOFTWARE REGISTER RESET
Writing to register R53 will cause a register reset, resetting all register bits to their default values.
Note that the WM8581 is powered down by default so writing to this register will power down the
device.
Audio data is transferred to and from the WM8581 via the Digital Audio Interfaces. There are two Receive
Audio Interfaces and two Transmit Audio Interfaces. The Digital Routing options for these interfaces are
described on page 24. Control of the audio interfaces is described below.
MASTER AND SLAVE MODES
The Audio Interfaces require both a left-right-clock (LRCLK) and a bit-clock (BCLK). These can be supplied
externally (slave mode) or they can be generated internally (master mode). When in master mode, the
BCLKs and LRCLKs for an interface are output on the corresponding BCLK and LRCLK pins. By default, all
interfaces operate in slave mode, but can operate in master mode by setting the PAIFTXMS, PAIFRXMS,
SAIFMS register bits. In Hardware Control Mode, the PAIF Transmitter can operate in master mode by
setting the SDI pin.
Table 11 Software Reset
REGISTER
ADDRESS
RESET
R53
35h
Figure 12 Slave Mode
Figure 13 Master Mode
BIT
8:0
LABEL
RESET
DEFAULT
n/a
Writing any data value to this register
will apply a reset to the device
registers.
DESCRIPTION
PP Rev 1.0 March 2006
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