WM8581SEFT Wolfson Microelectronics Ltd., WM8581SEFT Datasheet - Page 72

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

WM8581
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PRIMARY AUDIO INTERFACE (TX) MASTER MODE CONTROL
In Hardware Control Mode, the SDIN pin is used to enable the master mode function on the Primary
Audio Interface transmitter. This has the same operation as the PAIFTX_MS register bit. The
PAIFTX_RATE default settings of 256fs, and 64 BCLKs/LRCLK for BCLKSEL, are used in Hardware
Control Mode. See page Error! Bookmark not defined. for more information on master mode
operation.
Table 74 Audio Interface (Transmitter) Master Mode Hardware Mode Control
S/PDIF ERROR HANDLING
Should the incoming S/PDIF sub-frame contain a parity error or a bi-phase encoding error, it is
assumed the sub-frame has become corrupted. Similarly, if VALIDITY is detected as 1, it is assumed
the data within the S/PDIF frame is invalid. Under these conditions, the S/PDIF Receiver repeats the
last valid sample in place of the corrupted/invalid samples. (Note: For the S/PDIF receiver to S/PDIF
transmitter path, only VALIDITY errors will cause data to be overwritten – parity and bi-phase errors
have will not cause data to be overwritten).
POWERDOWN CONTROL
In Software Control Mode, the device is powered-down by default. In Hardware Control Mode, the
chip is powered-up by default but can be powered up by setting the ALLPD(MFP7) input high. (Note
that in Software Control Mode, this pin takes the function of SAIF_LRCLK or GPO7).
Table 75 Hardware Mode Powerdown Control
Powerup
0
ALLPD (MFP7)
SDIN
0
1
Powerdown
1
AUDIO INTERFACE (TX)
Master
Slave
PP Rev 1.0 March 2006
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