wm9713 Wolfson Microelectronics plc, wm9713 Datasheet - Page 63

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wm9713

Manufacturer Part Number
wm9713
Description
Ac?97 Audio + Touchpanel Codec
Manufacturer
Wolfson Microelectronics plc
Datasheet

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Pre-Production
DIGITAL AUDIO (S/PDIF) OUTPUT
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The WM9713L supports the S/PDIF standard. Pins 48 & 12 can be used to output the S/PDIF data.
Note that pins 48 & 12 can also be used as GPIO pins. The GE5 & GE8 bits (register 56h, bit 5 & bit
8) select between GPIO and S/PDIF functionality for pins 48 & 12 respectively (see “GPIO and
Interrupt control” section).
Register 3Ah is a read/write register that controls S/PDIF functionality and manages bit fields
propagated as channel status (or sub-frame in the V case). With the exception of V, this register
should only be written to when the S/PDIF transmitter is disabled (S/PDIF bit in register 2Ah is ‘0’).
Once the desired values have been written to this register, the contents should be read back to
ensure that the sample rate in particular is supported, then S/PDIF validity bit SPCV in register 2Ah
should be read to ensure the desired configuration is valid. Only then should the S/PDIF enable bit in
register 2Ah be set. This ensures that control and status information start up correctly at the
beginning of S/PDIF transmission.
PP Rev 3.2 September 2008
WM9713L
63

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