WM9712L datasheet(34/77 Pages) WOLFSON

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WM9712L

Production Data

PD Rev 4.5 August 2006

DIGITAL AUDIO (SPDIF) OUTPUT

The WM9712L supports the SPDIF standard using pin 47 as its output. Note that pin 47 can also be

used as a GPIO pin. The GE5 bit (register 56h, bit 5) selects between GPIO and SPDIF functionality

(see “GPIO and Interrupt control” section).

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 SPDIF transmitter is disabled (SPDIF 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 SPDIF validity bit SPCV in register 2Ah

should be read to ensure the desired configuration is valid. Only then should the SPDIF enable bit in

beginning of SPDIF transmission.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

SPCV

SPDIF validity bit (read-only)

5:4

SPSA

SPDIF slot assignment (ADCO = 0)

00: Slots 3, 4

01: Slots 6, 9

10: Slots 7, 8

11: Slots 10, 11

2Ah

Extended

Audio

SEN

SPDIF output enable

1 = enabled, 0 = disabled

Validity bit; ‘0’ indicates frame valid, ‘1’

indicates frame not valid

DRS

Indicates that the WM9712L does not support

double rate SPDIF output (read-only)

13:12

SPSR

Indicates that the WM9712L only supports

48kHz sampling on the SPDIF output (read-

only)

Generation level; programmed as required by

user

10:4

0000000

Category code; programmed as required by

user

PRE

Pre-emphasis; ‘0’ indicates no pre-emphasis,

‘1’ indicates 50/15us pre-emphasis

COPY

asserted, ‘1’ indicates copyright

AUDIB

Non-audio; ‘0’ indicates data is PCM, ‘1’

indicates non-PCM format (e.g. DD or DTS)

3Ah

SPDIF

Control

PRO

Professional; ‘0’ indicates consumer, ‘1’

indicates professional

5Ch

Additional

Function

Control

ADCO

Source of SPDIF data

0: SPDIF data comes from SDATAOUT (pin

5), slot selected by SPSA

1: SPDIF data comes from audio ADC

Table 22 SPDIF Output Control

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