WM8998 datasheet(79/307 Pages) WOLFSON

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Production Data

WM8998

PD, October 2014, Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1474

(05C2h)

SPD1 TX

Control

SPD1_VAL2

S/PDIF validity (Subframe B)

SPD1_VAL1

S/PDIF validity (Subframe A)

SPD1_ENA

S/PDIF Generator Enable

0 = Disabled

1 = Enabled

R1475

(05C3h)

SPD1 TX

Channel

Status 1

15:8

SPD1_CATCODE

[7:0]

00h

S/PDIF Category code

7:6

SPD1_CHSTMO

DE [1:0]

S/PDIF Channel Status mode

5:3

SPD1_PREEMPH

[2:0]

000

S/PDIF De-emphasis mode

SPD1_NOCOPY

S/PDIF Copyright status

SPD1_NOAUDIO

S/PDIF Audio / Non-audio indication

SPD1_PRO

S/PDIF Consumer / Professional Mode

R1476

(05C4h)

SPD1 TX

Channel

Status 2

15:12 SPD1_FREQ [3:0]

0000

S/PDIF Indicated sample frequency

11:8

SPD1_CHNUM2

[3:0]

1011

S/PDIF Channel number (Subframe B)

7:4

SPD1_CHNUM1

[3:0]

0000

S/PDIF Channel number (Subframe A)

3:0

SPD1_SRCNUM

[3:0]

0001

S/PDIF Source number

R1477

(05C5h)

SPD1 TX

Channel

Status 3

11:8

SPD1_ORGSAM

P [3:0]

0000

S/PDIF Original sample frequency

7:5

SPD1_TXWL [2:0]

000

S/PDIF Audio sample word length

SPD1_MAXWL

S/PDIF Maximum audio sample word

length

3:2

SPD1_SC31_30

[1:0]

S/PDIF Channel Status [31:30]

1:0

SPD1_CLKACU

[1:0]

Transmitted clock accuracy

Table 15 S/PDIF Output Generator Control

The WM8998 performs automatic checks to confirm that the SYSCLK frequency is high enough to

support the digital mixer paths. If an attempt is made to enable the SPDIF generator, and there are

insufficient SYSCLK cycles to support it, then the attempt will be unsuccessful. (Note that any signal

paths that are already active will not be affected under these circumstances.)

The Overclocked Error condition can be monitored using the GPIO and/or Interrupt functions. See

“General Purpose Input / Output” and “Interrupts” for further details.

The status bits in Registers R1600 to R2920 indicate the status of each of the digital mixers. If an

Underclocked Error condition occurs, then these bits provide readback of which mixer(s) have been

successfully enabled.

WM8998 Datasheet(PDF) 79 Page - Wolfson Microelectronics plc

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