WM8281ECSSLASHR datasheet(297/392 Pages) CIRRUS

297 / 392 page

WM8281

Rev 4.0

297

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

8:0

WSEQ_START_I

NDEX [8:0]

000h

Sequence Start Index

This field contains the index location in

the sequencer memory of the first

command in the selected sequence.

Only applies to sequences triggered

using the WSEQ_START bit.

Valid from 0 to 509 (1FDh).

Table 116 Write Sequencer Control - Initiating a Sequence

AUTOMATIC SAMPLE RATE DETECTION SEQUENCES

The WM8281 supports automatic sample rate detection on the digital audio interfaces (AIF1, AIF2

and AIF3), when operating in AIF Slave mode. Automatic sample rate detection is enabled using the

RATE_EST_ENA register bit (see Table 101).

Up to four audio sample rates can be configured for automatic detection; these sample rates are

selected using the SAMPLE_RATE_DETECT_n registers. If one of the selected audio sample rates is

detected, then the Control Write Sequencer will be triggered. The applicable start index location within

the sequencer memory is separately configurable for each detected sample rate.

The WSEQ_SAMPLE_RATE_DETECT_A_INDEX register defines the sequencer start index

corresponding to the SAMPLE_RATE_DETECT_A sample rate. Equivalent start index values are

defined for the other sample rates, as described in Table 117.

Note that a sequencer start index of 1FFh will cause the respective sequence to be aborted.

The automatic sample rate detection control sequences are undefined following Power-On Reset

(POR), but can be user-programmed after power-up. Note that all control sequences are maintained

in the sequencer memory through Hardware Reset, Software Reset and in Sleep mode.

See “Clocking and Sample Rates” for further details of the automatic sample rate detection function.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R97

(0061h)

Sample

Rate

Sequence

Select 1

8:0

WSEQ_SAMPLE

_RATE_DETECT

_A_INDEX [8:0]

1FFh

Sample Rate A Write Sequence start

index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with Sample Rate A detection.

Valid from 0 to 509 (1FDh)

R98

(0062h)

Sample

Rate

Sequence

Select 2

8:0

WSEQ_SAMPLE

_RATE_DETECT

_B_INDEX [8:0]

1FFh

Sample Rate B Write Sequence start

index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with Sample Rate B detection.

Valid from 0 to 509 (1FDh)

R99

(0063h)

Sample

Rate

Sequence

Select 3

8:0

WSEQ_SAMPLE

_RATE_DETECT

_C_INDEX [8:0]

1FFh

Sample Rate C Write Sequence start

index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with Sample Rate C detection.

Valid from 0 to 509 (1FDh)

R100

(0064h)

Sample

Rate

Sequence

Select 4

8:0

WSEQ_SAMPLE

_RATE_DETECT

_D_INDEX [8:0]

1FFh

Sample Rate D Write Sequence start

index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with Sample Rate D detection.

Valid from 0 to 509 (1FDh)

Table 117 Write Sequencer Control - Automatic Sample Rate Detection

WM8281ECS/R Datenblatt(PDF) 297 Page - Cirrus Logic

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