WM8281ECSSLASHR datasheet(300/392 Pages) CIRRUS

300 / 392 page

WM8281

300

Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R110

(006Eh)

Trigger

Sequence

Select 32

8:0

WSEQ_DRC1_SI

G_DET_RISE_IN

DEX [8:0]

1FFh

DRC1 Signal Detect (Rising) Write

Sequence start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with DRC1 Signal Detect (Rising)

detection.

Valid from 0 to 509 (1FDh).

R111

(006Fh)

Trigger

Sequence

Select 33

8:0

WSEQ_DRC1_SI

G_DET_FALL_IN

DEX [8:0]

1FFh

DRC1 Signal Detect (Falling) Write

Sequence start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with DRC1 Signal Detect (Falling)

detection.

Valid from 0 to 509 (1FDh).

Table 119 Write Sequencer Control - DRC Signal Detect

BOOT SEQUENCE

The WM8281 executes a Boot Sequence following Power-On Reset (POR), Hardware Reset,

Software Reset or Wake-Up (from Sleep mode).

See “Power-On Reset (POR)” and “Hardware Reset, Software Reset, Wake-Up, and Device ID” for

further details.

The Boot Sequence configures the WM8281 with factory-set trim (calibration) data. Space is allocated

within the Boot Sequence memory to allow user-configurable register operations to be added (eg. to

automatically enable SYSCLK as part of the Boot Sequence). Further details of the sequencer

memory are provided later in this section. Note that all control sequences are maintained in the

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

If the Boot Sequence is programmed to enable SYSCLK, note that the default SYSCLK frequency

must be used. If a different SYSCLK frequency is required, this must be configured after the Boot

Sequence has completed.

The start index location of the the Boot Sequence is 384 (180h). Index locations 384 (180h) to 399

(18Fh) are available for any user-configured Boot Sequence requirements.

The Boot Sequence can be commanded at any time by writing ‘1’ to the WSEQ_BOOT_START bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R24

(0018h)

Write

Sequencer

Ctrl 2

WSEQ_BOOT_S

TART

Writing a 1 to this bit starts the write

sequencer at the index location

configured for the Boot Sequence.

The Boot Sequence start index is 384

(180h).

Table 120 Write Sequencer Control - Boot Sequence

SEQUENCER OUTPUTS AND READBACK

The

status

the

Write

Sequencer

can

read

using

the

WSEQ_BUSY

and

WSEQ_CURRENT_INDEX registers, as described in Table 121.

When the WSEQ_BUSY bit is asserted, this indicates that the Write Sequencer is busy.

The index address of the most recent Write Sequencer command can be read from the

WSEQ_CURRENT_INDEX field. This can be used to provide a precise indication of the Write

Sequencer progress.

WM8281ECS/R Datenblatt(PDF) 300 Page - Cirrus Logic

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