WM8281ECSSLASHR datasheet(318/392 Pages) CIRRUS

318 / 392 page

WM8281

318

Rev 4.0

The BOOT_DONE_STS signal is an input to the Interrupt control circuit and can be used to trigger an

Interrupt event - s

ee “Interrupts”.

The BOOT_DONE_STS signal can also generate a GPIO output, providing an external indication of

the Boot Sequence. See “General Purpose Input / Output” to configure a GPIO pin for this function.

For details of the Boot Sequence

, see “Control Write Sequencer”.

The status of the WM8281 digital I/O pins following Hardware Reset, Software Reset or Wake-Up is

described in

the “Power-On Reset (POR)” section.

The Device ID can be read back from Register R0. The Hardware Revision can be read back from

The Software Revision can be read back from Register R2. The Software Revision code is

incremented if software driver compatibility or software feature support is changed.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R0 (0000h)

Software

Reset

15:0

SW_RST_DEV_

ID [15:0]

5110h

Writing to this register resets all registers

to their default state.

Reading from this register will indicate

Device ID 5110h.

R1 (0001h)

Hardware

Revision

7:0

HW_REVISION

[7:0]

Hardware Device revision.

(incremented for every new revision of

the device)

R2 (0002h)

Software

Revision

6:0

SW_REVISION

[6:0]

Software Device revision.

(incremented if software driver

compatibility or software feature support

is changed)

Table 131 Device Reset and ID

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