WM8281ECSSLASHR datasheet(176/392 Pages) CIRRUS

176 / 392 page

WM8281

176

Rev 4.0

SLIMBUS CONTROL REGISTER ACCESS

Control register access is supported via the SLIMbus interface. Full read/write access to all registers

is possible, via the “User Value Elements” portion of the Value Map.

two messages may be required, depending on circumstances

: the first “CHANGE_VALUE” message

selects the register page (bits [23:8] of the Control Register address); the second message contains

the data and bits [7:0] of the register address. The first message may be omitted if the register page is

unchanged from the previous Read or Write operation.

The associated parameters are described in Table 54 and Table 55, for the generic case of writing the

value 0xVVVV to control register address 0xYYYYZZ.

Write Message 1

– CHANGE_VALUE

PARAMETER

VALUE

DESCRIPTION

Source Address

0xSS

‘SS’ is the 8-bit Logical Address of the message

source. This could be any active device on the bus,

but is typically the Manager Device (0xFF).

Destination Address

0xLL

‘LL’ is the 8-bit Logical Address of the message

destination (ie. the WM8281 SLIMbus Interface

Device). The value is assigned by the SLIMbus

Manager Device.

Access Mode

0b1

Selects Byte-based access mode.

Byte Address

0x800

Identifies the User Value element for selecting the

Control Register page address.

Slice Size

0b001

Selects 2-byte slice size

Value Update

0xYYYY

‘YYYY’ is bits [23:8] of the applicable Control

Table 54 Register Write Message (1)

Write Message 2

– CHANGE_VALUE

PARAMETER

VALUE

DESCRIPTION

Source Address

0xSS

‘SS’ is the 8-bit Logical Address of the message

source. This could be any active device on the bus,

but is typically the Manager Device (0xFF).

Destination Address

0xLL

‘LL’ is the 8-bit Logical Address of the message

destination (ie. the WM8281 SLIMbus Interface

Device). The value is assigned by the SLIMbus

Manager Device.

Access Mode

0b1

Selects Byte-based access mode.

Byte Address

0xUUU

Specifies the Value Map address, calculated as

0xA00 + (2 x 0xZZ), where ‘ZZ’ is bits [7:0] of the

applicable Control Register address.

Slice Size

0b001

Selects 2-byte slice size

Value Update

0xVVVV

‘VVVV’ is the 16-bit data to be written.

Table 55 Register Write Message (2)

Note that the first message may be omitted if its contents are unchanged from the previous

CHANGE_VALUE message sent to the WM8281.

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