WM8994ECSSLASHR datasheet(220/363 Pages) CIRRUS

220 / 363 page

WM8994

220

Rev 4.6

WSEQ_DATA_STARTn is a 4-bit field which identifies the LSB position within the selected Control

select bit 4 as the LSB position; in this case, 4-bit data would be written to bits 7:4.

WSEQ_DATA_WIDTHn is a 3-bit field which identifies the width of the data block to be written. This

enables selected portions of a Control Register to be updated without any concern for other bits within

the same register, eliminating the need for read-modify-write procedures. Values of 0 to 7 correspond

to data widths of 1 to 8 respectively. For example, setting WSEQ_DATA_WIDTHn = 010 will cause a

3-bit data block to be written. Note that the maximum value of this field corresponds to an 8-bit data

block; writing to register fields greater than 8 bits wide must be performed using two separate

operations of the Control Write Sequencer.

WSEQ_DELAYn is a 4-bit field which controls the waiting time between the current step and the next

step in the sequence i.e. the delay occurs after the write in which it was called. The total delay time

per step (including execution) is defined below, giving a useful range of execution/delay times from

562

s up to 2.048s per step:

T = k × (2 WSEQ_DELAY + 8)

where k = 62.5

s (under recommended operating conditions)

WSEQ_EOSn is a 1-bit field which indicates the End of Sequence. If this bit is set, then the Control

Write Sequencer will automatically stop after this step has been executed.

The register definitions for Step 0 are described in Table 122. The equivalent definitions also apply to

Step 1 through to Step 127, in the subsequent register address locations.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R12288

(3000h)

Write

Sequencer 0

13:0

WSEQ_ADDR

0 [13:0]

0000h

Control Register Address to be written to

in this sequence step.

R12289

(3001h)

Write

Sequencer 1

7:0

WSEQ_DATA

0 [7:0]

00h

Data to be written in this sequence step.

When the data width is less than 8 bits,

then one or more of the MSBs of

WSEQ_DATAn are ignored. It is

recommended that unused bits be set to

R12290

(3002h)

Write

Sequencer 2

10:8

WSEQ_DATA

_WIDTH0 [2:0]

000

Width of the data block written in this

sequence step.

000 = 1 bit

001 = 2 bits

010 = 3 bits

011 = 4 bits

100 = 5 bits

101 = 6 bits

110 = 7 bits

111 = 8 bits

3:0

WSEQ_DATA

_START0 [3:0]

0000

Bit position of the LSB of the data block

written in this sequence step.

0000 = Bit 0

…

1111 = Bit 15

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