WM9093ECSSLASHR datasheet(41/84 Pages) WOLFSON

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Production Data

WM9093

PD, March 2012, Rev 4.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R70 (46h)

Write

Sequencer 0

WSEQ_ENA

Write Sequencer Enable

0 = Disabled

1 = Enabled

R73 (49h)

Write

Sequencer 3

WSEQ_ABORT

Writing a 1 to this bit aborts the

current sequence and returns control

of the device back to the serial

control interface.

WSEQ_START

Writing a 1 to this bit starts the write

sequencer at the memory location

indicated by the

WSEQ_START_INDEX field. The

sequence continues until it reaches

an “End of sequence” flag. At the end

of the sequence, this bit will be reset

by the Write Sequencer.

5:0

WSEQ_START_

INDEX [5:0]

00_0000

Sequence Start Index. This is the

memory location of the first command

in the selected sequence.

0 to 15 = RAM addresses

16 to 58 = ROM addresses

59 to 63 = Reserved

R74 (4Ah)

Write

Sequencer 4

WSEQ_BUSY

(read only)

Sequencer Busy flag (Read Only).

0 = Sequencer idle

1 = Sequencer busy

Note: it is not possible to write to

control registers via the control

interface while the Sequencer is

Busy.

R75 (4Bh)

Write

Sequencer 5

5:0

WSEQ_CURRE

NT_INDEX [5:0]

(read only)

00_0000

Sequence Current Index. This is the

location of the most recently

accessed command in the write

sequencer memory.

Table 19 Write Sequencer Control – Initiating a Sequence

PROGRAMMING A SEQUENCE

A sequence consists of write operations to data bits (or groups of bits) within the control registers.

The Register fields associated with programming the Control Write Sequencer are described in Table

20.

For each step of the sequence being programmed, the Sequencer Index must be written to the

WSEQ_WRITE_INDEX field. The values 0 to 15 correspond to all the available RAM addresses

within the Write Sequencer memory. (Note that memory addresses 16 to 58 also exist, but these are

ROM addresses, which are not programmable.)

Having set the Index as described above, Register R71 must be written to (containing the Control

Also, Register R72 must be written to (containing the Register Data, the End of Sequence flag and

the Delay time required after this step is executed). After writing to these two registers, the next step

in the sequence may be programmed by updating WSEQ_WRITE_INDEX and repeating the

procedure.

WSEQ_ADDR is an 8-bit field containing the Control Register Address in which the data should be

written.

WSEQ_DATA_START 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 and so on.

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