WM8912 datasheet(84/128 Pages) WOLFSON

84 / 128 page

WM8912

Production Data

PD, Rev 4.0, September 2010

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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 31 = RAM addresses

32 to 48 = ROM addresses

49 to 63 = Reserved

R112 (70h)

Write

Sequencer 4

9:4

WSEQ_CURRE

NT_INDEX [5:0]

00_0000

Sequence Current Index (read only):

This is the location of the most

recently accessed command in the

write sequencer memory.

WSEQ_BUSY

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.

Table 56 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

57.

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

WSEQ_WRITE_INDEX field. The values 0 to 31 correspond to all the available RAM addresses

within the Write Sequencer memory. (Note that memory addresses 32 to 48 also exist, but these are

ROM addresses, which are not programmable.)

Having set the Index as described above, Register R109 must be written to (containing the Control

Also, Register R110 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

data to be written to bit 4. With this setting, 4-bit data would be written to bits 7:4 and so on.

WSEQ_DATA_WIDTH 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_WIDTH = 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.

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