WM8581 datasheet(49/100 Pages) WOLFSON

49 / 100 page

Production Data

WM8581

PD Rev 4.0 April 2007

MANUAL CLOCK SELECTION

It is possible to override all default clocking configuration restrictions by setting CLKSEL_MAN. When

CLKSEL_MAN is set, default clocking configurations such as automatic selection of PLLACLK for

DAC1 when DACSRC=00 (S/PDIF received data) are not applied. Instead, clock selection is

determined only by the relevant CLK_SEL register.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

CLKSEL

08h

CLKSEL_MAN

Clock selection auto-configuration

override

0 = auto-configuration enabled,

clock configuration follows

restrictions described in page 43

to page 48.

1 = auto-configuration disabled,

clock configuration follows

relevant CLKSEL bits in R8 to

R11.

Table 38 Manual Clock Selection

PHASE-LOCKED LOOPS AND S/PDIF CLOCKING (SOFTWARE MODE)

The WM8581 is equipped with two independent phase-locked loop clock generators and a

comprehensive clocking scheme which provides maximum flexibility and function and many

configurable routing possibilities for the user in software mode. An overview of the software mode

clocking scheme is shown in Figure 32.

Figure 32 PLL and Clock Select Circuit

WM8581 Datasheet(PDF) 49 Page - Wolfson Microelectronics plc