WM8718

Production Data

w

PD Rev 4.1 March 2004

19

ATTENUATOR CONTROL MODE

Setting the ATC register bit causes the left channel attenuation settings to be applied to both left

and right channel DACs from the next audio input sample. No update to the attenuation registers

is required for ATC to take effect. (The right channels registry settings are preserved.)

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0011

PCM Control

5

ATC

0

Attenuator Control Mode:

0:

Right channels use Right

attenuation

1:

Right Channels use Left

Attenuation

Table 8 Attenuation Control Select

BCKIN POLARITY

By default, LRCIN and DIN are sampled on the rising edge of BCKIN and should ideally change

on the falling edge. Data sources which change LRCIN and DIN on the rising edge of BCKIN can

be supported by setting the BCP register bit. Setting BCP to 1 inverts the polarity of BCKIN to the

inverse of that shown in Figure 4, Figure 5, Figure 6, Figure 7 and Figure 8

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0011

PCM Control

6

BCP

0

BCKIN

0: normal polarity

1: inverted polarity

Table 9 BCKIN Polarity Control

OUTPUT PHASE REVERSAL

The REV register bit controls the phase of the output signal. Setting the REV bit causes the

phase of the output signal to be inverted.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0011

PCM Control

7

REV

0

Analogue Output Phase

0: Normal

1: Inverted

Table 10 Output Phase Control