WM8994ECSSLASHR datasheet(181/363 Pages) CIRRUS

181 / 363 page

WM8994

Rev 4.6

181

AIF2 - MASTER / SLAVE AND TRI-STATE CONTROL

The Digital Audio Interface AIF2 can operate in Master or Slave modes, selected by AIF2_MSTR. In

Master mode, the BCLK2 and LRCLK2 signals are generated by the WM8994 when one or more AIF2

channels is enabled.

When AIF2_LRCLK_FRC or AIF2_CLK_FRC is set in Master mode, then LRCLK2 and ADCLRCLK2

are output at all times, including when none of the AIF2 audio channels is enabled. Note that LRCLK2

and ADCLRCLK2 are derived from BCLK2, and either an internal or external BCLK2 signal must also

be present to generate LRCLK2 or ADCLRCLK2.

When AIF2_CLK_FRC is set in Master mode, then BCLK2 is output at all times, including when none

of the AIF2 audio channels is enabled.

Note that the AIF2 pins are also GPIO pins, whose function is configurable. These pins must be

configured as AIF functions when used as audio interface pins. See “General Purpose Input/Output”.

The AIF2 interface can be tri-stated by setting the AIF2_TRI register. When this bit is set, then all of

the AIF2 outputs are un-driven (high-impedance). The AIF2_TRI register only affects those pins which

are configured for AIF2 functions; it does not affect pins which are configured for other functions.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R786 (0312h)

AIF2

Master/Slave

AIF2_TRI

AIF2 Audio Interface tri-state

0 = AIF2 pins operate normally

1 = Tri-state all AIF2 interface pins

Note that pins not configured as AIF2

functions are not affected by this register.

AIF2_MSTR

AIF2 Audio Interface Master Mode Select

0 = Slave mode

1 = Master mode

AIF2_CLK_F

Forces BCLK2, LRCLK2 and ADCLRCLK2 to

be enabled when all AIF2 audio channels are

disabled.

0 = Normal

1 = BCLK2, LRCLK2 and ADCLRCLK2

always enabled in Master mode

AIF2_LRCL

K_FRC

Forces LRCLK2 and ADCLRCLK2 to be

enabled when all AIF2 audio channels are

disabled.

0 = Normal

1 = LRCLK2 and ADCLRCLK2 always

enabled in Master mode

Table 95 AIF2 Master / Slave and Tri-state Control

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