WM8281ECSSLASHR datasheet(81/392 Pages) CIRRUS

81 / 392 page

WM8281

Rev 4.0

GPIO Outputs from DRC

The Dynamic Range Control (DRC) circuit provides a number of status outputs, which can be output

directly on a GPIO pin as an external indication of the DRC Status.

See “General Purpose Input /

Output

” to configure a GPIO pin for these functions.

Each of the DRC status outputs is described below.

The DRC Signal Detect flag indicates that a signal is present on the respective signal path. The

threshold level for signal detection is configurable using the register fields are described in Table 15

and Table 16.

The DRC Anti-Clip flag indicates that the DRC Anti-Clip function has been triggered. In this event, the

DRC gain is decreasing in response to a rising signal level. The flag is asserted until the DRC gain

stablises.

The DRC Decay flag indicates that the DRC gain is increasing in response to a low level signal input.

The flag is asserted until the DRC gain stabilises.

The DRC Noise Gate flag indicates that the DRC Noise Gate function has been triggered, indicating

that an idle condition has been detected in the signal path.

The DRC Quick Release flag indicates that the DRC Quick Release function has been triggered. In

this event, the DRC gain is increasing rapidly following detection of a short transient peak. The flag is

asserted until the DRC gain stabilises.

DRC Register Controls

The DRC control registers are described in Table 15 and Table 16 for DRC1 and DRC2 respectively.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3585

(0E01h)

FX_Ctrl2

15:4

FX_STS [11:0]

00h

LHPF, DRC, EQ Enable Status

Indicates the status of each of the

respective signal processing

functions.

[11] = EQ4

[10] = EQ3

[9] = EQ2

[8] = EQ1

[7] = DRC2 (Right)

[6] = DRC2 (Left)

[5] = DRC1 (Right)

[4] = DRC1 (Left)

[3] = LHPF4

[2] = LHPF3

[1] = LHPF2

[0] = LHPF1

Each bit is coded as:

0 = Disabled

1 = Enabled

R3712

(0E80h)

DRC1 ctrl1

15:11

DRC1_SIG_DET

_RMS [4:0]

00h

DRC1 Signal Detect RMS

Threshold.

This is the RMS signal level for

signal detect to be indicated when

DRC1_SIG_DET_MODE=1.

00h = -30dB

01h = -31.5dB

…. (1.5dB steps)

1Eh = -75dB

1Fh = -76.5dB

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