WM8746 datasheet(24/31 Pages) WOLFSON

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WM8746

Advance Information

PP Rev 1.4 November 2001

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:0

L1A[7:0]

11111111

(0dB)

Attenuation level of left channel DACL1 in 0.5dB steps. See Table 8

0000100

Attenuation

DACL1

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store DACL1 in intermediate latch (no change to output)

1: Store DACL1 and update attenuation on all channels.

7:0

R1A[7:0]

11111111

(0dB)

Attenuation level of right channel DACR1 in 0.5dB steps, see Table 8.

0000101

Attenuation

DACR1

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store DACR1 in intermediate latch (no change to output)

1: Store DACR1 and update attenuation on all channels.

7:0

L2A[7:0]

11111111

(0dB)

Attenuation level of left channel DACL2 in 0.5dB steps, see Table 8.

0000110

Attenuation

DACL2

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store DACL2 in intermediate latch (no change to output)

1: Store DACL2 and update attenuation on all channels.

7:0

R2A[7:0]

11111111

(0dB)

Attenuation level of right channel DACR2 in 0.5dB steps, see Table 8.

0000111

Attenuation

DACR2

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store DACR2 in intermediate latch (no change to output)

1: Store DACR2 and update attenuation on all channels.

7:0

MASTA[7:0]

11111111

(0dB)

Attenuation data for all channels in 0.5dB steps, see Table 8.

0001000

Master

Attenuation

(all channels)

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store MASTA[7:0] in all intermediate latches (no change to

output)

1: Store DACR0 and update attenuation on all channels

2SPD

Activates the split rate mode where the front channels run at 192kHz

and the rear four channels run at 96kHz.

0: Normal operation.

1: Split rate operation.

0001001

Extended

interface

control

ZCD

Controls the operation of the zero crossing detect mechanism which

ensures that the volume is only updated on each channel when the

signal passes through midrail.

0: Enable zero detect.

1: Disable zero detect.

Table 13 Register Map Description

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