WM9704CFTSLASHV datasheet(15/37 Pages) WOLFSON

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Production Data

WM9704M

WOLFSON MICROELECTRONICS LTD

PD Rev 3.2 January 2001

REV 2.1 MODE (00)

MODEM MODE (11)

PGA

CONTROL

REG

MUTE DEFAULT

CONTROL

REG

MUTE DEFAULT

Front DAC

PGA

18h

Muted (bit15)

AND with 38h,7,15

AND with 36h,7,15

18h

Muted (bit15)

AND with 38h,7,15

AND with 36h,7,15

Rear DAC

PGA

70h

Muted (bit15)

and powered off

70h

AND with 04h, 15

Front Mixer

72h

Not-muted (bit15)

72h

Not-muted (bit15)

Rear Mixer

74h

Permanently muted

74h

Permanently muted

Front

Volume

02h

38h

36h

Muted (15)

muted (7 and 15)

02h

38h

36h

Muted (15)

muted (7 and 15)

Rear

Volume

04h

Muted (bit15) Rev 2.1

switch enabled

04h

Muted (bit 15)

Table 4 Gain Control Register Location Versus Mode and ID

MASTER/SLAVE ID0/1 SUPPORT

WM9704M supports operation as either a master or a slave codec. Configuration of the device as

either a master or as a slave, is selected by tying the ID pins CID0 and CID1, pins 45 and 46 on the

package.

Fundamentally, a device identified as a master (ID = 00) produces BITCLK as an output, whereas a

slave (any other ID) must be provided with BITCLK as an input. This has the obvious implication that

if the master device on an AC link is disabled, the slave devices cannot function.

The AC’97 Rev 2.1 specification defines that the ID pins have inverting sense, and are provided with

internal weak pull ups. Therefore, if no connections are made to the CID0/1 pins, then the pins pull

‘hi’ and an ID = 00 is selected, i.e. ‘master’. External connects to ground will select other IDs.

PIN46 CID1

PIN45 CID0

ID SELECTED

MASTER OR SLAVE

BITCLK

Master

Output

Ground

Slave

Input

Ground

Slave

Input

Ground

Slave

Input

Table 5 ID Selection

WM9704M supports the AMAP function whereby selection of an ID will automatically map the data

from the interface onto the PCM DACs.

AC–LINK FRAME DATA

USED FOR DACS

CODEC

PCM left DAC uses

data from slot #

PCM right DAC uses

data from slot #

COMMENTS

Original definition (master)

Original definition (docking)

The codec ID is available to the controller via registers 28h and 3c, bits D15 and D14

Table 6 Default Slot to DAC Mappings Based on Codec ID

WM9704CFT/V Datasheet(PDF) 15 Page - Wolfson Microelectronics plc

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