WM9704M データシートの表示（PDF） - Wolfson Microelectronics plc
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WM9704M Datasheet PDF : 37 Pages
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Production Data
WM9704M
REV 2.1 MODE (00)
MODEM MODE (11)
PGA
ID CONTROL
REG
MUTE DEFAULT
CONTROL
REG
MUTE DEFAULT
Front DAC
0x
PGA
10
18h
11
Muted (bit15)
AND with 38h,7,15
AND with 36h,7,15
Muted (bit15)
18h
AND with 38h,7,15
AND with 36h,7,15
Rear DAC
0x
PGA
10
70h
11
Muted (bit15)
and powered off
70h
AND with 04h, 15
0x
Front Mixer 10
72h
11
Not-muted (bit15)
72h
Not-muted (bit15)
0x
Rear Mixer
10
74h
11
Permanently muted
74h
Permanently muted
Front
Volume
0x
02h
10
38h
11
36h
Muted (15)
muted (7 and 15)
muted (7 and 15)
02h
Muted (15)
38h
muted (7 and 15)
36h
muted (7 and 15)
Rear
Volume
0x
10
04h
Muted (bit15) Rev 2.1
switch enabled
04h
11
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
NC
NC
NC
Ground
Ground
NC
Ground
Ground
Table 5 ID Selection
ID SELECTED
00
01
10
11
MASTER OR SLAVE
Master
Slave
Slave
Slave
BITCLK
Output
Input
Input
Input
WM9704M supports the AMAP function whereby selection of an ID will automatically map the data
from the interface onto the PCM DACs.
CODEC
ID
AC–LINK FRAME DATA
USED FOR DACS
PCM left DAC uses
data from slot #
PCM right DAC uses
data from slot #
COMMENTS
00
3
4
Original definition (master)
01
3
4
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
WOLFSON MICROELECTRONICS LTD
PD Rev 3.2 January 2001
15
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