WM8711BL
Production Data
The exact sample rates supported for all combinations are defined by the relationships in Table 15
below.
TARGET
ACTUAL SAMPLING RATE
SAMPLING
RATE
BOSR=0
BOSR=1
(272FS)
kHz
( 250FS)
kHz
kHz
8
8
8.021
12MHz/(250 x 48/8)
32
12MHz/(272 x 11/2)
not available
32
12MHz/(250 x 48/32)
not available
44.1
48
44.117
12MHz/272
not available
48
12MHz/250
not available
88.2
96
88.235
12MHz/136
not available
96
12MHz/125
Table 15 USB Mode Actual Sample Rates
ACTIVATING DSP AND DIGITAL AUDIO INTERFACE
To prevent any communication problems from arising across the Digital Audio Interface is disabled
(tristate with weak 100k pulldown) at power on. Once the Audio Interface and the Sampling Control
has been programmed it is activated by setting the ACTIVE bit under Software Control.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0001001
Active Control
0
ACTIVE
0
Activate Interface
1 = Active
0 = Inactive
Table 16 Activating DSP and Digital Audio Interface
It is recommended that between changing any content of Digital Audio Interface or Sampling Control
Register that the active bit is reset then set.
SOFTWARE CONTROL INTERFACE
The software control interface may be operated using either a 3-wire or 2-wire MPU interface.
Selection of interface format is achieved by setting the state of the MODE pin.
In 3-wire mode, SDIN is used for the program data, SCLK is used to clock in the program data and
CSB is used to latch in the program data. In 2-wire mode, SDIN is used for serial data and SCLK is
used for the serial clock. In 2-wire mode, the state of CSB pin allows the user to select one of two
addresses.
SELECTION OF SERIAL CONTROL MODE
The serial control interface may be selected to operate in either 2 or 3-wire modes. This is achieved
by setting the state of the MODE pin.
MODE
INTERFACE
FORMAT
0
1
2 wire
3 wire
Table 17 Control Interface Mode Selection
PD, Rev 4.1, April 2007
30
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
