wm8593seft-v Wolfson Microelectronics plc, wm8593seft-v Datasheet - Page 55

• Manufacturer Part Number: wm8593seft-v
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
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Figure 25 Clock Switching Example
If CLK_A in the previous example is not running the logic that controls switching between clocks will
not function. In this case, it is possible to force an update on any individual digital audio port or audio
interface using the relevant force bit. If this functionality is required, the relevant force bit should be
set to ‘1’ and then set back to ‘0’ again.
Example: Switching from MCLK2 to MCLK3 using the MCLK4 pin when MCLK2 is not present
CLK_A is applied to the MCLK2 pin, and CLK_B is applied to the MCLK3 pin.
MCLK4_SEL[2:0]=001, so CLK_A is output on the MCLK4 pin. However, CLK_A is not running. To
change the output clock to CLK_B, set MCLK4_SEL[2:0]=010 and PORT4_FORCE=1. Finally, set
PORT4_FORCE=0 to complete the switch.
Table 41 Audio Interface Mux Force Bits
REGISTER
ADDRESS
AIF_MUX1
AIF_MUX2
AIF_MUX3
AIF_MUX4
AIF_MUX5
AIF_MUX6
AIF_MUX7
AIF_MUX8
R37
R38
R39
R40
R41
R42
2Ah
R43
2Bh
R44
2Ch
25h
26h
27h
28h
29h
BIT
0
0
0
0
0
0
0
0
PORT1_
PORT2_
PORT3_
PORT4_
PORT5_
FORCE
FORCE
FORCE
FORCE
FORCE
FORCE
FORCE
FORCE
LABEL
DAC1_
DAC2_
ADC_
DEFAULT
0
Force Clocks to Change
0 = Wait until clocks are safe before
switching between clock sources
1 = Force clock sources to change
immediately
Note: These bits must be returned to ‘0’
before clocks will be output
DESCRIPTION
PD Rev 4.0 April 2008
WM8593
Initially,
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