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WM8593 Datasheet(PDF) 52 Page - Wolfson Microelectronics plc

Part # WM8593
Description  24-bit 192kHz 2Vrms Multi-Channel CODEC
PDF  98 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8593 Datasheet(HTML) 52 Page - Wolfson Microelectronics plc

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PP Rev 1.0 January 2007
52
Figure 23 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.
Initially,
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.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R37
AIF_MUX1
25h
0
PORT1_
FORCE
R38
AIF_MUX2
26h
0
PORT2_
FORCE
R39
AIF_MUX3
27h
0
PORT3_
FORCE
R40
AIF_MUX4
28h
0
PORT4_
FORCE
R41
AIF_MUX5
29h
0
PORT5_
FORCE
R42
AIF_MUX6
2Ah
0
DAC1_
FORCE
R43
AIF_MUX7
2Bh
0
DAC2_
FORCE
R44
AIF_MUX8
2Ch
0
ADC_
FORCE
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
Table 40 Audio Interface Mux Force Bits



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