CS42528 Datasheet, PDF (54/91 Pages) Cirrus Logic – 114 dB, 192 kHz 8-Ch Codec with S/PDIF Receiver

CS42528
6.7.2
OMCK FREQUENCY (OMCK FREQX)
Default = 00
Function:
Sets the appropriate frequency for the supplied OMCK.
OMCK Freq1 OMCK Freq0 Description
0
0
11.2896 MHz or 12.2880 MHz
0
1
16.9344 MHz or 18.4320 MHz
1
0
22.5792 MHz or 24.5760 MHz
1
1
Reserved
Table 11. OMCK Frequency Settings
6.7.3 PLL LOCK TO LRCK (PLL_LRCK)
Default = 0
0 - Disabled
1 - Enabled
Function:
When enabled, the internal PLL of the CS42528 will lock to the SAI_LRCK of the SAI serial port.
6.7.4
MASTER CLOCK SOURCE SELECT (SW_CTRLX)
Default = 00
Function:
These two bits, along with the UNLOCK bit in register “Interrupt Status (address 20h) (Read Only)”
on page 64, determine the master clock source for the CS42528. When SW_CTRL1 and SW_CTRL0
are set to '00'b, selecting the output of the PLL as the internal clock source, and the PLL becomes
unlocked, then RMCK will equal OMCK, but all internal and serial port timings are not valid.
When the FRC_PLL_LK bit is set to ‘1’b, the SW_CTRLX bits must be set to ‘00’b. If the PLL becomes
unlocked when the FRC_PLL_LK bit is set to ‘1’b, then RMCK will not equal OMCK.
SW_CTRL1 SW_CTRL0
0
0
0
1
1
0
1
1
UNLOCK
X
X
0
1
0
1
Description
Manual setting, MCLK sourced from PLL.
Manual setting, MCLK sourced from OMCK.
Hold, keep same MCLK source.
Auto switch, MCLK sourced from OMCK.
Auto switch, MCLK sourced from PLL.
Auto switch, MCLK sourced from OMCK.
Table 12. Master Clock Source Select
6.7.5
FORCE PLL LOCK (FRC_PLL_LK)
Default = 0
Function:
This bit is used to enable the PLL to lock to the S/PDIF input stream or the SAI_LRCK with the ab-
sence of a clock signal on OMCK.When set to a ‘1’b, the auto-detect sample frequency feature will
be disabled and the SW_CTRLX bits must be set to ‘00’b. The OMCK/PLL_CLK Ratio (address 07h)
(Read Only) register contents are not valid and the PLL_CLK[2:0] bits will be set to ‘111’b. Use the
DE-EMPH[1:0] bits to properly apply de-emphasis filtering.
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