Cirrus Logic CS42L56 - Manual (Page 60)

60 DS851F2
CS42L56
6.5.5 MCLK Divide
Configures a divide of the MCLK after the MCLK pre-divide.
6.5.6 MCLK Disable
Configures the MCLK signal prior to all internal circuitry.
Note: This function should be enabled during power down (PDN=1) ONLY.
6.6 Clocking Control 2 (Address 06h)
6.6.1 Clock Ratio Auto-Detect
Configures the power status of the Auto-Detect circuitry. When enabled, the Auto-Detect circuitry detects
when the LRCK changes and automatically adjusts internal clock divide-ratios eliminating the need of a
register write to account for the change. It should be noted that the Auto-detect circuitry can only detect
when the LRCK changes by a factor of two while the MCLK stays the same (for instance, Mclk = 6.000
MHz; LRCK changes from 48 kHz to 24 kHz). Any other major clock frequency changes must be account-
ed for by appropriate control port writes.
Note: When AUTO is enabled, the MCLK/LRCK ratio must be implemented according to Table 3 on
page 47 .
MCLKDIV2 MCLK signal into CODEC
0 No divide
1 Divided by 2
Application: “Serial Port Clocking” on page 47
MCLKDIS MCLK signal into CODEC
0 On
1 Off; Disables the clock tree to save power when the CODEC is powered down.
7 6 5 4 3 2 1 0
Reserved Reserved AUTO RATIO4 RATIO3 RATIO2 RATIO1 RATIO0
AUTO Auto-detection of Clock Ratio
0 Disabled
1 Enabled
Application:
“Serial Port Clocking” on page 47