Cirrus Logic CS42L73 - Manual (Page 53)

DS882F1 53
CS42L73
The master mode supported rates for each supported MCLK are listed in the aforementioned table. The
table also documents how to program the X_MMCC[5:0], A_MMCC[5:0], and V_MMCC[5:0] registers to
derive the desired master mode Fs
ext
and how much the derived Fs
ext
rate deviates from the desired rate.
4.8.4.1 SCLK = MCLK Modes
The frequency of the Serial Clock (xSP_SCLK) is programmable in master mode using the register con-
trols X_SCLK = MCLK[1:0], A_SCLK=MCLK[1:0], and V_SCLK = MCLK[1:0]. It can be either automati-
cally derived to approximate 64 cycles per xSP_LRCK period, be equal to MCLK, or it can be set to be
equal to Pre-MCLK, the predivided version of MCLK (MCLK1 or MCLK2 as per register control MCLK-
SEL).
When in MCLK mode, all the MCLK1/MCLK2 rates and corresponding supported MCLK rates shown in
Table 1. “Internal Master Clock Generation” on page 42 are supported. When in Pre-MCLK mode, the
supported MCLK1/MCLK2 rates are as is shown in the following table.
4.8.5 Serial Port Sample Rates and Master Mode Settings
Table 5 illustrates the supported serial port nominal audio sample rates (Fs
ext
) and the settings required
to generate them when in master mode. See the notes on the following page.
Table 4. Supported MCLK1/MCLK2 Rates for Pre-MCLK Mode
MCLK1/MCLK2 = xSP_SCLK Rate (MHz)
5.6448
11.2896
6.0000
12.0000
6.1440
Table 5. Serial Port Rates and Master Mode Settings
MCLK Rate
(MHz) (Note 1)
Standard Audio
Sample Rate (kHz)
Actual Master Mode xSP_
LRCK Rate (Fs
ext
) (kHz)
Deviation (%) Settings for x_
MMCC[5:0] (Note 2)
5.6448
11.0250 11.0250 0.00 11 0000
22.0500 22.0500 0.00 10 0000
44.1000 44.1000 0.00 01 0000
8.0000 8.0000 0.00 11 1001
11.0250 11.0294 0.04 11 0011
12.0000 12.0000 0.00 11 0001
16.0000 16.0000 0.00 10 1001
6.0000 22.0500 22.0588 0.04 10 0011
24.0000 24.0000 0.00 10 0001
(Note 3) 32.0000 32.0000/31.9149 0.00/–0.27 01 1001
44.1000 44.1176 0.04 01 0011
48.0000 48.0000 0.00 01 0001
6.1440
8.0000 8.0000 0.00 11 1000
12.0000 12.0000 0.00 11 0000
16.0000 16.0000 0.00 10 1000
24.0000 24.0000 0.00 10 0000
32.0000 32.0000 0.00 01 1000
48.0000 48.0000 0.00 01 0000