2 clock ratio selection, Outlined in the tables 3 and 4, Cs4271 – Cirrus Logic CS4271 User Manual
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CS4271
DS592F1
25
5.1.3.2
Clock Ratio Selection
Depending on the use of an external crystal, or whether the CS4271 is in Master or Slave Mode, different
MCKL/LRCK and SCLK/LRCK ratios may be used. These ratios are shown in the Tables 3 and 4 below.
Table 3. Clock Ratios - Stand Alone Mode With External Crystal
External Crystal Used, MCLK=Output
Master Mode
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
64
Fs
Double Speed
128
64
Fs
Quad Speed
128
64
Fs
Slave Mode
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
32, 64, 128
Fs
Double Speed
128
32, 64
Fs
Quad Speed
128
32, 64
Fs
Table 4. Clock Ratios - Stand Alone Mode Without External Crystal
External Crystal Not Used, MCLK=Input
Master Mode
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
64
Fs
Double Speed
128
64
Fs
Quad Speed
64
32
Fs
Slave Mode
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
32, 64, 128
Fs
384
32, 48, 64, 96, 128
Fs
512
32, 64, 128
Fs
Double Speed
128
32, 64
Fs
192
32, 48, 64
Fs
256
32, 64
Fs
Quad Speed
64
32
Fs
96
48
Fs
128
32, 64
Fs