CS4272-CZZR Cirrus Logic Inc, CS4272-CZZR Datasheet - Page 28

• Manufacturer Part Number: CS4272-CZZR
• Description: IC,Soundcard Circuits,TSSOP,28PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

To operate the CS4272 with an externally generated MCLK signal, no crystal should be used, XTI should be con-
nected to ground and XTO should be left unconnected. In this configuration, MCLK is an input and must be driven
externally with an appropriate speed clock.
5.2.3.2
Depending on the use of an external crystal, or whether the CS4272 is in Master or Slave Mode, different
MCKL/LRCK and SCLK/LRCK ratios may be used. These ratios as well as the Control Port Register Bits that must
be set in order to obtain them are shown in Tables 8 and 9 below.
Notes: 27. For the Ratio1 and Ratio0 bits listed above, “d” indicates that any value may written.
28
Double Speed
Double Speed
Single Speed
Single Speed
Quad Speed
Quad Speed
Clock Ratio Selection
Table 8. Clock Ratios - Control Port Mode With External Crystal
MCLK/LRCK
MCLK/LRCK
256
512
128
256
128
256
512
128
256
128
Double Speed
External Crystal Used, MCLK=Output
Single Speed
Quad Speed
Mode
Table 7. Crystal Frequencies
SCLK/LRCK
SCLK/LRCK
32, 64, 128
32, 64, 128
32, 64
32, 64
32, 64
Master Mode
Slave Mode
64
64
64
64
64
Crystal Frequency
512 x Fs
256 x Fs
128 x Fs
LRCK
LRCK
Fs
Fs
Fs
Fs
Fs
Fs
Fs
Fs
Fs
Fs
Ratio1 Bit
Ratio1 Bit
d
d
0
1
0
1
0
1
0
1
27
27
Ratio0 Bit
Ratio0 Bit
CS4272
d
d
d
d
d
d
d
d
d
d
DS593F1
27
27
27
27
27
27
27
27
27
27