CS4201 Datasheet, PDF (41/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

CS4201
5.3 Serial Data Formats
In order to support a wide variety of serial audio
DACs, the CS4201 can transmit serial data in four
different formats. The desired format is selected
through the SDF[1:0] bits in the Serial Port Con-
trol Register (Index 6Ah). All serial ports use the
same serial data format when enabled. In all cases,
LRCLK will be synchronous with Fs, and SCLK
will be 64 Fs (BIT_CLK/4). Serial data is transi-
tioned by the CS4201 on the falling edge of SCLK
and latched by the DACs on the next rising edge.
Serial data is shifted out MSB first in all supported
formats, but LRCLK polarity as well as data justi-
fication, alignment, and resolution vary. Table 13
shows the principal characteristics of each serial
format.
SDF[1:0]
LRCLK
Polarity
Data
Justification
Data Alignment
(MSB vs. LRCLK)
Data
Resolution
Timing
Diagram
Recommended
DAC
0 0 negative left justified 1 SCLK delayed
01
positive left justified
not delayed
10
positive right justified
not delayed
11
positive right justified
not delayed
20-bit
20-bit
20-bit
16-bit
Figure 11
Figure 12
Figure 13
Figure 14
CS4334
CS4335
CS4337
CS4338
Table 13. Serial Data Formats and Compatible DACs for the CS4201
DS483PP3
41