CS4231A Datasheet, PDF (33/76 Pages) List of Unclassifed Manufacturers – PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC

CS4231A
Fs and Playback Data Format (I8)
D7 D6 D5 D4 D3 D2 D1 D0
FMT1 FMT0 C/L S/M CSF2 CFS1 CFS0 C2SL
C2SL
Clock 2 Source Select: This bit selects
the clock source used for the audio
sample rates for both capture and
playback. If only one crystal is sup-
plied in hardware, it must be XTAL1.
CAUTION: C2SL can only be
changed while MCE (R0) is set.
0 - XTAL1
1 - XTAL2
Typically 24.576 MHz
Typically 16.9344 MHz
CFS2-CFS0
Clock Frequency Divide Select: These
bits select the audio sample fre-
quency for both capture and
playback. The actual audio sample
frequency depends on which clock
source (C2SL) is selected and its fre-
quency. Frequencies listed as N/A
are not available because their sam-
ple frequency violates the maximum
specifications; however, the decodes
are available and may be used with
crystals that do not violate the sam-
ple frequency specifications.
CAUTION: CFS2-CFS0 can only be
changed while MCE (R0) is set.
Divide
0 - 3072
1 - 1536
2 - 896
3 - 768
4 - 448
5 - 384
6 - 512
7 - 2560
XTAL1
24.576 MHz
8.0 kHz
16.0 kHz
27.42 kHz
32.0 kHz
N/A
N/A
48.0 kHz
9.6 kHz
XTAL2
16.9344 MHz
5.51 kHz
11.025 kHz
18.9 kHz
22.05 kHz
37.8 kHz
44.1 kHz
33.075 kHz
6.62 kHz
S/M
Stereo/Mono Select: This bit deter-
mines how the audio data streams
are formatted. Selecting stereo will
result in alternating samples repre-
senting left and right audio channels.
Mono playback plays the same
audio sample on both channels.
Mono capture only captures data
from the left channel. In MODE 1,
this bit is used for both playback and
capture. In MODE 2, this bit is only
used for playback, and the capture
format is independently selected via
I28. MCE (R0) or PMCE (I16) must
be set to modify S/M. See Changing
Audio Data Formats section for
more details.
0 - Mono
1 - Stereo
The C/L, FMT1, and FMT0 bits set the audio data
format as shown below. In MODE 1, FMT1, which is
forced low, FMT0, and C/L are used for both play-
back and capture. In MODE 2, these bits are only
used for playback, and the capture format is inde-
pendently selected via register I28. MCE (R0) or
PMCE (I16) must be set to modify the lower four bits
of this register. See Changing Audio Data Formats
section for more details.
FMT1^† FMT0 C/L
D7 D6 D5
0
00
0
01
0
10
0
11
1
00
1
01
1
10
1
11
Linear, 8-bit unsigned
µ-Law, 8-bit companded
Linear, 16-bit two’s
complement, Little Endian
A-Law, 8-bit companded
RESERVED
ADPCM, 4-bit, IMA compatible
Linear, 16-bit two’s
complement, Big Endian
RESERVED
† FMT1 is not available in MODE 1 (forced to 0).
This register’s initial state after reset is: 0000000.
DS139PP2
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