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CS42325 Fiches technique(PDF) 30 Page - Cirrus Logic

No de pièce CS42325
Description  10-In, 6-Out, 2 Vrms Audio CODEC with Headphone
Download  71 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS42325 Fiches technique(HTML) 30 Page - Cirrus Logic

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DS838A2
CS42325
4.2.1
Master Mode
As a clock master, the LRCKx and SCLKx of each serial port will operate as outputs. The two serial ports
may be independently placed into Master or Slave Mode. Each LRCKx and SCLKx are internally derived
from the MCLKx selected by the SP1_MCLK and SP2_MCLK signals as shown in Figure 10.
4.2.2
Slave Mode
In Slave Mode, SCLKx and LRCKx operate as inputs. Each serial port may be independently placed into
Slave Mode. The Left/Right clock signal, LRCKx, must be equal to the sample rate, Fs. The serial bit
clock, SCLKx, must be equal to 128x, 64x, 48x, or 32x Fs depending on the desired speed mode. Refer
to Table 6 for required serial bit clock to Left/Right clock ratios.
If operating in Asynchronous Mode, LRCK1 and SCLK1 must be synchronously derived from the SP1’s
selected MCLK, and LRCK2 and SCLK2 must be synchronously derived from SP2’s selected MCLK. If
operating in Synchronous Mode, SCLK1, LRCK1, SCLK2 and LRCK2 must be synchronously derived
from the same MCLK. For more information on Synchronous and Asynchronous Modes, see “Synchro-
nous / Asynchronous Mode” on page 29.
The speed of each serial port is automatically determined based on the input MCLKx to LRCKx ratio when
the Auto-Detect function is enabled. Certain input clock ratios will then require an internal divide-by-two
of MCLKx using either the MCLKx FREQ bits or the MDIV hardware control pin.
Serial Data Format
SCLKx to LRCKx Ratio
Single Speed Mode
Double Speed Mode
I²S, LJ or RJ Data Format
32, 48, 64, 128
32, 48, 64
Table 6. Slave Mode SCLK/LRCK Ratios
Mode
MCLKx to LRCKx Ratio
Single Speed Mode
Double Speed Mode
SW Auto Mode Detect
256, 384, 512, 768
128, 192, 256, 384
HW Auto Mode Detect
256, 512
128, 256
See Table 3 an Table 4 on page 28 for clock ratio configuration.
Table 7. MCLKx to LRCKx Ratios
÷256
÷128
÷4
÷2
0
1
Generated-LRCK1
Generated-SCLK1
00
01
10
÷1
÷1.5
÷2
11
÷3
MCLK1
÷256
÷128
÷4
÷2
Generated-LRCK2
Generated-SCLK2
0
1
SP2_SPEED
SP1_SPEED
SP2_MCLK
MCLK1 FREQ[1:0]
0
1
0
1
0
1
00
01
10
÷1
÷1.5
÷2
11
÷3
MCLK2
MCLK2 FREQ[1:0]
0
1
SP1_MCLK
Internal-MCLK1
Internal-MCLK2
Figure 10. Master Mode Clock Generation


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