CS4202 datasheet(43/68 Pages) CIRRUS

No de pièce	CS4202

Description	Audio Codec 97 with headphone Amplifier

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Fabricant	CIRRUS [Cirrus Logic]

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CS4202

DS549PP1

43

5.3

Serial Data Formats

In order to support a wide variety of serial audio

DACs, the CS4202 can transmit serial data in four

different formats. The desired format is selected

through the SDF[1:0] bits in the Serial Port Control

Register (Index 6Ah). All serial ports use the same

serial data format when enabled. In all cases, LR-

CLK will be synchronous with Fs, and SCLK will

be 64 Fs (BIT_CLK/4). Serial data is transitioned by

the CS4202 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 justification, align-

ment, and resolution vary. Table 14 shows the prin-

cipal 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

20-bit

Figure 11

CS4334

0 1

positive

left justified

not delayed

20-bit

Figure 12

CS4335

1 0

positive

right justified

not delayed

20-bit

Figure 13

CS4337

1 1

positive

right justified

not delayed

16-bit

Figure 14

CS4338

Table 14. Serial Data Formats and Compatible DACs for the CS4202

LR C K

SC L K

Left C ha n ne l

R ight C han ne l

SD AT A

+3 +2 +1 LSB

+5 +4

MSB -1 -2-3-4-5

+3 +2 +1 LSB

+5 +4

MSB -1-2-3-4

Figure 11. Serial Data Format 0 (I

2S)

LR C K

SC L K

Left C ha n ne l

R ight C han ne l

SD AT A

+3 +2 +1 LSB

+5 +4

MSB-1 -2-3-4-5

+3 +2 +1 LSB

+5 +4

MSB -1-2-3-4

Figure 12. Serial Data Format 1 (Left Justified)

L RCK

SC L K

Le ft C h ann el

R ight C ha nne l

SD A T A

654321

0

987

15 14 13 12 11 10

10

6543

210

98

7

15 14 13 12 11 10

17 16

19 18

Figure 13. Serial Data Format 2 (Right Justified, 20-bit data)

L RCK

SC L K

Left C ha nnel

R ight C hannel

SD A T A

65

43

21

0

98

7

15 14 13 12 11 10

6

5

432

10

98

7

15 14 13 12 11 10

Figure 14. Serial Data Format 3 (Right Justified, 16-bit data)

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