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Figure 13. format 5 - right-justified 18-bit data, 1 olm #1, Figure 14. format 8 - one line mode 1 – Cirrus Logic CS4364 User Manual

Page 23: 2 olm #2, Figure 15. format 9 - one line mode 2, 4 oversampling modes, 1 olm #1 4.3.2 olm #2, Cs4364

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DS619F1

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CS4364

4.3.1

OLM #1

OLM #1 serial audio interface format operates in Single-, Double-, or Quad-Speed Mode and will slave to
SCLK at 128 Fs. Six channels of MSB first 20-bit PCM data are input on SDIN1.

4.3.2

OLM #2

OLM #2 serial audio interface format operates in Single-, Double-, or Quad-Speed Mode and will slave to
SCLK at 256 Fs. Six channels of MSB first 24-bit PCM data are input on SDIN1.

4.4

Oversampling Modes

The CS4364 operates in one of three oversampling modes based on the input sample rate. Mode selection
is determined by the M4, M3 and M2 pins in Hardware Mode or the FM bits in Software Mode. Single-Speed
Mode supports input sample rates up to 50 kHz and uses a 128x oversampling ratio. Double-Speed Mode
supports input sample rates up to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed Mode sup-
ports input sample rates up to 200 kHz and uses an oversampling ratio of 32x.

The auto speed-mode detect feature allows for the automatic selection of speed mode based off of the in-
coming sample rate. This allows the CS4364 to accept a wide range of sample rates with no external inter-
vention necessary. The auto speed-mode detect feature is available in both Hardware and Software Mode.

LRCK

SCLK

Left Channel

Right Channel

SDINx

6

5

4

3

2

1

0

9

8

7

15 14 13 12 11 10

1

0

6

5

4

3

2

1

0

9

8

7

15 14 13 12 11 10

17 16

17 16

32 clocks

Figure 13. Format 5 - Right-Justified 18-bit Data

LRCK

SCLK

LSB

MSB

20 clks

64 clks

64 clks

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

MSB

DAC_A1

20 clks

20 clks

20 clks

20 clks

20 clks

Left Channel

Right Channel

SDIN1

DAC_A2

DAC_A3

DAC_B1

DAC_B2

DAC_B3

Figure 14. Format 8 - One Line Mode 1

LSB

MSB

24 clks

128 clks

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

MSB

DAC_A1

24 clks

24 clks

24 clks

24 clks

24 clks

Left Channel

Right Channel

128 clks

LRCK

SCLK

SDIN1

DAC_A2

DAC_A3

DAC_B1

DAC_B2

DAC_B3

Figure 15. Format 9 - One Line Mode 2