18

DS691A3

CS4350

4.3

Digital Interface Format

The device will accept audio samples in 1 of 8 digital interface formats, as shown in Table 3 on page 23 for

Stand-Alone Mode and Table 4 on page 28 for Control Port Mode.

The desired serial audio interface format is selected via the DIF[2:0] bits in Control Port Mode (see

Section 8.2.1), or the DIF[2:0] pins in Stand-Alone Mode (see Section 5.1). For illustrations of the required

relationship between LRCK, SCLK and SDIN, see Figures 8-10. For all formats, SDIN is valid on the rising

edge of SCLK.

For more information about serial audio formats, refer to the Cirrus Logic Application Note AN282,

The 2-Channel Serial Audio Interface: A Tutorial

+3

+2

+1

+5

+4

MSB

-1

-2

-3

-4

-5

+3

+2

+1

+5

+4

-1

-2

-3

-4

LSB

MSB

LSB

Left Channel

Right Channel

LRCK

SCLK

SDIN

Figure 8. Left-Justified up to 24-Bit Data

+3

+2

+1

+5

+4

MSB

-1

-2

-3

-4

-5

+3

+2

+1

+5

+4

-1

-2

-3

-4

MSB

LSB

LSB

Left Channel

Right Channel

LRCK

SCLK

SDIN

Figure 9. I²S, up to 24-Bit Data

SDIN

+6

+5

+4

+3

+2

+1

+7

-1

-2

-3

-4

-5

LSB

LSB

MSB

-1

-2

-3

-4

-5

LSB

+6

+5

+4

+3

+2

+1

+7

MSB

Left Channel

Right Channel

LRCK

SCLK

Figure 10. Right-Justified Data