CS47L35 datasheet(110/300 Pages) CIRRUS

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110

DS1085F3

CS47L35

4.6 Digital Audio Interface

DSP Mode A data format is shown in Fig. 4-37.

Figure 4-37. DSP Mode A Data Format

DSP Mode B data format is shown in Fig. 4-38.

Figure 4-38. DSP Mode B Data Format

•In I2S Mode, the MSB is available on the second rising edge of BCLK following a LRCLK transition. The other bits

up to the LSB are then transmitted in order. Depending on word length, BCLK frequency, and sample rate, there

may be unused BCLK cycles between the LSB of one sample and the MSB of the next.

I2S Mode data format is shown in Fig. 4-39.

Figure 4-39. I2S Data Format (Assuming n-Bit Word Length)

• In Left-Justified Mode, the MSB is available on the first rising edge of BCLK following a LRCLK transition. The other

bits up to the LSB are then transmitted in order. Depending on word length, BCLK frequency, and sample rate, there

may be unused BCLK cycles before each LRCLK transition.

Left-Justified Mode data format is shown in Fig. 4-40.

Figure 4-40. Left-Justified Data Format (Assuming n-Bit Word Length)

n-1

n-2

n-1

n-2

LEFT CHANNEL

RIGHT CHANNEL

MSB

LSB

Input Word Length (WL)

1/Fs

LRCLK

BCLK

RXDAT/

TXDAT

1 BCLK

In Slave Mode, the falling edge can occur anywhere in this area

1 BCLK

n-1

n-2

n-1

n-2

LEFT CHANNEL

RIGHT CHANNEL

MSB

LSB

Input Word Length (WL)

1/Fs

LRCLK

BCLK

RXDAT/

TXDAT

1 BCLK

In Slave Mode, the falling edge can occur anywhere in this area

n-1

n-2

n-1

n-2

LEFT CHANNEL

RIGHT CHANNEL

MSB

LSB

Input Word Length (WL)

1/Fs

LRCLK

BCLK

RXDAT/

TXDAT

1 BCLK

n-1

n-2

n-1

n-2

LEFT CHANNEL

RIGHT CHANNEL

MSB

LSB

Input Word Length (WL)

1/Fs

LRCLK

BCLK

RXDAT/

TXDAT

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