CX20921 AudioSmart Data Sheet

Sony/Philips Digital Interface Format (S/PDIF) Receiver

Conexant Confidential

03/11/15

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Sony/Philips Digital Interface Format (S/PDIF) Receiver

The CX20921 supports the industry-standard IEC 60958 digital audio interface, also known as S/PDIF.

The S/PDIF receiver is a serial, uni-directional, self-clocking interface for the interconnection of digital

audio equipment. The S/PDIF provides a digital audio interface for receiving and playback of audio. The

audio data is coded in PCM format with a resolution of 16-bits or 24-bits per sample.

The S/PDIF receiver supports sample rates from 44.1kHz up to 192kHz.

Note:

The SPDIF_IN signal is multiplexed with I2S_RX_DATA_3.

Integrated Interchip Sound (I2S)

The CX20921 supports independent three-wire TX and five-wire RX interfaces. Each interface can be set

for master or slave mode. The:

•

TX and RX interfaces can be powered independently.

•

TX three-wire mode consists of signals BCLK, LRCLK, and TX_DATA.

•

RX five-wire mode consists of signals BCLK, LRCLK, and RX_DATA_1, RX_DATA_2, RX_DATA_3

Note:

The I2S_RX_DATA_3 is multiplexed with SPDIF_IN.

Both interfaces support audio sample rates from 8kHz up to 192kHz for both record and playback. The

supported sample widths are 8-bit, 16-bit, and 24-bit.

The CX20921 supports standard I2S mode, left-justified mode, and right-justified mode.

Note:

–

I2S_TX_LRCLK_2 is multiplexed with DMIC_CLK and RTS.

–

I2S_TX_DATA_2 is multiplexed with DMIC_DATA, SPI select 1 (SSI_SS1), and CTS.

–

I2S_TX_CLK_2 is multiplexed with GPIO2.