STA350B datasheet(28/94 Pages) STMICROELECTRONICS

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Serial audio interface

STA350B, STA350BW

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DocID018572 Rev 7

Serial audio interface

The STA350Bx audio serial input interface has been designed to interface with standard

digital audio components and to accept a number of serial data formats. The STA350Bx

always acts as the slave when receiving audio input from standard digital audio

components. Serial data for two channels is provided using three inputs: left/right clock

LRCKI, serial clock BICKI, and serial data SDI12.

The SAI bit and the SAIFB bit are used to specify the serial data format. The default serial

data format is I2S, MSB-first.

5.0.1

Timings

In the STA350Bx the BICKI and LRCKI pins are configured as inputs and they must be

supplied by the external peripheral.

Figure 18. Timing diagram for SAI interface

5.0.2

Delay serial clock enable

To tolerate anomalies in some I2S master devices, a PLL clock cycle delay can be added to

the BICKI signal before the SAI interface.

5.0.3

Channel input mapping

Each channel received via I2S can be mapped to any internal processing channel via the

channel input mapping registers. This allows for flexibility in processing. The default settings

of these registers map each I2S input channel to its corresponding processing channel.

Table 7. Timing parameters for slave mode

Symbol

Parameter

Min.

Typ.

Max.

Unit

tBCy

BICK cycle time

tBCH

BICK pulse width high

tBCL

BICK pulse width low

tLRSU

LRCKI setup time to BICKI strobing edge

tLRH

LRCKI hold time to BICKI strobing edge

tLRJT

LRCKI jitter tolerance

tBCy

tLRH

tLRSU

LRCKI

BICKI

SDI12

tBCH

tBCL

80%

40%

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