STA311B datasheet(17/102 Pages) STMICROELECTRONICS

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STA311B

Serial audio interface

102

Serial audio interface

The STA311B audio serial input interfaces with standard digital audio components and

accepts a number of serial data formats. The STA311B always acts as a slave when

receiving audio input from standard digital audio components. Serial data for eight channels

is provided using 6 input pins: left/right clock LRCKI, serial clock BICKI, serial data 1 and 2

SDI_12, serial data 3 and 4 SDI_34, serial data 5 and 6 SDI_56, and serial data 7 and 8

SDI_78. The SAI/SAIFB register (configuration register B, address 0x01) is used to specify

the serial data format. The default serial data format is I²S, MSB-first.

4.1

Timings

In the STA311B, the BICKI and LRCKI pins are configured as inputs and they must be

supplied by the external peripheral.

Figure 3. Timing diagram for SAI interface

Table 8. 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

tDD

SDI propagation delay from BICKI active edge

tBCy

tDS

tLRH

tLRSU

tDD

LRCKI

BICKI

SDIxx

tBCH

tBCL

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