STA680 datasheet(29/43 Pages) STMICROELECTRONICS

29 / 43 page

STA680

Digital I/O and memory interfaces

29/43

Figure 10.

Serial audio interface waveforms and timings

In Table 9 are reported the timing values for the output SAI interface.

5.3.2

Input serial audio interface

The input serial audio interface is used to receive the legacy AM/FM demodulated samples

from an external AM/FM Tuner for blending purpose.

The input SAI is an I2S interface which accepts 16 bit audio samples in stereo at a 44,100

S/s sample rate. Other sample rates may be supported by means of the internal ASRC. For

pin description refers to Table 8.

The input SAI supports a 32x or 64x bit clock. The 32x clock mode shifts out serial data with

no padding. The 64x clock mode shifts out the 16-bit audio data first followed by 16 bits of

zero padding. Figure 10 shows timing diagrams for the supported modes.

5.3.3

S/PDIF interface

The S/PDIF Interface is an output only. It is compliant to the standard IEC 958 type II. For

pin description refers to Table 8.

D15 D14 D13 D12 D11 D10 D9 D8

D0 D15 D14 D13 D12 D11 D10 D9

LEFT

RIGHT

AWS

ABCK

ADAT

32X Mode (16 - bit data)

D15 D14 D13

…

0D15 D14 D13

LEFT

RIGHT

AWS

ABCK

ADAT

64X Mode (32 - bit data)

…

1/Faws

1/Fabck,16

1/Fabck,32

AC00717

Table 9.

Serial audio interface timing values

Symbol

Parameter

Condition

Working rate

Unit

Faws

Word strobe

44.1 ±10 Hz 45.6 ±15 Hz

48 ±15 Hz

kHz

Fabck,16

Bit clock for 16-bit data

32 x Faws

MHz

Fabck,32

Bit clock for 32-bit data

64 x Faws

MHz

Data hold time

Data setup time

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