STA310 datasheet(28/90 Pages) STMICROELECTRONICS

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STA310

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How to read the above table:

The first 4 columns list the possible configurations for output formats on the PCM outputs. The 5th column gives

the description of the internal 24-bit decoded, scaled and rounded audio samples as they are stored in memory.

These 24 bits are referred to as d23, d22,..., d0, where MSB=d23, LSB=d0. The last column describes the se-

quence of bits that are output on PCM_OUT according to the selected format.

Example 1: in 16-bit mode, with PCMCONF.ORD=1: In memory, 24 bits are stored, where only the 16 MSB bits

(d23, d22,... to d8) are significant and the 8 remaining bits are 0. This is noted: {d23-d8} {8*0}. The data are sent

LSB first, i.e. d8 is sent first and d23 is sent last. This is noted {d8-d23}. 16 bits only are transmitted per channel.

Example 2: in 20-bit mode (PCMCONF.ORD field is meaningless in this mode), with PCMCONF.FOR=1 and

PCMCONF.DIF=0: In memory, 24 bits are stored, where only the 20 MSB (d23 to d4) are significant and the

remaining 4 LSB are 0.This is noted: {d23-d4} {4*0}. 32 bits are transmitted per channel on the PCM outputs:

the 12 first transmitted bits are d23, the last bits are d23 to d4, where d23 is transmitted first. This is noted:

{12*d23} {d23-d4}.

5.4.2 Clocks polarity selection

The polarity of the PCM serial output clock, SCLK and the polarity of the PCM word clock LRCLK are selected

by the field SCL and INV respectively, in the PCMCONF register.

5.4.3 I2S format compatible outputs

To output I²S compatible data, the PCMCONF register must be configured as follows

5.4.4 Sony format compatible outputs

Figure 16. SCLK Polarity

Figure 17. LRCLK Polarit

PCMCONF.DIF

= 1

not right padded,

PCMCONF.FOR

= 0

I²S format,

PCMCONF.INV

= 0

do not invert LRCLK,

PCMCONF.SCL

= 0

do not invert SCLK.

PCMCONF.FOR

= 1

Sony format,

PCMCONF.INV

= 1

Invert LRCLK.

SCLK

LRCLK

PCM_OUT0, 1, 2

SCL = 0

SCLK

LRCLK

PCM_OUT0, 1, 2

SCL = 1

LRCLK

Left

Right

Left

Right

INV = 1

INV = 0

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