Figure 6.17-7 I 2 S Data Format Timing Diagram (Format = 0X0 ; Chwidth≦Datwidth); Figure 6.17-8 Msb Justified Data Format (Format = 0X1 ; Chwidth > Datwidth); Figure 6.17-9 Lsb Justified Data Format (Format = 0X2 ; Chwidth > Datwidth) - Nuvoton ISD94124BYI Technical Reference Manual

Isd arm cortex-m4f soc

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I2S_BCLK cycle of an audio channel. The MSB justified and LSB justified data format of I

can be selected by FORMAT (I2S_CTL0[26:24]).

Figure 6.17-7 I

S Data Format Timing Diagram (FORMAT = 0x0 ; CHWIDTH≦DATWIDTH)

Figure 6.17-8 MSB Justified Data Format (FORMAT = 0x1 ; CHWIDTH > DATWIDTH)

Figure 6.17-9 LSB Justified Data Format (FORMAT = 0x2 ; CHWIDTH > DATWIDTH)

S controller also supports PCM audio transmission which can be selected by FORMAT

(I2S_CTL0[26:24]). In PCM protocol, the function of I2S_LRCLK is simply to identify the beginning

of an audio sample (or audio frame) and it is always indicated by the rising edge of the pulse.

Therefore, the I2S_LRCLK in PCM protocol may be also called "frame start" or "frame sync" signal.

In master device, there are two common representations for the width of the frame start pulse which

can use PCMSYNC (I2S_CTL0[27]) to choose: One is equivalent to the period of a channel width

and the other is equivalent to a single period of the I2S_BCLK.

S protocol, the DATWIDTH (I2S_CTL0[5:4]) and CHWIDTH (I2S_CTL0[29:28]) can be

used to configure the data bit-width and channel bit-width in PCM protocol. Besides, FORMAT

(I2S_CTL0[26:24]) can also be used to select the different data formats of PCM standard mode,

ISD94100 Series Technical Reference Manual

Left channel of frame N

Left channel of frame N

Left channel of frame N

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Right channel of frame N

Right channel of frame N

Right channel of frame N

Left channel

of frame N+1

Left channel

of frame N+1

Left channel

of frame N+1

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