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RM0319 데이터시트(PDF) 293 Page - STMicroelectronics

부품명 RM0319
상세설명  SPEAr320S architecture and functionality
PDF  368 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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RM0319 데이터시트(HTML) 293 Page - STMicroelectronics

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RM0319
Digital audio port (I2S)
Doc ID 022640 Rev 3
293/368
27.4.3
Audio data interface
The default value of audio data for the TX/RX Channel is 32 bits. It can be reprogrammed
during operation to any supported audio data resolution that is less than 32 bits.
Valid values: 12, 16, 20, 24, or 32 bits.
Changes to the resolution are programmed my means of the word length (WLEN) bits of the
transmitter/receive configuration registers (TCR0[2:0]/RCR0[2:0]. The channel must be
disabled prior to any resolution changes.
27.4.4
External I2S_CLK gating and enable signal
When the audio data resolution of the receive and transmit channels is less than the current
word select size, the I2S_CLK can be gated off for the remainder of the left/right cycle. This
can be programmed during operation of the component by setting the I2S_CLK Gating
(SCLKG) bits [2:0] in the Clock Configuration Register (CCR).
The clock generation block must be disabled prior to any changes to I2S_CLK gating value.
27.5
Clocks
Figure 104. I2S clocks
PLL2
RAS_CLK_SYNT3
Clksel
(from configuration
registers)
DIV4
sclk
I2S
audio_over_samp_clk
I2S_CLK
I2S_LR
I2S_TX
I2S_RX



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