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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1056 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.2.5
4-Wire Receiver mode
Table 923.
4-Wire Receiver mode
CREG bit 13 DAI bit 5
RXMODE
bits [3:0]
Description
x
0
0 0 x x
4-wire receiver mode sharing the transmitter TX_SCK and TX_WS (4-pin mode).
The I2S receive function operates as an internal slave to the transmit function.
The transmit function can operate in either master or slave mode, determining
the operating mode of the entire I2S interface.
The receive clock source is TX_SCK.
The WS used is the internally generated TX_WS.
The RX_MCLK pin is not enabled for output.
Bold lines indicate the clock path for this configuration.
Fig 146.
4-Wire Receiver mode
I
2
S
peripheral
block
1
0
I2SRXMODE[2]=1
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
RX_MCLK
8-bit
Fractional
Rate Divider
X
Y
I2SDAI[5]=1
I2STX_RATE[15:8]
I2STX_RATE[7:0]
01
10
I2SRXMODE[1:0]=XX
I2SRXBITRATE[5:0]
1
0
TX_WS
RX_WS
I2S_RX_WS
I2SDAI[5]=1
Pin OEn
I2S_RX_SDA
I2S_RX_MCLK
I2SRXMODE[3]=0
I2S_RX_SCK
Pin OE
0
1
00
0
1
CREG6[13]=X
0
1
PLLAUDIO
PCLK
I2SRXMODE[2]=0