UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1202 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
MCLK can be provided by a master or used by the master to create the I2S SCK. MCLK
can also be generated internally by the audio PLL through the CREG block (see
44.4.2 I2S connections to the GIMA
The Word Select (MWS) signal is generated by the I2S blocks in slave and master mode
to capture or generate data. MWS either originates either from the pin mux (SCU) in slave
mode (the I2S_WS signal) or is generated by the I2S block in master mode. The MWS
signal is then routed to the SCU (in master mode only) and to the GIMA where it can be
selected as input to Timer3 or the SCT. The MWS signal which is connected to the GIMA,
is divided by 128.
Fig 145. WS signal connections
ws gen
rx capture
/128
SCU (PINMUX)
ws_sel
GIMA
I2S
RX_MWS/TX_MWS
RX_WS/TX_WS
(slave mode)