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22.9.2 Termination Sequence

This termination sequence consists of six steps that ensure the I2S module completes all buffers before

closing down I/O pins. If this is not important and the system allows read and write access to NULL, step

1, 2, and step 5 may be ignored.

1. Do not update (or write NULL to) the [I2S:AIFINPTRNEXT] or [I2S:AIFOUTPTRNEXT] registers at

memory interface in/out interrupt.

2. Await next memory interface in/out interrupt:

• The I2S module closes down input/output pins after this interrupt because NULL is loaded as

pointer.

• The [I2S:IRQ_FLAGS:PTR_ERR] register is set because NULL is loaded as pointer, and the I2S

module error interrupt is generated.

3. Set [I2S:AIFDMACFG] = 0.

4. Set [I2S:STMPCTL:STMP_EN] = 0.

5. Clear the [I2S:IRQ_FLAGS:PTR_ERR] register.

6. Disable the BCLK source (done externally in the PRCM module).

22.10 I2S Registers

1422

Integrated Interchip Sound (I2S) Module SWCU117A–February 2015–Revised March 2015

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