Revisions Affected:

Revision E and earlier

Details:

The I²S module will not set the bus error interrupt flag (I2S0.IRQFLAGS.BUS_ERR) if an I²S read or write causes a system bus fault that results from access to illegal addresses (usage error).

Workaround:

Software must ensure that memory area used by the I²S DMA is accessible, meaning that the memory is powered on and the system bus is connected..

As an example; The TI-provided SPI driver SPICC26X2DMA.c will ensure that the flash memory is kept accessible also in Idle power mode if the transmit buffer address starts with 0x0 to ensure no bus faults occur. A similar approach needs to be taken if writing a peripheral driver utilizing I2S.