Information

• Frame length from 1 to 16 words per frame
• Word length to support 8 to 32 bits per word
• First word length and remaining word lengths can be configured separately
• Can be configured for MSB first or LSB first
These configuration options cannot be changed after the SAI transmitter or receiver is
enabled.
Data FIFO
46.4.5.1 Data alignment
Each transmit and receive channel includes a FIFO of size 4 × 32-bit. The FIFO data is
accessed using the SAI Transmit/Receive Data Registers. Data in the FIFO can be
aligned anywhere within the 32-bit wide register through the use of the First Bit Shifted
configuration field, which selects the bit index (between 31 and 0) of the first bit shifted.
Examples of supported data alignment and the required First Bit Shifted configuration are
illustrated in Figure 46-51 for LSB First configurations and Figure 46-52 for MSB First
configurations.
Figure 46-51. SAI first bit shifted, LSB first
46.4.5
Chapter 46 Synchronous Audio Interface (SAI)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 1173