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40.5.3 Synchronous modes
The SAI transmitter and receiver can operate synchronously to each other.
40.5.3.1 Synchronous mode
The SAI transmitter and receiver can be configured to operate with synchronous bit clock
and frame sync.
If the transmitter bit clock and frame sync are to be used by both the transmitter and
receiver:
• The transmitter must be configured for asynchronous operation and the receiver for
synchronous operation.
• In synchronous mode, the receiver is enabled only when both the transmitter and
receiver are enabled.
• It is recommended that the transmitter is the last enabled and the first disabled.
If the receiver bit clock and frame sync are to be used by both the transmitter and
receiver:
• The receiver must be configured for asynchronous operation and the transmitter for
synchronous operation.
• In synchronous mode, the transmitter is enabled only when both the receiver and
transmitter are both enabled.
• It is recommended that the receiver is the last enabled and the first disabled.
When operating in synchronous mode, only the bit clock, frame sync, and transmitter/
receiver enable are shared. The transmitter and receiver otherwise operate independently,
although configuration registers must be configured consistently across both the
transmitter and receiver.
40.5.4 Frame sync configuration
When enabled, the SAI continuously transmits and/or receives frames of data. Each
frame consists of a fixed number of words and each word consists of a fixed number of
bits. Within each frame, any given word can be masked causing the receiver to ignore
that word and the transmitter to tri-state for the duration of that word.
Freescale Semiconductor, Inc.
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Chapter 40 Synchronous Audio Interface (SAI)
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