ST STM32L4x6 User Manual

DocID024597 Rev 3 1327/1693
RM0351 Serial audio interface (SAI)
1362
Figure 440. Slot size configuration with FBOFF = 0 in SAI_xSLOTR
It is possible to choose the position of the first data bit to transfer within the slots. This offset
is configured by FBOFF[4:0] bits in the SAI_xSLOTR register. 0 values will be injected in
transmitter mode from the beginning of the slot until this offset position is reached. In
reception, the bit in the offset phase is ignored. This feature targets the LSB justified
protocol (if the offset is equal to the slot size minus the data size).
Figure 441. First bit offset
It is mandatory to respect the following conditions to avoid bad SAI behavior:
FBOFF ≤ (SLOTSZ - DS),
DS ≤ SLOTSZ,
NBSLOT x SLOTSZ ≤ FRL (frame length),
The number of slots must be even when bit FSDEF in the SAI_xFRCR register is set.
In AC’97 and SPDIF protocol (bit PRTCFG[1:0] = 10 or PRTCFG[1:0] = 01), the slot size is
automatically set as defined in Section 39.3.9: AC’97 link controller.
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ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English