Serial audio interface (SAI) RM0390
938/1328 RM0390 Rev 4
Figure 356. FS role is start of frame + channel side identification (FSDEF = TRIS = 1)
1. The frame length should be even.
If FSDEF bit in SAI_xFRCR is kept clear, so FS signal is equivalent to a start of frame, and if
the number of slots defined in NBSLOT[3:0] in SAI_xSLOTR multiplied by the number of bits
by slot configured in SLOTSZ[1:0] in SAI_xSLOTR is less than the frame size (bit FRL[7:0]
in the SAI_xFRCR register), then:
• if TRIS = 0 in the SAI_xCR2 register, the remaining bit after the last slot will be forced to
0 until the end of frame in case of transmitter,
• if TRIS = 1, the line will be released to HI-Z during the transfer of these remaining bits.
In reception mode, these bits are discarded.
VFN
VORW
$XGLRIUDPH
)6
+DOIRIIUDPH
$XGLRIUDPH
)6
+DOIRIIUDPH
1XPEHURIVORWVQRWDOLJQHGZLWKWKHDXGLRIUDPH
1XPEHURIVORWVDOLJQHGZLWKWKHDXGLRIUDPH
069
6ORW
VFN
VORW
6ORW 6ORW
6ORW 6ORW6ORW
6ORW21 6ORW2))
6ORW21
6ORW21 6ORW2)) 6ORW21
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