DocID13902 Rev 15 714/1128
RM0008 Serial peripheral interface (SPI)
742
25.4 I
2
S functional description
The I
2
S audio protocol is not available in low- and medium-density devices. This section
concerns only high-density, XL-density and connectivity line devices.
25.4.1 I
2
S general description
The block diagram of the I
2
S is shown in Figure 248.
Figure 248. I
2
S block diagram
4XBUFFER
3HIFTREGISTER
BIT
#OMMUNICATION
2XBUFFER
BIT
-/3) 3$
-ASTERCONTROLLOGIC
-)3/
30)
BAUDRATEGENERATOR
#+
)3-/$
,3"FIRST
,3"
&IRST
30% "2 "2 "2
-342 #0/, #0(!
"IDI
MODE
"IDI
/%
#2#
%.
#2#
.EXT
$&&
2X
ONLY
33-
33)
!DDRESSANDDATABUS
CONTROL
.3373
"39 /62 -/$&
#2#
%22
#(
3)$%
4X% 2X.%
)
3CLOCKGENERATOR
-#+
)3?#+
)3
-/$
)3%
#(
$!4,%.
,%.
#+
0/,
)3#&' )334$
-#+/%/$$ )3$)6;=
;= ;=
;=
5$2
)3X#,+
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