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CS4298 데이터시트(PDF) 16 Page - Cirrus Logic

부품명 CS4298
상세설명  SoundFusion Audio/Modem Codec 97 (AMC 97)
PDF  52 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS4298 데이터시트(HTML) 16 Page - Cirrus Logic

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CS4298
16
DS315PP2
5. AC ‘97
5.1
AC ‘97 Frame Definition
The AC Link is a bi-directional serial port with thirteen time-division multiplexed slots in each di-
rection. The first slot is 16 bits long and termed the tag slot. Bits in the tag slot determine if the Codec
is ready and indicate which, if any, other slots contain valid data. Slots 1 through 11 are 20-bits long
and can contain audio data. Slot 12 contains data to be written and read from GPIO. The serial data
line is defined from the Controller’s perspective, NOT from the Audio Codec’s perspective.
5.2
AC-Link Serial Data Output Frame
In the serial data output frame, data is passed on the SDATA_OUT pin TO the CS4298 FROM the
Controller. Figure 9 illustrates the serial port timing.
20.8
µS
(48 kHz)
Tag Phase
Data Phase
12.288 MHz
81.4 nS
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
F0
F1
F2
F16
F15
F14
F13
F12
F35
F56
F76
0
F255
Valid
Frame
Slot 1
Valid
00
SCRA1 SCRA0
R/W
0
WD15
F36
F57
LP19
LP18
RP19
LC17
LC16
RC17
RD15
0
0
0
0
0
Bit Frame Position:
F0
F1
F2
F16
F15
F14
F13
F12
F35
F56
F76
F255
F36
F57
F255
F255
X
X
0
0
F97
F97
X
Slot 0
Slot 1
Slot 2
Slot 3
Slot 4
Slots 5-12
Slot 2
Valid
Slot 1
Valid
Slot 2
Valid
Codec
Ready
0
Bit Frame Position:
Figure 9. AC-link Input and Output Framing



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