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CS4297A-JQZ 参数 Datasheet PDF下载

CS4297A-JQZ图片预览
型号: CS4297A-JQZ
PDF下载: 下载PDF文件 查看货源
内容描述: 清澈如水晶™ SoundFusion ™音频编解码器'97 [CrystalClear㈢ SoundFusion⑩ Audio Codec ‘97]
分类和应用: 解码器编解码器消费电路商用集成电路
文件页数/大小: 52 页 / 1251 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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CS4297A  
ary audio codecs. Both input and output AC-link  
audio frames are organized as a sequence of 256 se-  
rial bits forming 13 groups referred to as ‘slots’.  
During each audio frame, data is passed bi-direc-  
tionally between the CS4297A and the controller.  
The input frame is driven from the CS4297A on the  
SDATA_IN line. The output frame is driven from  
the controller on the SDATA_OUT line. The con-  
troller is also responsible for issuing reset com-  
mands via the RESET# signal. Following a Cold  
Reset, the CS4297A is responsible for notifying the  
controller that it is ready for operation after syn-  
chronizing its internal functions. The CS4297A  
AC-link signals must use the same digital supply  
voltage as the controller chip, either +5 V or  
+3.3 V. See Section 3, AC Link Frame Definition,  
for detailed AC-link information.  
2. GENERAL DESCRIPTION  
The CS4297A is a mixed-signal serial audio Codec  
compliant to the Intel® Audio Codec ‘97 Specifica-  
tion, revision 2.1 [1]. It is designed to be paired  
with a digital controller, typically located on the  
PCI bus or integrated within the system core logic  
chip set. The controller is responsible for all com-  
munications between the CS4297A and the remain-  
der of the system. The CS4297A contains two  
distinct functional sections: digital and analog. The  
digital section includes the AC-link interface,  
S/PDIF interface, serial data port, and power man-  
agement support. The analog section includes the  
analog input multiplexer (mux), stereo output mix-  
er, mono output mixer, stereo Analog-to-Digital  
Converters (ADCs), stereo Digital-to-Analog Con-  
verters (DACs), and their associated volume con-  
trols.  
2.2  
Control registers  
2.1  
AC-Link  
The CS4297A contains a set of AC ’97 compliant  
All communication with the CS4297A is estab- control registers and a set of Cirrus Logic defined  
lished with a 5-wire digital interface to the control- control registers. These registers control the basic  
ler, as shown in Figure 7. This interface is called functions and features of the CS4297A. Read ac-  
the AC-link. All clocking for the serial communi-  
cation is synchronous to the BIT_CLK signal.  
BIT_CLK is generated by the primary audio codec  
cesses of the control registers by the AC ’97 con-  
troller are accomplished with the requested register  
index in Slot 1 of a SDATA_OUT frame. The fol-  
and is used to clock the controller and any second- lowing SDATA_IN frame will contain the read  
Digital AC97  
Controller  
CODEC  
SYNC  
BIT_CLK  
SDATA_OUT  
SDATA_IN  
RESET#  
Figure 7. AC-link Connections  
10  
DS318PP6  
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