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CS4297A-KQ Scheda tecnica(PDF) 10 Page - Cirrus Logic |
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CS4297A-KQ Scheda tecnica(HTML) 10 Page - Cirrus Logic |
10 / 52 page CS4297A 10 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. 2.1 AC-Link All communication with the CS4297A is estab- lished with a 5-wire digital interface to the control- ler, as shown in Figure 7. This interface is called 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 and is used to clock the controller and any second- 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. 2.2 Control registers The CS4297A contains a set of AC ’97 compliant control registers and a set of Cirrus Logic defined control registers. These registers control the basic functions and features of the CS4297A. Read ac- 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- lowing SDATA_IN frame will contain the read CODEC SYNC BIT_CLK SDATA_OUT SDATA_IN RESET# Digital AC’97 Controller Figure 7. AC-link Connections |
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