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CS4299-BQ датащи(PDF) 10 Page - Cirrus Logic |
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CS4299-BQ датащи(HTML) 10 Page - Cirrus Logic |
10 / 52 page CS4299-BQ 10 2. GENERAL DESCRIPTION The CS4299-BQ is a mixed-signal serial audio Co- dec compliant to the Intel® Audio Codec ‘97 Spec- ification, 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 CS4299-BQ and the re- mainder of the system. The CS4299-BQ contains two distinct functional sections: digital and analog. The digital section includes the AC-link interface, S/PDIF interface, serial data port, Sample Rate Converters, and power management support. The analog section includes the analog input multiplex- er (mux), stereo output mixer, mono output mixer, stereo Analog-to-Digital Converters (ADCs), ste- reo Digital-to-Analog Converters (DACs), and their associated volume controls. 2.1 AC-Link All communication with the CS4299-BQ 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 CS4299-BQ and the control- ler. The input frame is driven from the CS4299-BQ on the SDATA_IN line. The output frame is driven from the controller on the SDATA_OUT line. The controller is also responsible for issuing reset com- mands via the RESET# signal. Following a Cold Reset, the CS4299-BQ is responsible for notifying the controller that it is ready for operation after syn- chronizing its internal functions. The CS4299-BQ 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 CS4299-BQ contains a set of AC ’97 compli- ant control registers and a set of Cirrus Logic de- fined control registers. These registers control the basic functions and features of the CS4299-BQ. Read accesses of the control registers by the AC ’97 controller are accomplished with the re- quested register index in Slot 1 of a SDATA_OUT frame. The following SDATA_IN frame will con- CODEC SYNC BIT_CLK SDATA_OUT SDATA_IN RESET# Digital AC'97 Controller Figure 7. AC-link Connections |
Аналогичный номер детали - CS4299-BQ |
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Аналогичное описание - CS4299-BQ |
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