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型號(hào)：	MD80C32U-30:D
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	MICROCONTROLLER
文件頁(yè)數(shù)：	68/1262頁(yè)
文件大?。?/td>	3503K

11028E–ATARM–22-Apr-13

Variable Sample Rate

The problem of variable sample rate can be summarized by a simple example. When passing a

44.1 kHz stream across the AC-link, for every 480 audio output frames that are sent across, 441

of them must contain valid sample data. The new AC97 standard approach calls for the addition

of “on-demand” slot request flags. The AC97 Codec examines its sample rate control register,

the state of its FIFOs, and the incoming SDATA_OUT tag bits (slot 0) of each output frame and

then determines which SLOTREQ bits to set active (low). These bits are passed from the AC97

Codec to the AC97 Controller in slot 1/SLOTREQ in every audio input frame. Each time the

AC97 controller sees one or more of the newly defined slot request flags set active (low) in a

given audio input frame, it must pass along the next PCM sample for the corresponding slot(s) in

the AC-link output frame that immediately follows.

The variable Sample Rate mode is enabled by performing the following steps:

Setting the VRA bit in the AC97 Controller Mode Register (AC97C_MR).

Enable Variable Rate mode in the AC97 Codec by performing a transfer on the Codec

Slot 1 of the input frame is automatically interpreted as SLOTREQ signaling bits. The AC97 Con-

troller will automatically fill the active slots according to both SLOTREQ and AC97C_OCA

Power Management

Powering Down the AC-Link

The AC97 Codecs can be placed in low power mode. The application can bring AC97 Codec to

a power down state by performing sequential writes to AC97 Codec powerdown register. Both

the bit clock (clock delivered by AC97 Codec, AC97CK) and the input line (AC97RX) are held at

a logic low voltage level. This puts AC97 Codec in power down state while all its registers are

still holding current values. Without the bit clock, the AC-link is completely in a power down

The AC97 Controller should not attempt to play or capture audio data until it has awakened

To set the AC97 Codec in low power mode, the PR4 bit in the AC97 Codec powerdown register

(Codec address 0x26) must be set to 1. Then the primary Codec drives both AC97CK and

AC97RX to a low logic voltage level.

The following operations must be done to put AC97 Codec in low power mode:

Disable Channel A clearing CEN field in the AC97C_CAMR register.

Disable Channel B clearing CEN field in the AC97C_CBMR register.

Write 0x2680 value in the AC97C_COTHR register.

Poll the TXEMPTY flag in AC97C_CxSR registers for the 2 channels.

At this point AC97 Codec is in low power mode.

Waking up the AC-link

There are two methods to bring the AC-link out of low power mode. Regardless of the method, it

is always the AC97 Controller that performs the wake-up.

相關(guān)PDF資料	PDF描述
MC80C52XXX-20/883	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
IC80C52CXXX-36D	8-BIT, MROM, 36 MHz, MICROCONTROLLER, CDIP40
IT80C52CXXX-L16:RD	8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44
IR80C52XXX-30SHXXX:RD	8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQCC44
MC80C32E-36/883:D	8-BIT, 36 MHz, MICROCONTROLLER, CDIP40

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MD80C51	制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 44 MHz Single-Chip 8 Bit Microcontroller
MD80C51BH	制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space
MD80C51FB	制造商:Rochester Electronics LLC 功能描述:
MD80C86	制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor
MD80C862	制造商:Intel 功能描述:PROCESSOR:MICRO-PROCESSOR

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