參數(shù)資料
型號： AK4651
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16Bit ツヒ CODEC with MIC/HP/SPK-AMP
中文描述： 16位ツヒ編解碼器麥克風/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù)： 44/66頁
文件大?。?/td> 605K
代理商： AK4651
ASAHI KASEI
[AK4651]
MS0503-E-00
2006/04
- 44 -
Connection with Digital AC ’97 Controller
The AK4651 communicates with its companion AC ‘97 controller via a digital serial link, “AC-link”. All digital audio
streams, and command/status information are communicated over this point to point serial interconnect. A breakout of the
signals connecting the two is shown in the following figure.
AC’97
Controller
SYNC
AK4651
BITCLK
SDATAOUT
SDATAIN
RESETN
Figure 33. Connection between AK4651 and AC ’97 controller
RESETN
BITCLK
SYNC
SDATAIN
SDATAOUT
(Input) : Control signal to reset the AK4651
(Output) : 12.288MHz clock output from the AK4651
(Input) : Control signal to synchronize the AK4651 with AC’97 controller
(Output) : Data signal input to the controller (output from the AK4651)
(Input) : Data signal output to the controller (input from the AK4651)
Digital Interface
The AK4651 incorporates a 5 pin digital serial interface that links it to the AC ’97 controller. AC-link is a bi-directional,
fixed rate(48kHz), serial PCM digital stream. It handles input/output audio streams as well as control register accesses
employing a time division multiplexed (TDM) scheme. The AC-link architecture divides each audio frame into 12
outgoing and 12 incoming data streams, each with 20-bit sample resolution. DAC and ADC resolution of the AK4651 is
16 bit resolution. The data streams currently defined by the AC ‘97 specification include:
z
PCM Playback 2 output slots
2 channel composite PCM output stream
z
PCM Record data 2 input slots
1 channel composite PCM input stream
z
Control 2 output slots
Control register write port
z
Status 2 input slots
Control register read port
SYNC, fixed at 48kHz, is derived by dividing down the serial bit clock (BITCLK) output from the AK4651. BITCLK,
fixed at 12.288 MHz, provides the necessary clocking granularity to support 12, 20-bit outgoing and incoming time slots.
AC-link serial data is transitioned on each rising edge of BITCLK. The receiver of AC-link data, the AK4651 for
outgoing data and AC ’97 controller for incoming data, samples each serial bit on the falling edges of BITCLK.
The AC-link protocol provides for a special 16-bit slot (Slot 0) wherein each bit conveys a valid tag for its corresponding
time slot within the current audio frame. A “1” in a given bit position of slot 0 indicates that the corresponding time slot
within the current audio frame has been assigned to a data stream, and contains valid data. If a slot is “Tagged” invalid, it
is the responsibility of the source of the data (the AK4651 for the input stream, AC ’97 controller for the output stream),
to stuff all bit positions with 0’s during that slot’s active time.
SYNC remains high for a total duration of 16 BITCLKs at the beginning of each audio frame. The portion of the audio
frame where SYNC is high is defined as the “Tag Phase”. The remainder of the audio frame where SYNC is low is
defined as the “Data Phase”.
相關PDF資料
PDF描述
AK4651VG 16Bit ツヒ CODEC with MIC/HP/SPK-AMP
AK4665A 20-Bit Stereo CODEC with MIC/HP-AMP
AK4665AEN 20-Bit Stereo CODEC with MIC/HP-AMP
AK4671 Stereo CODEC with MIC/RCV/HP-AMP
AK4671EG Stereo CODEC with MIC/RCV/HP-AMP
相關代理商/技術參數(shù)
參數(shù)描述
AK4651VG 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP
AK4664VQ 功能描述:IC CODEC STEREO 20BIT LQFP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時間 標準包裝:1,000
AK4665A 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP
AK4665AEN 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP
AK4666VQ 功能描述:IC CODEC STEREO 20BIT LQFP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時間 標準包裝:1,000
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