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參數(shù)資料
| 型號： | AK4545 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | AC97 AUDIO CODEC WITH SRC AND DIT |
| 中文描述： | AC97聲音解碼器與SRC和DIT |
| 文件頁數(shù)： | 15/33頁 |
| 文件大?。?/td> | 363K |
| 代理商： | AK4545 |
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[ASAHI KASEI] [AK4545]
MS0058-E-00
2000/11
- 15 -
AC-link Input Frame(SDATA_IN)
Each AC-link frame consists of one 16bit tag phase and twelve 20bit slots used for data and control.
a)
Slot0
Slot0 is a special time frame, and consists of 16bits. Slot0 is also named the Tag phase. The AK4545 supports Bits
15-11. Each bit indicates 1=valid(normal operation) or ready, 0=invalid(abnormal operation) or not ready.
If the first bit in the slot 0 (Bit15) is valid, the AK4545 is ready for normal operation.
3
If the Codec Ready bit is
invalid, the following bits and remaining slots are all 0. AC97 controller should ignore the following bits in the
slot 0 and all other slots. When the ADC sampling rate is set for less than 48kHz, then Bits 12and 11 in slot 0
( corresponds to slot3 and slot4 respectively ) will be 1 s when valid data is transferred in SDATA_IN, and will be 0s
when no data is transmitted. ( On-demand ) base data transaction )
The next is the extracted description from AC97 Rev.2.1 ;
For variable sample rate input, the tag bit for each input slot indicates whether valid data is present or not. Thus,
even in variable sample rate mode, the Codec is always the master: for SDATA_IN (Codec to Controller), the Codec
sets the TAG bit; for SDATA_OUT (Controller to Codec), the Codec sets the SLOTREQ bit and then checks for the
TAG bit in the next frame. AK4545 expects Controller will reply TAG bit in the next frame correctly.
Bit 14 means that Slot 1(Status Address) output is valid or invalid. And Bit 13 means that Slot 2(Status Data ) is
valid or invalid.
The following table shows the relationship between Bit 14,13 and each Status of the AK4545.
Bit 15
(Codec Ready)
1
Bit 14
(Status Address)
1
Bit 13
(Status Data)
1
Status
There is a Read Command in the previous frame.
Then both Slot 1 and Slot 2 output normal data.
If the access to non-implemented register or odd register is requested, the
AK4545 returns valid 7-bit register address in slot 1 and returns valid0000h
data in slot 2 on the next AC-link frame.
Prohibited or non-existing
There is no Read Command in the previous frame.
Bits 19-12 and Bits 9-0 in Slot 1 are set to 0. And Slot2 outputs All0.
Prohibited or non-existing
1
1
1
0
0
0
1
0
1
Note 1). The above Read sequence is done as response for previous frames read command. That is, if the previous
frame is the Write Command, AK4545 outputs bit14 =0, bit13 =0 and slot 1&2 = All0, if there is no
SLOTREQ.
2). The Bits 14 and 13 in Slot 0 is independent of the SLOTREQ Bits 11 and 10 in Slot 1 which the AK4545
supports.
Bit12 means the output of Slot 3(PCM(ADC) Left) is valid or invalid. And Bit 11 means the output of Slot
4(PCM(ADC)Right) is valid or invalid. Bits10-0 are occupied with 0.
A new audio input frame begins with a low to high transition of SYNC. SYNC is synchronous to the rising edge of BIT_CLK. On the
immediately following falling edge of BIT_CLK, the AK4545 samples the assertion of SYNC. This falling edge marks the time when
both sides of AC-link are aware of the start of a new audio frame. On the next rising of BIT_CLK, the AK4545 transitions SDATA_IN
into the first bit position of slot 0 (“Codec Ready” bit). Each new bit position is presented to AC-link on a rising edge of BIT_CLK,
and subsequently sampled by the AC ’97 controller on the following falling edge of BIT_CLK. This sequence ensures that data
transitions, and subsequent sample points for both incoming and outgoing data streams are time aligned.
0
Bit4
1/0
1/0
Slot6
Slot7
Slot5
Slot4
Slot3
Slot2
Slot1
Codec
Ready
1/0
Bit15Bit14 Bit13 Bit12 Bit11 Bit10 Bit9
SYNC
Slot 1
SDATA_IN
BIT_CLK
1/0 1/0
0
Bit8
0
0
Slot12
0
0
Bit1 Bit0
0
Bit2
0
Bit3
Slot8
Slot11
0
Bit7
3
When the AC’ 97 is not ready for normal operation, output bits are not specified and should be ignored.
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| AK4545VQ | AC97 AUDIO CODEC WITH SRC AND DIT |
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相關代理商/技術參數(shù) |
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| AK4545VQ | 制造商:AKM 制造商全稱:AKM 功能描述:AC97 AUDIO CODEC WITH SRC AND DIT |
| AK4550 | 制造商:AKM 制造商全稱:AKM 功能描述:EVALUATION BOARD REV.C FOR AK4550 |
| AK4550VT | 制造商:AKM 制造商全稱:AKM 功能描述:LOW POWER & SMALL PACKAGE 16BIT CODEC |
| AK4550VT-E2 | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: |
| AK4550VTP-E2 | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:16BIT 3V |
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