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參數(shù)資料
| 型號： | LM4548AVH/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大小： | 538K |
| 代理商： | LM4548AVH/NOPB |
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Multiple Codecs (Continued)
When reading from a Secondary Codec, the controller must
send the correct Codec ID bits (i.e. the target Codec Identity
in slot 0, bits 1 and 0) along with the read-request bit (slot 1,
bit 19) and target register address (slot 1, bits 18 – 12). To
write to a Secondary Codec, a controller must send the
correct Codec ID bits when slot 1 contains a valid target
register address and “write” indicator bit and slot 2 contains
valid target register data. A write operation is only valid if the
register address and data are both valid and sent within the
same frame. When accessing the Primary Codec, the Codec
ID bits are cleared and the tag bits 14 and 13 resume their
role indicating the validity of Command Address and Data in
slots 1 and 2.
The use of the tag bits in Input Frames (carried by the
SDATA_IN signal) is the same for Primary and Secondary
Codecs.
The Codec Identity is determined by the input pins ID1#,
ID0# (pins 46 and 45) and can be read as the value of the
ID1, ID0 bits (D15, D14) in the Extended Audio ID register,
28h of the target codec.
Slots in the AC Link Output Frame are always mapped to
carry data to the left DAC channel in slot 3 and data to the
right DAC channel in slot 4. Similarly, slots in AC Link Input
Frames are always mapped such that PCM data from the left
ADC channel is carried by slot 3 and PCM data from the right
ADC channel by slot 4. Output Frames are those carried by
the SDATA_OUT signal from the controller to the codec
while Input Frames are those carried by the SDATA_IN
signal from the codec to the controller.
SLOT 0: TAG bits in Output Frames (controller to codec)
Bit 15
14
13
12
11
10
987654321
0
Valid
Frame
Slot 1
Valid
Slot 2
Valid
Slot 3
Valid
Slot 4
Valid
XXXXXXXXX
ID1
ID0
Extended Audio ID register (28h): Support for Multiple Codecs
Reg
Name
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
28h
Extended
Audio ID
ID1
ID0
XXXXXXXXXXXXX
VRA
X001h
LM4548A
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4548AVHX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4548VH | 制造商:Texas Instruments 功能描述: |
| LM4549 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
| LM4549A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
| LM4549AVH | 制造商:Rochester Electronics LLC 功能描述:AC97 REV2.1 CODEC - Bulk 制造商:OC White Company 功能描述:Audio Codec 2ADC / 2DAC 18-Bit 48-Pin LQFP Tray |
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