參數(shù)資料
型號(hào): LM4540VH
廠(chǎng)商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 消費(fèi)家電
英文描述: AC ’97 Codec with National 3D Sound
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝: 7 X 7 MM, 1.40 MM HEIGHT, TQFP-48
文件頁(yè)數(shù): 12/16頁(yè)
文件大?。?/td> 298K
代理商: LM4540VH
Application Information
AC Link Serial Interface Protocol
AC Link Output Frame
The audio output frame (output from AC ’97 Controller) con-
tains control and PCM data targeted for the LM4540 control
registers and stereo DAC. The Tag slot, slot 0, contains 16
bits that tell theAC Link interface circuitry on the LM4540 the
validity of the following data slots.
A new audio output frame is signaled with a low to high tran-
sition of SYNC. SYNC is synchronous to the rising edge of
BIT_CLK. On the next rising edge of BIT_CLK, the AC ’97
Controller drives SD_OUT with the first bit of slot 0. The
LM4540 samples SD_OUT on the falling edge of BIT_CLK.
The AC ’97 Controller will continue outputting the SD_OUT
stream on each successive rising edge of BIT_CLK.
SD_OUT Slot 0: Tag Phase
The first bit of slot 0 is designated the
Valid Frame
bit. If
this bit is 1, it indicates that the current data frame contains
at least one slot of valid data and the LM4540 will further
sampled the next four bits to determine which frames do in
fact have valid data. Valid slots are signified by a 1 in their re-
spective slot bit position.
Bit
15
Description
Valid Frame
Control
register
address
Control
register data
Left Playback
PCM Data
Comment
1 = Valid Frame
14
1 = Valid slot
13
1 = Valid slot
12
1 = Valid slot
DS100906-4
FIGURE 3. AC 97 Bidirectional Audio Frame
DS100906-6
FIGURE 4. AC Link Audio Output Frame
DS100906-5
FIGURE 5. Start of Audio Output Frame
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