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LM4550 датащи(PDF) 16 Page - National Semiconductor (TI) |
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LM4550 датащи(HTML) 16 Page - National Semiconductor (TI) |
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16 / 25 page ![]() Application Information AC Link Serial Interface Protocol AC Link Output Frame: SDATA_OUT (output from controller, input to LM4550) The audio output frame (output from AC ’97 Controller) contains control and PCM data targeted for the LM4550 control registers and stereo DAC. The Tag slot, slot 0, con- tains 16 bits that tell the AC Link interface circuitry on the LM4550 the validity of the following data slots. A new audio output frame is signaled with a low to high transition 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 SDATA_OUT with the first bit of slot 0. The LM4550 samples SDATA_OUT on the falling edge of BIT- _CLK. The AC ’97 Controller will continue outputting the SDATA_OUT stream on each successive rising edge of BIT_CLK. SDATA_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 LM4550 will further sample the next four bits and slots7&8and6&9to determine which frames do in fact have valid data. Valid slots are signified bya1in their respective slot bit position. 10097204 FIGURE 3. AC 97 Bidirectional Audio Frame 10097206 FIGURE 4. AC Link Audio Output Frame 10097205 FIGURE 5. Start of Audio Output Frame www.national.com 16 |
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