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1 | ------------------------------------------------------------------------------- |
2 | Analog Devices AD1981A: AC'97 data | |
3 | ------------------------------------------------------------------------------- | |
4 | ||
5 | This is set of example captures of the AC'97 data on an Analog Devices | |
6 | AD1981A AC'97 2.2 audio codec. | |
7 | ||
8 | Details: | |
9 | https://en.wikipedia.org/wiki/AC%2797 | |
10 | https://www.analog.com/en/products/ad1981a.html | |
11 | ||
12 | ||
13 | Logic analyzer setup | |
14 | -------------------- | |
15 | ||
16 | The logic analyzer used was a Saleae Logic16 (at 50/100 MHz): | |
17 | ||
18 | Probe AD1981A | |
19 | ------------------- | |
20 | 0 BIT_CLK | |
21 | 1 SDATA_IN | |
22 | 2 SYNC | |
23 | 3 RESET# (only in the 50MHz captures) | |
24 | ||
25 | SDATA_OUT never toggled, so it was omitted. | |
26 | ||
27 | ||
28 | ac97_ad1981a_powerup1*.sr | |
29 | ------------------------- | |
30 | ||
31 | The data is the first chunk of traffic that occurs on an random mainboard | |
32 | (which contains the AD1981A) during BIOS power-up. | |
33 | ||
34 | ||
35 | ac97_ad1981a_powerup2*.sr | |
36 | ------------------------- | |
37 | ||
38 | Same as above, but this is a snippet of the second chunk of data that occurs | |
39 | a few seconds after the first chunk. |