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93b92702 GS |
1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2017 Gerhard Sittig <gerhard.sittig@gmx.net> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | ''' | |
2787cf2a UH |
21 | AC'97 (Audio Codec '97) is a protocol for audio and modem I/O functionality |
22 | in mainstream PC systems. | |
93b92702 GS |
23 | |
24 | AC'97 communicates full duplex data (SDATA_IN, SDATA_OUT), where bits | |
25 | are clocked by the BIT_CLK and frames are signalled by the SYNC signals. | |
26 | A low active RESET# line completes the set of signals. | |
27 | ||
28 | Frames repeat at a nominal frequency of 48kHz, and consist of 256 bits | |
29 | each. One 16bit slot contains management information, twelve 20bit slots | |
30 | follow which carry data for three management and nine audio/modem channels. | |
31 | Optionally two slots of one frame can get combined for higher resolution | |
32 | on fewer channels, or double data rate. | |
2787cf2a UH |
33 | |
34 | Details: | |
35 | http://download.intel.com/support/motherboards/desktop/sb/ac97_r23.pdf | |
93b92702 GS |
36 | ''' |
37 | ||
38 | from .pd import Decoder |