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Diffstat (limited to 'decoders/ac97/__init__.py')
| -rw-r--r-- | decoders/ac97/__init__.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/decoders/ac97/__init__.py b/decoders/ac97/__init__.py new file mode 100644 index 0000000..8b96e8a --- /dev/null +++ b/decoders/ac97/__init__.py @@ -0,0 +1,36 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2017 Gerhard Sittig <gerhard.sittig@gmx.net> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 2 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, see <http://www.gnu.org/licenses/>. +## + +''' +AC'97 (Audio Codec '97) was specifically designed by Intel for audio and +modem I/O functionality in mainstream PC systems. See the specification in +http://download.intel.com/support/motherboards/desktop/sb/ac97_r23.pdf + +AC'97 communicates full duplex data (SDATA_IN, SDATA_OUT), where bits +are clocked by the BIT_CLK and frames are signalled by the SYNC signals. +A low active RESET# line completes the set of signals. + +Frames repeat at a nominal frequency of 48kHz, and consist of 256 bits +each. One 16bit slot contains management information, twelve 20bit slots +follow which carry data for three management and nine audio/modem channels. +Optionally two slots of one frame can get combined for higher resolution +on fewer channels, or double data rate. +''' + +from .pd import Decoder |