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