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13 AC'97 and HD Audio
13.1 Signals Definition
The COM Express specification allocates seven pins on the A-B connector to support digital AC'97 and
HD interfaces to audio codecs on the carrier board. The pins are available on all module types. High-
definition (HD) audio uses the same digital-signal interface as AC '97 audio. Codecs for AC '97 and HD
audio are different.
Table 17 Audio Codec Description of Signals
Page 70 of 103
COM Express Carrier Type 2
Design Guide
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