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Ac 97 audio11/24/2023 ![]() However, slots can be combined to provide a 96 kHz sampling rate for the L, R and C channels. Normally, six channels are used for 5.1 surround sound, and three channels are available for modem use. Slots 1, 2 and 12 are used for non-audio data, while slots 3–11 carry up to nine channels of raw pulse-code modulation audio signals. The first (slot 0) is 16 bits long and contains validity flags for the remaining slots, while the remaining 240 bits are divided in twelve 20-bit slots (slots 1–12), used as data slots. This is therefore a time-division multiplexing scheme.Įvery frame is subdivided in 13 slots. The link carries a bidirectional serial data stream at a fixed bitrate (12.288 Mbit/s) between the controller and one or more codecs.Įach 12.288 Mbit/s stream is divided into 256-bit frames (frame frequency is 48 kHz). The first four are outputs from the controller, while sdata_in carries input from the codec. The AC-Link is a digital link that connects the DC97 (the controller) with the audio "codecs." It is composed of five wires: the 12.288 MHz clock, a 48 kHz sync signal, a reset signal, and two data wires which carry the actual audio data: sdata_out and sdata_in. This revision provides means for the audio codec to supply parametric data about its analog interface much like Intel High Definition Audio.
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