Ac’97 controller (ac’97c), 1 description – Rainbow Electronics AT91CAP9S250A User Manual

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6264A–CAP–21-May-07

AT91CAP9S500A/AT91CAP9S250A

37. AC’97 Controller (AC’97C)

37.1

Description

The AC‘97 Controller is the hardware implementation of the AC’97 digital controller (DC’97)
compliant with AC’97 Component Specification 2.2. The AC’97 Controller communicates with
an audio codec (AC’97) or a modem codec (MC’97) via the AC-link digital serial interface. All
digital audio, modem and handset data streams, as well as control (command/status) informa-
tions are transferred in accordance to the AC-link protocol.

The AC’97 Controller features a Peripheral DMA Controller (PDC) for audio streaming trans-
fers. It also supports variable sampling rate and four Pulse Code Modulation (PCM) sample
resolutions of 10, 16, 18 and 20 bits.