Method and apparatus for enumerating devices on a link

Details Method and apparatus for enumerating devices on a link Method and apparatus for enumerating devices on a link

2006-10-17

2006-10-17

Dang, Khanh (Department: 2111)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

C710S010000, C710S110000

Reexamination Certificate

active

07124208

ABSTRACT:
Embodiments of the present invention provide for enumerating codecs on a link. A controller asserts a synchronization signal, and drives one or more control lines associated with selected codecs to a first state. The enumeration period is defined by a predefined number of clock periods after de-assertion of the synchronization signal. During the enumeration period, the controller drives the control lines of codecs that are supported to a second state. If the control line for a codec is not pulled to the second state during the enumeration period, that codec will act disabled, ignoring all inputs, and will not participate in any link activity, until the next reset, where it will again look for an assertion of its control line.

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Audio Codec 97, Technical FAQ Sheet, Rev. 1.0, Intel, 1996.
AC97 Rev. 2.1 Codec with Sample Rtae Conversion and National 3D Sound, National Semiconductor, Sep. 2000.

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