Circuit to observe internal clock and control signals in a...

Details Circuit to observe internal clock and control signals in a... Circuit to observe internal clock and control signals in a...

2008-01-01

2008-01-01

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Input noise margin enhancement

C326S021000, C326S030000, C326S031000

Reexamination Certificate

active

07315182

ABSTRACT:
A serial data receiver circuit includes a pair of differential input nodes, and receiver circuitry and a termination circuit coupled between the differential input nodes. The termination circuit comprises a common mode node. A common mode control circuit is connected to the common mode node, and exhibits a substantially zero output impedance. In so doing, the common mode control circuit provides a common mode voltage to the common mode node of the termination circuit that exhibits substantially ideal termination of common mode signals and negligible loading on the differential input nodes. In another aspect, selection circuitry is provided that selectively passes single-ended or differential test signals to the differential input nodes during a test mode of operation. The selection circuitry facilitates observation of signals within the receiver circuitry.

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