US 2010/0074391 A1Published application

Shift Register with Dynamic Entry Point Particularly Useful for Aligning Skewed Data

AssigneeCisco Technology, Inc., a corporation of California

InventorsKenneth Michael Rose, Matthew Todd Lawson

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Abstract

Disclosed are, inter alia, methods, apparatus, computer-storage media, mechanisms, and means associated with a shift register with a dynamic entry point, which may particularly useful for aligning skewed data. The dynamic entry shift register typically includes a series of storage elements, with multiplexers distributed between the storage elements. Each of the multiplexers is configured to select between: (a) the output signal of a previous storage element, and (b) the input signal. A control is configured to configure the multiplexers for a data signal applied as the input signal to induce an appropriate delay of the data signal as the output signal. The dynamic entry shift register can be scaled to accommodate a longer delay while still using only 2:1 multiplexers between stages in the dynamic entry shift register(s).

Claims23

Dependent claims

An apparatus, comprising:

a dynamic entry shift register;
wherein the dynamic entry shift register includes:
a shift register including a series of a plurality of storage elements, with the first element of the series of the plurality of storage elements configured to receive an input signal, and with the last element of the series of the plurality of storage elements configured to produce an output signal;
a plurality of multiplexers distributed between the plurality of storage elements, with each of the plurality of multiplexers configured to select as its output between:
(a) the output signal of a previous storage element in the series of the plurality of storage elements, and (b) the input signal;
and with the output of each of the plurality of multiplexers coupled to the input of the next storage element in the series of the plurality of storage elements;
and
a control configured to control the plurality of multiplexers for a data signal applied as the input signal to induce an appropriate delay of the data signal as the output signal.

5 more elements

Dependencies are inferred from the claim text.