Method for providing automatic clock de-skewing on a circuit board
AssigneeUnisys Corporation
InventorsLaurence P. Flora, Michael A. McCullough
Life of this patent
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Abstract
A method of providing automatic clock de-skewing for integrated circuit chips carried by a multi-layer circuit board. In a preferred implementation of the method, a clock distribution chip includes on-chip automatic clock de-skewing circuitry requiring an accurate reference delay which is advantageously provided by a strip transmission line formed on one of the conductive planes of the multi-layer circuit board containing the chips.
Claims11
A method for automatically providing de-skewed clocks for a data processing system including a plurality of circuit boards constructed and arranged to receive integrated circuit chips, said method comprising the steps of:
- applying an input clock to each board;
- on each board, distributing de-skewed clocks to other chips on the board by performing automatic clock de-skewing in response to said input clock using an accurate reference delay to determine the amount of de-skewing required;
- and
- providing said accurate reference delay for each board by forming a transmission line therein.
Dependencies are inferred from the claim text.