International Business Machines Corporation

Christopher G Riedle

John William Marshall

Brian R Buchanan

Carl Thomas Gray

Raymond Paul Rizzo

Alain R Blanc

Daniel Wind

Robert Glen Gerowitz

Jean-Claude Abbiate

An apparatus and method that correct skew associated with data receive from different transmission links. A known training pattern is sent through the transmission links. The training pattern is recovered and forwarded through delay registers/selecter logic to a memory buffer. A programmed controller accesses the memory and searches for the training pattern. If the training pattern is found for each transmission link, the offsets between the transmission links are determined and are used by the delay registers/selecter logic to adjust the position of the pattern so that the patterns from each link is linearly aligned within the memory buffer.

Data alignment compensator

An apparatus and process for updating a sample time in a serial link which converts serial data in parallel data. A delay line stores multiple samples of at least two data bits received over the serial link. The contents of the delay line are matched so that they can be analyzed by a processor to determine an optimum sampling position in the delay line. The processor is programmed to analyze contents of the latch by creating a sample mask from a plurality of delay line samples. The sample mask identifies transition edges of first and second data bits within the delay line. The transition edges are validated with respect to the presence, for first and second initial sampling positions for the respective data bits. New sampling positions are determined from the validated edges, and the initial sampling positions are updated with sampling positions which have been determined from the new sampling positions. In this way phase jitter induced by environmental concerns is minimized using new sampling positions along the delay line for coding the data into parallel data.

Method and apparatus for locating sampling points in a synchronous data stream

A device and method that adjust data due to temperature variations is disclosed. The data is captured in a multi-stage delay line. A first controller parses the data and identifies an Edge value and an Edge value for bits in the delay line. The edge values are used to generate signals that set a Multiplexer (MUX ) and a Multiplexer (MUX ) to select bits from the delay line. A second controller processes an edge sample from bits in the delay line to determine if the data has shifted in the delay line relative to the current multiplexer settings. An edge sample is a snapshot of the delay line values. The new edge values generated by the second controller are selectively filtered and integrated with initial edge values to generate new settings for the MUX and MUX

System that compensates for variances due to process and temperature changes

A system normally converts a parallel data word to a single serial data stream to use a high speed serial link. The parallel data word is partitioned into N sub-sets or nibbles and each nibble is then serialized and transmitted over N serial links using high speed differential drivers. Each of the N serialized nibbles are received in a differential receiver. The serialized nibbles are then coverted back into N parallel nibbles and the N parallel nibbles are then assembled back to the original parallel data word. To increase reliability, the received data is coupled to a tapped delay element having M stages of delay. A training sequence and algorithm are used to determine which of the taps of the delay element are a desired delay distance away from data transitions. These taps are then used to sample the incoming signals to reconstruct the parallel data word.

Initialization system for recovering bits and group of bits from a communications channel

An interface system that conveys data at approximately 500 MBitsps between modules. The interface system performs multistream serialization at the transmitter and multistream de-serialization at the Receiver. As a consequence, fewer interface connections are required between the modules.

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Apex, NC, United States of America

Christopher G Riedle