Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Reexamination Certificate
2005-02-25
2010-12-07
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
C375S263000, C375S296000, C375S229000
Reexamination Certificate
active
07848396
ABSTRACT:
Methods, circuits, and systems for increasing bandwidth and/or transition separation in data communications and data storage in the presence of potential intersymbol interference (ISI). The method includes writing L bits of serial data per data transition period to a channel, reading data units from the channel M times per data transition period (M≦L), and determining a most likely value for a K*2(L-M)-bit binary sequence of the data. The circuit generally receives m-ary symbols, converts them to n-ary data, and includes detector logic that (i) calculates a most likely n-ary data sequence from L-unit blocks thereof, and (ii) disallows subsequent L-unit blocks in which there is a transition and any of the first x units do not equal any of the last y units in an immediately preceding block (where x+y=L). Generally, successive transitions in the serial data are at least L/M bit lengths apart. The algorithm(s) and software generally implement the method, and the receivers and systems generally include the circuit. By using certain coding techniques and increasing the transmitter/write clock frequency, bandwidth and/or minimum transition separation in run length limited (RLL) encoded data can be increased dramatically.
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Liu Shuwang
Marvell International Ltd.
Tayong Helene
LandOfFree
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