Determining Worst-Case Bit Patterns Based Upon Data-Dependent Jitter
AssigneeMentor Graphics Corporation
InventorVladimir Dmitriev-Zdorov
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Abstract
The patent application discloses mechanisms that, for a given channel step or edge response, bit interval, and data dependent jitter table can directly determine the minimal eye or bit error rate opening by building a worst case pattern considering the effect of data dependent jitter. These mechanisms can be based on building an indexed table of jitter samples, preparing a structure in the form of connected elements corresponding to the jitter samples, and then applying dynamic programming to determine paths through the connected elements.
Claims7
1-6. (canceled)
A method comprising:
- identifying, by a computing system, data-dependent jitter and a step response associated with a channel;
- deriving, by the computing system, a sequence pattern for input into the channel based, at least in part, on the data-dependent jitter and the step response associated with the channel;
- and
- determining, by the computing system, a bit error rate for the channel based, at least in part, on the sequence pattern.
An apparatus comprising at least one computer-readable memory device storing instructions configured to cause one or more processing devices to perform operations comprising:
- identifying data-dependent jitter and a step response associated with a channel;
- deriving a sequence pattern for input into the channel based, at least in part, on the data-dependent jitter and the step response associated with the channel;
- and
- determining a bit error rate for the channel based, at least in part, on the sequence pattern.
Dependencies are inferred from the claim text.