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This article is related to information contained in other articles on pages 2826-2830 and 2836-2839 of this issue.
English (United States)
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Interface Between Timing Analysis Runs for Automatic Transfer of Timing
This article is related to information contained in other articles on pages
2826-2830 and 2836-2839 of this issue.
As a Timing Analysis (TA) run is made, data associated with the Primary
Inputs (PIs) and Primary Outputs (POs) in the partition are saved. Since this
data is intended for partition(s) other than the current partition, a Primary Input
would become Primary Output of its adjacent partition. Its arrival time and slack
values are converted to required arrival time. Similarly, a Primary Output would
be saved as a Primary Input with a defined arrival time.
The data set on which this information is saved is to be automatically
accessed, updated, and maintained. By using this data set, setting of Primary
Inputs and Primary Outputs in a partition can be automated, thereby reducing
potential errors in manual methods.
Information in the master data set can be manipulated under the user's
controls. In general, these controls can be summarized as follows:
Under user control, TA is able to access the data set for each edge of a PI of
a given partition. The arrival time and sigma pairs at the edge for each PO in the
net but not in the same partition are examined. For long path runs, the pair with
the maximum (nominal + beta sigma) point is returned (minimum (nominal - beta
sigma) point for short path runs).
Under user control, TA is able to access the data set for each edge of a PO