Mentor v8.6_4 manual Report Observe Data

Command Dictionary Report Observe Data

Report Observe Data

Tools Supported: FastScan

Scope: Atpg, Good, and Fault modes

Prerequisites: You must use the Analyze Observe command prior to this command.

Usage

REPort OBserve Data [filename] [-Replace]

Description

Displays information from the preceding Analyze Observe command.

The Report Observe Data command displays a summary of the information that FastScan obtained from the preceding Analyze Observe command.

When the Analyze Observe command fails to detect an output pin for a minimum number of the random patterns (as defined by the observe threshold), FastScan identifies the output pin as inadequately observed. For each inadequately- observed output pin the Analyze Observe command searches for the potential source of the pin’s observe problem. This it calculates by tracing forward from the pin through the most difficult-to-observe fanout gate until it reaches a gate which has no fanout and an observability value less than the threshold.

The Report Observe Data command’s summary report lists up to a maximum of 25 source gates, which, if made observable, would affect a maximum number of other gates. The command orders the list of gates by the low-observability gates and includes the low-observability pins, the number of times observed, and the calculated source gate.

You can write the summary report to a file by specifying a filename.

You use this command primarily when simulating Built-In Self Test (BIST) circuitry.

FastScan and FlexTest Reference Manual, V8.6_4 2-347