Altera Quartus II Scripting Manual do Utilizador descarregar pdf (Página 471)

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Chapter 3: Tcl Packages & Commands 3–341

sdc_ext

set_scc_mode

Usage

set_scc_mode [-size <size>] [-use_heuristic]

Options

-size <size>: Maximum SCC loop size

-use_heuristic: Always use heuristic for SCC processing

Description

Allows you to set maximum Strongly Connected Components (SCC) loop size or force TimeQuest Timing

Analyzer to always estimate delays through SCCs.

When TimeQuest Timing Analyzer encounters a loop of size greater than the specified maximum SCC

loop size, it uses a heuristic which only estimates delays through the loop.

If the loop is smaller than the maximum SCC loop size, a full processing of loops is performed unless the

-use_heuristic option is used.

Example

# Make TimeQuest Timing Analyzer use normal processing for all loops

# the size of which is less than or equal to 100. For loops of size

# greater than 100, a runtime-saving heuristic will be used

set_scc_mode -size 100

# Force TimeQuest Timing Analyzer to use heuristic for all SCCs

# disregarding their size

set_scc_mode -use_heuristic

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