Altera SDC and TimeQuest API Manuel d'utilisateur télécharger pdf (Page 72)

2–62 Chapter 2: SDC and TimeQuest API Package and Commands

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SDC and TimeQuest API Reference Manual © December 2009 Altera Corporation

set_time_format

Usage

set_time_format [-decimal_places <decimal_places>] [-unit <unit>]

Options

-decimal_places <decimal_places>: Number of decimal places to use

-unit <unit>: Default time unit to use

Description

Sets time format, including time unit and decimal places.

Time units are assumed to be nanoseconds (ns) by default. The "-unit" option overrides the default time

units. Legal time unit values are: ps, ns, us, ms.

Time units are displayed with three decimal places by default. The "-decimal_places" option overrides the

default number of decimal places to show.

The smallest resolution of all times units is one picosecond (ps). Any additional specified precision will be

truncated.

Example

# Create two clocks with a clock period of 8 nanoseconds.

create_clock -period 8.000 clk1

set_time_format -unit ps -decimal_places 0

create_clock -period 8000 clk2

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Altera SDC and TimeQuest API Manuel d'utilisateur Page 72