Altera Quartus II Scripting Manual de usuario descargar pdf (Pagina 615)

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Chapter 3: Tcl Packages & Commands 3–485

timing_assignment

create_base_clock

Usage

create_base_clock [-comment <comment>] [-disable] [-duty_cycle <integer>] [-entity

<entity>] -fmax <fmax> [-no_target] [-tag <data>] [-target <name>] [-virtual]

<clock_name>

Options

-comment <comment>: Comment

-disable: Option to disable assignment

-duty_cycle <integer>: Duty cycle

-entity <entity>: Entity to which to add clock assignment

-fmax <fmax>: Clock frequency

-no_target: Option to not assign clock to node

-tag <data>: Option to tag data to this assignment

-target <name>: Clock node name

-virtual: Option to specify the clock as a virtual clock

<clock_name>: Clock name

Description

Creates the base clock. The base clock is an absolute clock.

The "-fmax" option can take the format:

For example, if the fmax is 10.55ns, "10.55" is the <floating point time value> and "ns" is the <time unit>.

The following table displays possible time units:

If you specify the "-virtual" option, the base clock is not assigned to any node in the timing netlist. You

cannot specify the "-virtual" option and the "-target" option at the same time.

For entity-specific assignments, use the "-entity" option to force the assignment to specified entity. If you

do not specify the "-entity" option, the value for the FOCUS_ENTITY_NAME assignment is used. If the

FOCUS_ENTITY_NAME value is not found, the revision name is used.

Time Unit Description

s second(s)

ms millisecond(s)

us microsecond(s)

ns nanosecond(s)

ps picosecond(s)

fs femtosecond(s)

Hz hertz

KHz kilohertz

MHz megahertz

GHz gigahertz

1 2 ... 610 611 612 613 614 615 616 617 618 619 620 ... 633 634

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