Altera Quartus II Scripting Instrukcja Użytkownika Pobierz pdf (Strona 630)

100

101

3–500 Chapter 3: Tcl Packages & Commands

timing_assignment

set_timing_cut_assignment

Usage

set_timing_cut_assignment [-comment <comment>] [-disable] [-from <from_pin_list>]

[-remove] [-tag <data>] [-to <to_pin_list>]

Options

-comment <comment>: Comment

-disable: Option to disable assignment

-from <from_pin_list>: List of start or source node names and/or assignment group names

for timing path, for example, {node1 node2 ...}

-remove: Option to remove timing cut assignment

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

-to <to_pin_list>: List of end node names and/or assignment group names for timing path,

for example, {node1 node2 ...}

Description

Specifies that the timing paths that start from the designated <from_pin_list> and end in the designated

<to_pin_list> are false paths.

Nodes for the <from_pin_list> can be input pins, internal nodes, clock pins, or assignment groups. Nodes

for the <to_pin_list> can be output pins, internal nodes, clock pins, or assignment groups.

You must use either the "-from <from_pin_list>" or the "-to <to_pin_list>" option.

Note that Quartus®II timing analysis is optimized to use assignment groups for timing constraints instead

of a list of nodes. Of the following two methods to make timing cut assignments, method (1) is the optimal

method.

(1)

assignment_group "src_group" -add_member "s1"

assignment_group "src_group" -add_member "s2"

assignment_group "src_group" -add_member "s3"

assignment_group "dst_group" -add_member "d1"

assignment_group "dst_group" -add_member "d2"

set_timing_cut_assignment -from "src_group" -to "dst_group"

(2) set_timing_cut_assignment -from {s1 s2 s3} -to {d1 d2}

For more information about assignment groups, type "assignment_group -h".

The "assignment_group" command replaces the deprecated "timegroup" command in ::quartus::project,

version 5.0.

Assignments created or modified by using this Tcl command are not saved to the Quartus II Settings File

(.qsf) unless you explicitly call one of the following two Tcl commands:

■ export_assignments

■ project_close (unless "-dont_export_assignments" is specified)

These two Tcl commands reside in the ::quartus::project Tcl package. You must save assignment changes

before you run Quartus®II command-line executables. Note, however, that the Tcl commands

"execute_flow" and "execute_module" (part of the ::quartus::flow Tcl package) automatically call

"export_assignments" before they run command-line executables.

1 2 ... 625 626 627 628 629 630 631 632 633 634

Komentarze do niniejszej Instrukcji

Brak uwag

Altera Quartus II Scripting Instrukcja Użytkownika Strona 630

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Urządzenia pomiarowe Altera Quartus II Scripting