set_timing_cut_assignment (::quartus::project)

Belongs to ::quartus::project 5.0

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

1) export_assignments
2) 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 Prime 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.

## Set timing cut from any source points to dst1 and dst2
assignment_group "dst_group" -add_member dst1
assignment_group "dst_group" -add_member dst2
set_timing_cut_assignment -to "dst_group"

## or
assignment_group "src_group" -add_member *
assignment_group "dst_group" -add_member dst1
assignment_group "dst_group" -add_member dst2
set_timing_cut_assignment -from "src_group" -to "dst_group"

## Set timing cut from src1 and src2 to any end points
assignment_group "src_group" -add_member src1
assignment_group "src_group" -add_member src2
set_timing_cut_assignment -from "src_group"

## or
assignment_group "src_group" -add_member src1
assignment_group "src_group" -add_member src2
assignment_group "dst_group" -add_member *
set_timing_cut_assignment -from "src_group" -to "dst_group"