get_fanouts Constraint

get_fanouts [-no_logic] -through <names> <start point>

This command returns a string of fanout ports and registers. This command supports the following options

-no_logic if used, the software does not follow combinational timing arcs
-through pins, cells or nets (see -through Option for supported use cases)
<names> can be a net, cell, or pin
<start point> is a port, pin, or net

By default, the get_fanouts command traces through combinational timing arcs.

The following example sets different multicycle path constraints for registers based on the flipflops' enable signals. The get_fanout SDC command finds which registers are controlled by the specific enable signals.

create_clock -period 10.00 -name clkin [get_ports clkin]
set_multicycle_path -setup -from [get_clocks clkin] -to [get_fanouts ce_y] 4
set_multicycle_path -hold -from [get_clocks clkin] -to [get_fanouts ce_y] 3
set_multicycle_path -setup -from [get_clocks clkin] -to [get_fanouts ce_x] 2
set_multicycle_path -hold -from [get_clocks clkin] -to [get_fanouts ce_x] 1

Note: This constraint returns a string, not an Efinity Tcl object. Therefore, you cannot use it in a nested format with object specifiers such as get_nets or get_cells.