Timingdrivenspacing timing driven spacing check box

-timing_driven_spacing
(“Timing driven spacing” check box
in the GUI)
When timing-driven spacing is enabled, Zroute adds space
between critical nets and nets that are parallel to them to
reduce the intralayer coupling capacitances.
By default, timing-driven spacing is not enabled.

Chapter 8: Routing Using Zroute
Setting Up for Routing 8-21
IC Compiler Implementation User Guide Version D-2010.03-SP2
To report the design-specific nondefault routing rules defined by the
define_routing_rule
command, use the
report_routing_rules
command. By default, this command reports all
of the nondefault routing rules for the current design. To limit the report to a specific
nondefault routing rule, specify the rule name as an argument to the command.
icc_shell> report_routing_rules rule_name
To output a Tcl script that contains the
define_routing_rule
commands used to define
the specified nondefault routing rule or all nondefault routing rules for the design if you do
not specify a routing rule, use the
-output
option when you run the
report_routing_rules
command.
Specifying the Routing Layers
IC Compiler lets you specify which layers can be ignored for routing and which layers are to
be ignored for RC and congestion estimation. You can also specify the routing layers to use
for specific nets (net layer constraints).
By default, when you set a maximum routing layer, it is a hard constraint. You can change it
to a soft constraint or you can allow the use of higher layers only for pin connections by
setting the
max_layer_mode
common route option. This option applies to both ignored
layers (
set_ignored_layers
command) and net layer constraints
(
set_net_routing_layer_constraints
command).
By default, when you set a minimum routing layer, it is a soft constraint. You can change it to
a hard constraint or you can allow the use of lower layers only for pin connections by setting
the
min_layer_mode
common route option. This option applies to both ignored layers
(
set_ignored_layers
command) and net layer constraints
(
set_net_routing_layer_constraints
command).
Specifying the Ignored Layers
To specify the ignored layers, use the
set_ignored_layers
command (or choose Route >
Routing Setup > Set Ignored Layers in the GUI). By default, RC estimation and congestion
analysis use the same layers as routing.
To specify the minimum and maximum routing layers, use the
-min_routing_layer
and
-max_routing layer
options, respectively. If you use only these options, the same layers
are used for routing, RC estimation, and congestion analysis. For example, to use layers M2
through M7 for routing, RC estimation, and congestion analysis, use the following command:
icc_shell> set_ignored_layers \
-min_routing_layer M2 -max_routing_layer M7

Chapter 8: Routing Using Zroute
Setting Up for Routing 8-22
IC Compiler Implementation User Guide D-2010.03-SP2
IC Compiler Implementation User Guide Version D-2010.03-SP2
To use fewer layers for RC estimation and congestion analysis than those used for routing,
use the
-rc_congestion_ignored_layers