ndr不成功问题。

qq771520600

这是我CTS的设置，只设置了INV。
set cts_inv_cells [list CKINVM12H CKINVM16H  CKINVM20H CKINVM24H  CKINVM4H CKINVM6H CKINVM8H]

foreach libraryname $cts_inv_cells {
  echo "setDontUse $libraryname false"
  setDontUse $libraryname false
}



add_ndr -name cts_w2s2 -width_multiplier {ME3 2 ME4 1} -spacing_multiplier {ME3 2 ME4 1} -via {VI1 2 VI2 2 VI3 2}

create_route_type -name trunk_rule -non_default_rule cts_w2s2 -top_preferred_layer ME4 -bottom_preferred_layer ME3
set_ccopt_property route_type trunk_rule -net_type trunk

#=========== shielding =============
create_route_type \
-name VREF \
-top_preferred_layer ME4 \
-bottom_preferred_layer ME3 \
-preferred_routing_layer_effort high \
-non_default_rule cts_w2s2 \
-shield_net GND \
-shield_side both_side


目前出现三个问题，一是ndr还是按照默认设置，二是shilding没设置成功，缺少shape，不是很理解，三是balance的问题，我本来就没有设置buffer，但是不知道是不是这个原因。
1、#WARNING (NRDB-2120) Special net VREF is missing wiring shapes, will disable tie-net connections to this net.



2、Route type trimming info:
  No route type modifications were made.
**WARN: (IMPCCOPT-1183):        The library has no usable balanced buffers for power domain auto-default, while balancing clock_tree clk_generator_for_tx_clk<1>. If this is not intended behavior, you can specify a list of lib_cells to use with the buffer_cells property.



3、**WARN: (IMPCCOPT-1183):        The library has no usable balanced buffers for power domain auto-default, while balancing clock_tree clk. If this is not intended behavior, you can specify a list of lib_cells to use with the buffer_cells property.