ng45: reduce the metal7 pdn strap pitch 40->30

The fakeram45_64x7 is only 36.4um tall and may fall in-between strapes.

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/platforms/nangate45/grid_strategy-M1-M4-M7.tcl

@@ -17,7 +17,7 @@ set_voltage_domain -name {CORE} -power {VDD} -ground {VSS}
 define_pdn_grid -name {grid} -voltage_domains {CORE}
 add_pdn_stripe -grid {grid} -layer {metal1} -width {0.17} -pitch {2.4} -offset {0} -followpins
 add_pdn_stripe -grid {grid} -layer {metal4} -width {0.48} -pitch {56.0} -offset {2}
-add_pdn_stripe -grid {grid} -layer {metal7} -width {1.40} -pitch {40.0} -offset {2}
+add_pdn_stripe -grid {grid} -layer {metal7} -width {1.40} -pitch {30.0} -offset {2}
 add_pdn_connect -grid {grid} -layers {metal1 metal4}
 add_pdn_connect -grid {grid} -layers {metal4 metal7}
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