asap7: tighten the M5 & M6 pdn pitch

The previous values were extremely far apart.  This is probably still too
far but it at least fixes riscv32i.  Further discussion is needed to
find a truly realistic setting.

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

Author: maliberty

flow/platforms/asap7/openRoad/pdn/grid_strategy-M1-M2-M5-M6.tcl

@@ -17,8 +17,8 @@ set_voltage_domain -name {CORE} -power {VDD} -ground {VSS}
 define_pdn_grid -name {top} -voltage_domains {CORE}
 add_pdn_stripe -grid {top} -layer {M1} -width {0.018} -pitch {0.54} -offset {0} -followpins
 add_pdn_stripe -grid {top} -layer {M2} -width {0.018} -pitch {0.54} -offset {0} -followpins
-add_pdn_stripe -grid {top} -layer {M5} -width {0.12} -spacing {0.072} -pitch {11.88} -offset {0.300}
-add_pdn_stripe -grid {top} -layer {M6} -width {0.288} -spacing {0.096} -pitch {12} -offset {0.513}
+add_pdn_stripe -grid {top} -layer {M5} -width {0.12} -spacing {0.072} -pitch {5.4} -offset {0.300}
+add_pdn_stripe -grid {top} -layer {M6} -width {0.288} -spacing {0.096} -pitch {5.4} -offset {0.513}
 add_pdn_connect -grid {top} -layers {M1 M2}
 add_pdn_connect -grid {top} -layers {M2 M5}
 add_pdn_connect -grid {top} -layers {M5 M6}