Adding script for Power Distribution Network. Taken from Professor's repo

openlane/openram_testchip/pdn.tcl

diff --git a/openlane/openram_testchip/pdn.tcl b/openlane/openram_testchip/pdn.tcl
new file mode 100644
index 0000000..4ce71c4
--- /dev/null
+++ b/openlane/openram_testchip/pdn.tcl
@@ -0,0 +1,34 @@
+# Power nets

+set ::power_nets $::env(VDD_PIN)

+set ::ground_nets $::env(GND_PIN)

+

+set ::macro_blockage_layer_list "li1 met1 met2 met3 met4 met5"

+

+pdngen::specify_grid stdcell {

+    name grid

+    rails {

+	    met1 {width 0.48 pitch $::env(PLACE_SITE_HEIGHT) offset 0}

+    }

+    straps {

+	    met4 {width 1.6 pitch $::env(FP_PDN_VPITCH) offset $::env(FP_PDN_VOFFSET)}

+	    met5 {width 1.6 pitch $::env(FP_PDN_HPITCH) offset $::env(FP_PDN_HOFFSET)}

+    }

+    connect {{met1 met4} {met4 met5}}

+}

+

+pdngen::specify_grid macro {

+    power_pins "VPWR VDD vdd"

+    ground_pins "VGND VSS gnd"

+    blockages "li1 met1 met2 met3 met4"

+    straps { 

+    } 

+    connect {{met4_PIN_ver met5} {met3_PIN_hor met5}}

+}

+

+set ::halo $::env(FP_HORIZONTAL_HALO)

+

+# POWER or GROUND #Std. cell rails starting with power or ground rails at the bottom of the core area

+set ::rails_start_with "POWER" ;

+

+# POWER or GROUND #Upper metal stripes starting with power or ground rails at the left/bottom of the core area

+set ::stripes_start_with "POWER" ;
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