removing references to nangate45 example

vlsi/Makefile

@@ -34,8 +34,7 @@ else
 endif
 
 ENV_YML            ?= $(vlsi_dir)/env.yml
-TECH_CONF          ?= $(if $(filter $(tech_name),nangate45), 	example-nangate45.yml,\
-                      $(if $(filter $(tech_name),asap7),        example-asap7.yml,\
+TECH_CONF          ?= $(if $(filter $(tech_name),asap7),        example-asap7.yml,\
                                                                 example-sky130.yml))
 TOOLS_CONF         ?= example-tools.yml
 INPUT_CONFS        ?= $(TOOLS_CONF) $(TECH_CONF)

vlsi/example-nangate45.yml

@@ -1,73 +0,0 @@
-#----------------------
-# Technology Setup
-#----------------------
-
-vlsi.core.technology: nangate45
-
-# the nangate45.tech.json can't reference the $OPENROAD environment variable,
-# so we need to set the install dir here. 
-# TODO: figure out how to remove this, or override it within OpenROADTool
-technology.nangate45.install_dir: "/k/work/OpenROAD-flow/tools/OpenROAD"
-
-vlsi.core.max_threads: 12
-
-#----------------------
-# General Hammer Inputs
-#----------------------
-
-# Hammer will auto-generate a CPF for simple power designs; 
-# see hammer/src/hammer-vlsi/defaults.yml for more info
-vlsi.inputs.power_spec_mode: "auto"
-vlsi.inputs.power_spec_type: "cpf"
-
-# Specify clock signals
-vlsi.inputs.clocks: [
-  {name: "clock_clock", period: "5ns", uncertainty: "0.5ns"}
-]
-
-# Generate Make include to aid in flow 
-vlsi.core.build_system: make
-
-#----------------------
-# Placement Constraints
-#----------------------
-
-# For nangate45, size should be multiple of (0.19,1.4) placement grid
-vlsi.inputs.placement_constraints:
-  - path: "ChipTop"
-    type: toplevel
-    x: 0
-    y: 0
-    width: 3334.72
-    height: 3798.2
-    margins: 
-      left: 0
-      right: 0
-      top: 0
-      bottom: 0
-
-# SRAM Compiler compiler options
-vlsi.core.sram_generator_tool: "sram_compiler"
-## You should specify a location for the SRAM generator in the tech plugin
-vlsi.core.sram_generator_tool_path: [
-  "hammer/src/hammer-vlsi/technology/nangate45"]
-vlsi.core.sram_generator_tool_path_meta: "append"
-
-#----------------------
-# Tool options. Replace with your tool plugin of choice.
-#----------------------
-
-# OpenROAD-yosys options
-vlsi.core.synthesis_tool: "yosys"
-vlsi.core.synthesis_tool_path: ["hammer/src/hammer-vlsi/synthesis/yosys"]
-vlsi.core.synthesis_tool_path_meta: "append"
-
-# OpenROAD-par options
-vlsi.core.par_tool: "openroad"
-vlsi.core.par_tool_path: ["hammer/src/hammer-vlsi/par"]
-vlsi.core.par_tool_path_meta: "append"
-
-# OpenROAD-drc options (no lvs)
-vlsi.core.drc_tool: "openroad"
-vlsi.core.drc_tool_path: ["hammer/src/hammer-vlsi/drc"]
-vlsi.core.drc_tool_path_meta: "append"