# See LICENSE for licensing information. # # Copyright (c) 2016-2021 Regents of the University of California and The Board # of Regents for the Oklahoma Agricultural and Mechanical College # (acting for and on behalf of Oklahoma State University) # All rights reserved. # import debug from tech import layer_names import os import shutil from globals import OPTS class lef: """ SRAM LEF Class open GDS file, read pins information, obstruction and write them to LEF file. This is inherited by the sram_base class. """ def __init__(self, layers): # LEF db units per micron self.lef_units = 2000 # These are the layers of the obstructions self.lef_layers = layers # Round to ensure float values are divisible by 0.0025 (the manufacturing grid) self.round_grid = 4 def magic_lef_write(self, lef_name): """ Use a magic script to perform LEF creation. """ debug.info(3, "Writing abstracted LEF to {0}".format(lef_name)) # Copy .magicrc file into the output directory magic_file = OPTS.openram_tech + "tech/.magicrc" if os.path.exists(magic_file): shutil.copy(magic_file, OPTS.openram_temp) else: debug.warning("Could not locate .magicrc file: {}".format(magic_file)) gds_name = OPTS.openram_temp + "{}.gds".format(self.name) self.gds_write(gds_name) run_file = OPTS.openram_temp + "run_lef.sh" f = open(run_file, "w") f.write("#!/bin/sh\n") f.write('export OPENRAM_TECH="{}"\n'.format(os.environ['OPENRAM_TECH'])) f.write('echo "$(date): Starting GDS to MAG using Magic {}"\n'.format(OPTS.drc_exe[1])) f.write('\n') f.write("{} -dnull -noconsole << EOF\n".format(OPTS.drc_exe[1])) f.write("drc off\n") f.write("gds polygon subcell true\n") f.write("gds warning default\n") f.write("gds flatten true\n") f.write("gds ordering true\n") f.write("gds readonly true\n") f.write("gds read {}\n".format(gds_name)) f.write('puts "Finished reading gds {}"\n'.format(gds_name)) f.write("load {}\n".format(self.name)) f.write('puts "Finished loading cell {}"\n'.format(self.name)) f.write("cellname delete \\(UNNAMED\\)\n") f.write("lef write {} -hide\n".format(lef_name)) f.write('puts "Finished writing LEF cell {}"\n'.format(self.name)) f.close() os.system("chmod u+x {}".format(run_file)) from run_script import run_script (outfile, errfile, resultsfile) = run_script(self.name, "lef") def lef_write(self, lef_name): """ Write the entire lef of the object to the file. """ if OPTS.drc_exe[0] == "magic": self.magic_lef_write(lef_name) return debug.info(3, "Writing detailed LEF to {0}".format(lef_name)) self.indent = "" # To maintain the indent level easily self.lef = open(lef_name, "w") self.lef_write_header() for pin in self.pins: self.lef_write_pin(pin) self.lef_write_obstructions() self.lef_write_footer() self.lef.close() def lef_write_header(self): """ Header of LEF file """ self.lef.write("VERSION 5.4 ;\n") self.lef.write("NAMESCASESENSITIVE ON ;\n") self.lef.write("BUSBITCHARS \"[]\" ;\n") self.lef.write("DIVIDERCHAR \"/\" ;\n") self.lef.write("UNITS\n") self.lef.write(" DATABASE MICRONS {0} ;\n".format(self.lef_units)) self.lef.write("END UNITS\n") self.lef.write("{0}MACRO {1}\n".format(self.indent, self.name)) self.indent += " " self.lef.write("{0}CLASS BLOCK ;\n".format(self.indent)) self.lef.write("{0}SIZE {1} BY {2} ;\n" .format(self.indent, round(self.width, self.round_grid), round(self.height, self.round_grid))) self.lef.write("{0}SYMMETRY X Y R90 ;\n".format(self.indent)) def lef_write_footer(self): self.lef.write("{0}END {1}\n".format(self.indent, self.name)) self.indent = self.indent[:-3] self.lef.write("END LIBRARY\n") def lef_write_pin(self, name): pin_dir = self.get_pin_dir(name) pin_type = self.get_pin_type(name) self.lef.write("{0}PIN {1}\n".format(self.indent, name)) self.indent += " " self.lef.write("{0}DIRECTION {1} ;\n".format(self.indent, pin_dir)) if pin_type in ["POWER", "GROUND"]: self.lef.write("{0}USE {1} ; \n".format(self.indent, pin_type)) self.lef.write("{0}SHAPE ABUTMENT ; \n".format(self.indent)) self.lef.write("{0}PORT\n".format(self.indent)) self.indent += " " # We could sort these together to minimize different layer sections, but meh. pin_list = self.get_pins(name) for pin in pin_list: self.lef.write("{0}LAYER {1} ;\n".format(self.indent, layer_names[pin.layer])) self.lef_write_shape(pin.rect) # End the PORT self.indent = self.indent[:-3] self.lef.write("{0}END\n".format(self.indent)) # End the PIN self.indent = self.indent[:-3] self.lef.write("{0}END {1}\n".format(self.indent, name)) def lef_write_obstructions(self): """ Write all the obstructions on each layer """ self.lef.write("{0}OBS\n".format(self.indent)) for layer in self.lef_layers: self.lef.write("{0}LAYER {1} ;\n".format(self.indent, layer_names[layer])) self.indent += " " blockages = self.get_blockages(layer, True) for b in blockages: self.lef_write_shape(b) self.indent = self.indent[:-3] self.lef.write("{0}END\n".format(self.indent)) def lef_write_shape(self, rect): if len(rect) == 2: """ Write a LEF rectangle """ self.lef.write("{0}RECT ".format(self.indent)) for item in rect: # print(rect) self.lef.write(" {0} {1}".format(round(item[0], self.round_grid), round(item[1], self.round_grid))) self.lef.write(" ;\n") else: """ Write a LEF polygon """ self.lef.write("{0}POLYGON ".format(self.indent)) for item in rect: self.lef.write(" {0} {1}".format(round(item[0], self.round_grid), round(item[1], self.round_grid))) # for i in range(0,len(rect)): # self.lef.write(" {0} {1}".format(round(rect[i][0],self.round_grid), round(rect[i][1],self.round_grid))) self.lef.write(" ;\n")