mirror of https://github.com/VLSIDA/OpenRAM.git
130 lines
4.9 KiB
Python
130 lines
4.9 KiB
Python
# See LICENSE for licensing information.
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#
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# Copyright (c) 2016-2019 Regents of the University of California and The Board
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# of Regents for the Oklahoma Agricultural and Mechanical College
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# (acting for and on behalf of Oklahoma State University)
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# All rights reserved.
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#
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import gdsMill
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import tech
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import globals
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import math
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import debug
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import datetime
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from collections import defaultdict
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import pdb
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class lef:
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"""
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SRAM LEF Class open GDS file, read pins information, obstruction
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and write them to LEF file.
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This is inherited by the sram_base class.
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"""
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def __init__(self,layers):
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# LEF db units per micron
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self.lef_units = 2000
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# These are the layers of the obstructions
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self.lef_layers = layers
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# Round to ensure float values are divisible by 0.0025 (the manufacturing grid)
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self.round_grid = 4;
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def lef_write(self, lef_name):
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"""Write the entire lef of the object to the file."""
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debug.info(3, "Writing to {0}".format(lef_name))
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self.indent = "" # To maintain the indent level easily
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self.lef = open(lef_name,"w")
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self.lef_write_header()
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for pin in self.pins:
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self.lef_write_pin(pin)
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self.lef_write_obstructions()
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self.lef_write_footer()
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self.lef.close()
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def lef_write_header(self):
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""" Header of LEF file """
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self.lef.write("VERSION 5.4 ;\n")
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self.lef.write("NAMESCASESENSITIVE ON ;\n")
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self.lef.write("BUSBITCHARS \"[]\" ;\n")
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self.lef.write("DIVIDERCHAR \"/\" ;\n")
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self.lef.write("UNITS\n")
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self.lef.write(" DATABASE MICRONS {0} ;\n".format(self.lef_units))
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self.lef.write("END UNITS\n")
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self.lef.write("{0}MACRO {1}\n".format(self.indent,self.name))
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self.indent += " "
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self.lef.write("{0}CLASS BLOCK ;\n".format(self.indent))
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self.lef.write("{0}SIZE {1} BY {2} ;\n" .format(self.indent,
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round(self.width,self.round_grid),
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round(self.height,self.round_grid)))
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self.lef.write("{0}SYMMETRY X Y R90 ;\n".format(self.indent))
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def lef_write_footer(self):
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self.lef.write("{0}END {1}\n".format(self.indent,self.name))
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self.indent = self.indent[:-3]
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self.lef.write("END LIBRARY\n")
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def lef_write_pin(self, name):
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pin_dir = self.get_pin_dir(name)
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pin_type = self.get_pin_type(name)
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self.lef.write("{0}PIN {1}\n".format(self.indent,name))
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self.indent += " "
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self.lef.write("{0}DIRECTION {1} ;\n".format(self.indent,pin_dir))
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if pin_type in ["POWER","GROUND"]:
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self.lef.write("{0}USE {1} ; \n".format(self.indent,pin_type))
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self.lef.write("{0}SHAPE ABUTMENT ; \n".format(self.indent))
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self.lef.write("{0}PORT\n".format(self.indent))
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self.indent += " "
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# We could sort these together to minimize different layer sections, but meh.
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pin_list = self.get_pins(name)
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for pin in pin_list:
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self.lef.write("{0}LAYER {1} ;\n".format(self.indent,pin.layer))
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self.lef_write_shape(pin.rect)
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# End the PORT
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self.indent = self.indent[:-3]
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self.lef.write("{0}END\n".format(self.indent))
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# End the PIN
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self.indent = self.indent[:-3]
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self.lef.write("{0}END {1}\n".format(self.indent,name))
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def lef_write_obstructions(self):
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""" Write all the obstructions on each layer """
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self.lef.write("{0}OBS\n".format(self.indent))
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for layer in self.lef_layers:
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self.lef.write("{0}LAYER {1} ;\n".format(self.indent,layer))
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self.indent += " "
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# pdb.set_trace()
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blockages = self.get_blockages(layer,True)
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for b in blockages:
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# if len(b) > 2:
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# print(b)
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self.lef_write_shape(b)
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self.indent = self.indent[:-3]
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self.lef.write("{0}END\n".format(self.indent))
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def lef_write_shape(self, rect):
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if len(rect) == 2:
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""" Write a LEF rectangle """
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self.lef.write("{0}RECT ".format(self.indent))
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for item in rect:
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# print(rect)
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self.lef.write(" {0} {1}".format(round(item[0],self.round_grid), round(item[1],self.round_grid)))
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self.lef.write(" ;\n")
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else:
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""" Write a LEF polygon """
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self.lef.write("{0}POLYGON ".format(self.indent))
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for item in rect:
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self.lef.write(" {0} {1}".format(round(item[0],self.round_grid), round(item[1],self.round_grid)))
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# for i in range(0,len(rect)):
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# self.lef.write(" {0} {1}".format(round(rect[i][0],self.round_grid), round(rect[i][1],self.round_grid)))
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self.lef.write(" ;\n")
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