basic nmos array, for nand rom

compiler/modules/rom_base_array.py

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+# 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.
+#
+
+
+
+from .bitcell_base_array import bitcell_base_array
+from base import vector
+from globals import OPTS
+from sram_factory import factory
+
+class rom_base_array(bitcell_base_array):
+
+    def __init__(self, rows, cols, bitmap, name="", column_offset=0):
+        super().__init__(name=name, rows=rows, cols=cols, column_offset=column_offset)
+        self.data = bitmap
+
+        self.create_all_bitline_names()
+        self.create_all_wordline_names()
+        self.create_netlist()
+
+        self.create_layout()
+        
+
+    def create_netlist(self):
+        self.add_modules()
+        self.add_pins()
+        self.create_instances()
+
+
+    def create_layout(self):
+        #self.add_layout_pins()
+        self.place_ptx()
+        self.route_supplies()
+
+        #self.add_boundary()
+
+        #self.DRC_LVS()
+        
+    #def add_pins(self):
+    def add_boundary(self):
+        self.width = self.nmos.width * self.column_size
+        self.height = self.nmos.height * self.row_size
+        super().add_boundary()
+
+    def add_modules(self):
+
+        self.nmos = factory.create(module_type="ptx", tx_type="nmos")
+    
+
+
+    def create_instances(self):
+        self.cell_inst = {}
+        self.current_row = 0
+        for col in range(self.column_size):
+            for row in range(self.row_size):
+                name = "bit_r{0}_c{1}".format(row, col)
+
+                if(self.data[col][row] == 1):
+                    self.cell_inst[row, col]=self.add_inst(name=name,
+                                                       mod=self.nmos)
+                    
+                    self.connect_inst(self.get_bitcell_pins(row, col))
+
+                # If it is a "core" cell, it could be trimmed for sim time
+                #if col>0 and col<self.column_size-1 and row>0 and row<self.row_size-1:
+                #    self.trim_insts.add(name)
+
+    def place_ptx(self):
+        self.cell_pos = {}
+        for col in range(self.column_size):
+            for row in range(self.row_size):
+                
+
+                if(self.data[col][row] == 1):
+
+                    cell_x = (self.nmos.width + 2 * self.nmos.active_contact_to_gate + self.nmos.contact_width) * col 
+                    cell_y = (self.nmos.height + self.nmos.poly_extend_active)  * row
+                    self.cell_pos[row, col] = self.nmos.active_offset.scale(1, 0) \
+                        + vector(cell_x, cell_y)
+                    
+                    self.cell_inst[row, col].place(self.cell_pos[row, col])
+
+
+
+
+    def create_all_bitline_names(self):
+        for col in range(self.column_size):
+            for port in self.all_ports:
+                self.bitline_names[port].extend(["bl_{0}_{1}".format(port, col)])
+        # Make a flat list too
+        self.all_bitline_names = [x for sl in zip(*self.bitline_names) for x in sl]
+
+
+    def get_bitcell_pins(self, row, col):
+        bitcell_pins = []
+
+        #drain pin
+        if self.current_row == 0:
+            bitcell_pins.append(self.bitline_names[0][col])
+        else:
+            bitcell_pins.append(self.get_current_bl_interconnect(col))
+            
+
+        #gate pin
+        bitcell_pins.append(self.get_wordline_names()[row])
+
+        #source pin
+        
+
+        if 1 not in self.data[col][row + 1:]:
+            bitcell_pins.append("gnd")
+        else:
+            bitcell_pins.append(self.create_next_bl_interconnect(row, col))
+        #body pin
+        bitcell_pins.append("gnd")
+
+        return bitcell_pins
+
+    def create_next_bl_interconnect(self, row, col):
+        self.current_row = row
+        return "bli_{0}_{1}".format(row, col)
+
+    def get_current_bl_interconnect(self, col):
+        return "bli_{0}_{1}".format(self.current_row, col)
+
+

compiler/tests/05_rom_array_test.py

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+#!/usr/bin/env python3
+# 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 unittest
+from testutils import *
+import sys, os
+
+import globals
+from globals import OPTS
+from sram_factory import factory
+import debug
+
+
+class rom_array_test(openram_test):
+
+    def runTest(self):
+        config_file = "{}/tests/configs/config".format(os.getenv("OPENRAM_HOME"))
+        globals.init_openram(config_file)
+
+        debug.info(2, "Testing 4x4 array for rom cell")
+
+        data = [[1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1]]
+
+        a = factory.create(module_type="rom_base_array", cols=4, rows=4, bitmap=data)
+        self.local_check(a)
+
+        globals.end_openram()
+
+# run the test from the command line
+if __name__ == "__main__":
+    (OPTS, args) = globals.parse_args()
+    del sys.argv[1:]
+    header(__file__, OPTS.tech_name)
+    unittest.main(testRunner=debugTestRunner())