Fix 1-way single bank LVS bug. Full SRAM still not functional. 8-way has DRC error.

compiler/bank.py

@@ -39,13 +39,15 @@ class bank(design.design):
         self.num_banks = num_banks
 
         self.compute_sizes()
-        self.add_pins()
+	self.add_pins()
         self.create_modules()
         self.add_modules()
-        
         self.setup_layout_constraints()
-
         self.route_layout()
+
+        # Can remove the following, but it helps for debug!
+        self.add_lvs_correspondence_points() 
+        
         self.DRC_LVS()
 
     def add_pins(self):
@@ -56,18 +58,15 @@ class bank(design.design):
             self.add_pin("ADDR[{0}]".format(i))
 
         # For more than one bank, we have a bank select and name
-        # the signals gated_*
+        # the signals gated_*.
         if(self.num_banks > 1):
             self.add_pin("bank_select")
-            prefix = "gated_"
-        else:
-            prefix = ""
-        self.add_pin(prefix+"s_en")
-        self.add_pin(prefix+"w_en")
-        self.add_pin(prefix+"tri_en_bar")
-        self.add_pin(prefix+"tri_en")
-        self.add_pin(prefix+"clk_bar")
-        self.add_pin(prefix+"clk")
+        self.add_pin("s_en")
+        self.add_pin("w_en")
+        self.add_pin("tri_en_bar")
+        self.add_pin("tri_en")
+        self.add_pin("clk_bar")
+        self.add_pin("clk")
         self.add_pin("vdd")
         self.add_pin("gnd")
 
@@ -83,10 +82,10 @@ class bank(design.design):
         self.route_msf_address()
         self.route_control_lines()
         self.add_control_pins()
+        if self.num_banks > 1:
+            self.route_bank_select()
         self.route_vdd_supply()
         self.route_gnd_supply()
-        # Can remove the following, but it helps for debug!
-        self.add_lvs_correspondence_points() 
 
         #self.offset_all_coordinates()
 
@@ -110,7 +109,6 @@ class bank(design.design):
         self.add_row_decoder()
         self.add_wordline_driver()
         self.add_msf_address()
-        
         if(self.num_banks > 1):
             self.add_bank_select()
 
@@ -134,7 +132,9 @@ class bank(design.design):
         # Number of control lines in the bus
         self.num_control_lines = 6
         # The order of the control signals on the control bus:
-        self.control_lines = ["clk", "tri_en_bar", "tri_en", "clk_bar", "w_en", "s_en"]
+        self.control_signals = ["clk", "tri_en_bar", "tri_en", "clk_bar", "w_en", "s_en"]
+        if self.num_banks>1:
+            self.control_signals = ["gated_"+str for str in self.control_signals]
         # The central bus is the column address (both polarities), row address
         if self.col_addr_size>0:
             self.num_addr_lines = 2**self.col_addr_size + self.row_addr_size
@@ -159,18 +159,6 @@ class bank(design.design):
         self.overall_central_bus_width = self.m2_pitch * (self.num_control_lines + self.num_addr_lines + 5) + self.gnd_rail_width
 
 
-        # Array for control lines
-        self.control_signals = ["s_en",
-                                "w_en",
-                                "clk_bar",
-                                "tri_en",
-                                "tri_en_bar",
-                                "clk"]
-        self.gated_control_signals = ["gated_s_en",
-                                      "gated_w_en",
-                                      "gated_clk_bar",
-                                      "gated_tri_en", "gated_tri_en_bar",
-                                      "gated_clk"]
 
 
 
@@ -344,6 +332,7 @@ class bank(design.design):
         temp = []
         for i in range(self.word_size):
             temp.append("DATA[{0}]".format(i))
+        for i in range(self.word_size):
             temp.append("data_in[{0}]".format(i))
             temp.append("data_in_bar[{0}]".format(i))
         temp.extend(["clk_bar", "vdd", "gnd"])
@@ -484,10 +473,9 @@ class bank(design.design):
         NOR+INV gates to gate the control signals in case of multiple
         banks are created in upper level SRAM module
         """
-        assert 0
-        xoffset_nor = - self.start_of_left_central_bus - self.nor2.width - self.inv4x.width
+        xoffset_nor = self.start_of_left_central_bus + self.nor2.width + self.inv4x.width
         xoffset_inv = xoffset_nor + self.nor2.width
-        self.bank_select_or_position = vector(xoffset_nor, self.min_point)
+        self.bank_select_or_position = vector(-xoffset_nor, self.min_point)
 
         # bank select inverter
         self.bank_select_inv_position = vector(self.bank_select_or_position.x
@@ -636,7 +624,6 @@ class bank(design.design):
     def create_central_bus(self):
         """ Create the address, supply, and control signal central bus lines. """
 
-            
         # Address lines in central line connection are 2*col_addr_size 
         # number of connections for the column mux (for both signal and _bar) and row_addr_size (no _bar) 
 
@@ -645,7 +632,7 @@ class bank(design.design):
         # Control lines (to the right of the GND rail)
         for i in range(self.num_control_lines):
             x_offset = self.start_of_right_central_bus + i * self.m2_pitch
-            self.central_line_xoffset[self.control_lines[i]]=x_offset
+            self.central_line_xoffset[self.control_signals[i]]=x_offset
             # Pins are added later if this is a single bank, so just add rectangle now
             self.add_rect(layer="metal2",  
                           offset=vector(x_offset, self.min_point), 
@@ -1032,12 +1019,16 @@ class bank(design.design):
         # Connection from the central bus to the main control block crosses
         # pre-decoder and this connection is in metal3
         connection = []
-        connection.append(("clk_bar", self.msf_data_in_inst.get_pin("clk").lc()))
-        connection.append(("tri_en_bar", self.tri_gate_array_inst.get_pin("en_bar").lc()))
-        connection.append(("tri_en", self.tri_gate_array_inst.get_pin("en").lc()))
-        connection.append(("clk_bar", self.precharge_array_inst.get_pin("clk").lc()))
-        connection.append(("w_en", self.write_driver_array_inst.get_pin("wen").lc()))
-        connection.append(("s_en", self.sense_amp_array_inst.get_pin("sclk").lc()))
+        if self.num_banks>1:
+            prefix="gated_"
+        else:
+            prefix=""
+        connection.append((prefix+"clk_bar", self.msf_data_in_inst.get_pin("clk").lc()))
+        connection.append((prefix+"tri_en_bar", self.tri_gate_array_inst.get_pin("en_bar").lc()))
+        connection.append((prefix+"tri_en", self.tri_gate_array_inst.get_pin("en").lc()))
+        connection.append((prefix+"clk_bar", self.precharge_array_inst.get_pin("en").lc()))
+        connection.append((prefix+"w_en", self.write_driver_array_inst.get_pin("en").lc()))
+        connection.append((prefix+"s_en", self.sense_amp_array_inst.get_pin("en").lc()))
   
         for (control_signal, pin_position) in connection:
             control_x_offset = self.central_line_xoffset[control_signal] + self.m2_width
@@ -1049,7 +1040,7 @@ class bank(design.design):
                          rotate=90)
 
         # clk to msf address
-        control_signal = "clk"
+        control_signal = prefix+"clk"
         pin_position = self.msf_address_inst.get_pin("clk").uc()
         mid_position = pin_position + vector(0,self.m1_pitch)
         control_x_offset = self.central_line_xoffset[control_signal]
@@ -1060,7 +1051,7 @@ class bank(design.design):
                      offset=control_via_position)
 
         # clk to wordline_driver
-        control_signal = "clk"
+        control_signal = prefix+"clk"
         pin_position = self.wordline_driver_inst.get_pin("en").uc()
         mid_position = pin_position + vector(0,self.m1_pitch)
         control_x_offset = self.central_line_xoffset[control_signal]
@@ -1072,9 +1063,10 @@ class bank(design.design):
         
 
 
-    def route_bank_select_or2_gates(self):
+    def route_bank_select(self):
         """ Route array of or gates to gate the control signals in case 
             of multiple banks are created in upper level SRAM module """
+        return
         bank_select_line_xoffset = (self.bank_select_or_position.x 
                                         - 3*drc["minwidth_metal2"])
         self.add_rect(layer="metal2", 
@@ -1231,6 +1223,7 @@ class bank(design.design):
         
         # Connect bank_select_or2_array gnd
         if(self.num_banks > 1):
+            return
             self.bank_select_inv_position
             self.add_rect(layer="metal1", 
                           offset=(self.bank_select_inv_position
@@ -1263,21 +1256,14 @@ class bank(design.design):
     def add_control_pins(self):
         """ Add the control signal input pins """
 
-        if self.num_banks==1:
-            # If we are a single bank, just add duplicate pin shapes
-            # on the existing the control bus
-            for ctrl in self.control_signals:
-                x_offset = self.central_line_xoffset[ctrl]
-                self.add_layout_pin(text=ctrl,
-                                    layer="metal2",  
-                                    offset=vector(x_offset, self.min_point), 
-                                    width=self.m2_width, 
-                                    height=self.height)
-        else:
-            # If we are gating the signals, they must be the inputs to the gating logic
-            # Then route the outputs to the control bus
-            self.route_bank_select_or2_gates()
-            pass
+        for ctrl in self.control_signals:
+            x_offset = self.central_line_xoffset[ctrl]
+            self.add_layout_pin(text=ctrl,
+                                layer="metal2",  
+                                offset=vector(x_offset, self.min_point), 
+                                width=self.m2_width, 
+                                height=self.height)
+
 
     def connect_rail_from_right(self,inst, pin, rail):
         """ Helper routine to connect an unrotated/mirrored oriented instance to the rails """

compiler/ms_flop_array.py

@@ -40,6 +40,7 @@ class ms_flop_array(design.design):
     def add_pins(self):
         for i in range(self.word_size):
             self.add_pin("din[{0}]".format(i))
+        for i in range(self.word_size):
             self.add_pin("dout[{0}]".format(i))
             self.add_pin("dout_bar[{0}]".format(i))
         self.add_pin("clk")

compiler/precharge_array.py

@@ -36,7 +36,7 @@ class precharge_array(design.design):
         for i in range(self.columns):
             self.add_pin("bl[{0}]".format(i))
             self.add_pin("br[{0}]".format(i))
-        self.add_pin("clk")
+        self.add_pin("en")
         self.add_pin("vdd")
 
     def create_layout(self):
@@ -48,7 +48,7 @@ class precharge_array(design.design):
                             width=self.width,
                             height=drc["minwidth_metal1"])
         
-        self.add_layout_pin(text="clk",
+        self.add_layout_pin(text="en",
                             layer="metal1",
                             offset=self.pc_cell.get_pin("clk").ll(),
                             width=self.width,
@@ -77,5 +77,5 @@ class precharge_array(design.design):
                                 width=drc["minwidth_metal2"],
                                 height=bl_pin.height())
             self.connect_inst(["bl[{0}]".format(i), "br[{0}]".format(i),
-                               "clk", "vdd"])
+                               "en", "vdd"])
 

compiler/sense_amp_array.py

@@ -37,7 +37,7 @@ class sense_amp_array(design.design):
             self.add_pin("bl[{0}]".format(i))
             self.add_pin("br[{0}]".format(i))
 
-        self.add_pin("sclk")
+        self.add_pin("en")
         self.add_pin("vdd")
         self.add_pin("gnd")
 
@@ -69,7 +69,7 @@ class sense_amp_array(design.design):
                           offset=amp_position)
             self.connect_inst(["bl[{0}]".format(i),"br[{0}]".format(i), 
                                "data[{0}]".format(i/self.words_per_row), 
-                               "sclk", "vdd", "gnd"])
+                               "en", "vdd", "gnd"])
 
             self.add_layout_pin(text="bl[{0}]".format(i),
                                 layer="metal2",
@@ -111,7 +111,7 @@ class sense_amp_array(design.design):
 
         # add sclk rail across entire array
         sclk_offset = self.amp.get_pin("SCLK").ll().scale(0,1)
-        self.add_layout_pin(text="sclk",
+        self.add_layout_pin(text="en",
                       layer="metal1",
                       offset=sclk_offset,
                       width=self.width,

compiler/tests/19_four_bank_test.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python2.7
+"""
+Run a regresion test on various srams
+"""
+
+import unittest
+from testutils import header
+import sys,os
+sys.path.append(os.path.join(sys.path[0],".."))
+import globals
+import debug
+import calibre
+
+OPTS = globals.get_opts()
+
+
+
+class bank_test(unittest.TestCase):
+
+    def runTest(self):
+        globals.init_openram("config_20_{0}".format(OPTS.tech_name))
+        # we will manually run lvs/drc
+        OPTS.check_lvsdrc = False
+
+        import bank
+
+        debug.info(1, "No column mux")
+        a = bank.bank(word_size=4, num_words=16, words_per_row=1, num_banks=4, name="test_sram1")
+        self.local_check(a)
+
+        debug.info(1, "Two way column mux")
+        a = bank.bank(word_size=4, num_words=32, words_per_row=2, num_banks=4, name="test_sram2")
+        self.local_check(a)
+
+        debug.info(1, "Four way column mux")
+        a = bank.bank(word_size=4, num_words=64, words_per_row=4, num_banks=4, name="test_sram3")
+        self.local_check(a)
+
+        # Eight way has a short circuit of one column mux select to gnd rail
+        # debug.info(1, "Eight way column mux")
+        # a = bank.bank(word_size=2, num_words=128, words_per_row=8, num_banks=2, name="test_sram4")
+        # self.local_check(a)
+        
+        OPTS.check_lvsdrc = True
+        globals.end_openram()
+        
+    def local_check(self, a):
+        tempspice = OPTS.openram_temp + "temp.sp"
+        tempgds = OPTS.openram_temp + "temp.gds"
+
+        a.sp_write(tempspice)
+        a.gds_write(tempgds)
+
+        self.assertFalse(calibre.run_drc(a.name, tempgds))
+        self.assertFalse(calibre.run_lvs(a.name, tempgds, tempspice))
+
+        os.remove(tempspice)
+        os.remove(tempgds)
+
+        # reset the static duplicate name checker for unit tests
+        import design
+        design.design.name_map=[]
+        
+# instantiate a copy of the class to actually run the test
+if __name__ == "__main__":
+    (OPTS, args) = globals.parse_args()
+    del sys.argv[1:]
+    header(__file__, OPTS.tech_name)
+    unittest.main()

compiler/tests/19_two_bank_test.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python2.7
+"""
+Run a regresion test on various srams
+"""
+
+import unittest
+from testutils import header
+import sys,os
+sys.path.append(os.path.join(sys.path[0],".."))
+import globals
+import debug
+import calibre
+
+OPTS = globals.get_opts()
+
+
+
+class bank_test(unittest.TestCase):
+
+    def runTest(self):
+        globals.init_openram("config_20_{0}".format(OPTS.tech_name))
+        # we will manually run lvs/drc
+        OPTS.check_lvsdrc = False
+
+        import bank
+
+        debug.info(1, "No column mux")
+        a = bank.bank(word_size=4, num_words=16, words_per_row=1, num_banks=2, name="test_sram1")
+        self.local_check(a)
+
+        debug.info(1, "Two way column mux")
+        a = bank.bank(word_size=4, num_words=32, words_per_row=2, num_banks=2, name="test_sram2")
+        self.local_check(a)
+
+        debug.info(1, "Four way column mux")
+        a = bank.bank(word_size=4, num_words=64, words_per_row=4, num_banks=2, name="test_sram3")
+        self.local_check(a)
+
+        # Eight way has a short circuit of one column mux select to gnd rail
+        # debug.info(1, "Eight way column mux")
+        # a = bank.bank(word_size=2, num_words=128, words_per_row=8, num_banks=2, name="test_sram4")
+        # self.local_check(a)
+        
+        OPTS.check_lvsdrc = True
+        globals.end_openram()
+        
+    def local_check(self, a):
+        tempspice = OPTS.openram_temp + "temp.sp"
+        tempgds = OPTS.openram_temp + "temp.gds"
+
+        a.sp_write(tempspice)
+        a.gds_write(tempgds)
+
+        self.assertFalse(calibre.run_drc(a.name, tempgds))
+        self.assertFalse(calibre.run_lvs(a.name, tempgds, tempspice))
+
+        os.remove(tempspice)
+        os.remove(tempgds)
+
+        # reset the static duplicate name checker for unit tests
+        import design
+        design.design.name_map=[]
+        
+# instantiate a copy of the class to actually run the test
+if __name__ == "__main__":
+    (OPTS, args) = globals.parse_args()
+    del sys.argv[1:]
+    header(__file__, OPTS.tech_name)
+    unittest.main()

compiler/tri_gate_array.py

@@ -49,16 +49,10 @@ class tri_gate_array(design.design):
         self.tri_inst = {}
         for i in range(0,self.columns,self.words_per_row):
             name = "Xtri_gate{0}".format(i)
-            if (i % 2 == 0 or self.words_per_row > 1):
-                base = vector(i*self.tri.width, 0)
-                mirror = "R0"
-            else:
-                base = vector((i+1)*self.tri.width, 0)
-                mirror = "MY"
+            base = vector(i*self.tri.width, 0)
             self.tri_inst[i]=self.add_inst(name=name,
                                            mod=self.tri,
-                                           offset=base,
-                                           mirror=mirror)
+                                           offset=base)
             self.connect_inst(["in[{0}]".format(i/self.words_per_row),
                                "out[{0}]".format(i/self.words_per_row),
                                "en", "en_bar", "vdd", "gnd"])
@@ -68,15 +62,6 @@ class tri_gate_array(design.design):
         
         for i in range(0,self.columns,self.words_per_row):
 
-            # Avoid duplicate pins by only doing even columns
-            for gnd_pin in self.tri_inst[i].get_pins("gnd"):
-                if i%2 == 0 and gnd_pin.layer=="metal2":
-                    self.add_layout_pin(text="gnd",
-                                        layer="metal2",
-                                        offset=gnd_pin.ll(),
-                                        width=gnd_pin.width(),
-                                        height=gnd_pin.height())
-
             in_pin = self.tri_inst[i].get_pin("in")
             self.add_layout_pin(text="in[{0}]".format(i/self.words_per_row),
                                 layer="metal2",

compiler/write_driver_array.py

@@ -37,7 +37,7 @@ class write_driver_array(design.design):
         for i in range(self.word_size):            
             self.add_pin("bl_out[{0}]".format(i))
             self.add_pin("br_out[{0}]".format(i))
-        self.add_pin("wen")
+        self.add_pin("en")
         self.add_pin("vdd")
         self.add_pin("gnd")
 
@@ -50,21 +50,16 @@ class write_driver_array(design.design):
         self.driver_insts = {}
         for i in range(0,self.columns,self.words_per_row):
             name = "Xwrite_driver{}".format(i)
-            if (i % 2 == 0 or self.words_per_row>1):
-                base = vector(i * self.driver.width,0)
-                mirror = "R0"
-            else:
-                base = vector((i+1) * self.driver.width,0)
-                mirror = "MY"
+            base = vector(i * self.driver.width,0)
             
             self.driver_insts[i/self.words_per_row]=self.add_inst(name=name,
                                                                   mod=self.driver,
-                                                                  offset=base,
-                                                                  mirror=mirror)
+                                                                  offset=base)
+
             self.connect_inst(["data[{0}]".format(i/self.words_per_row),
                                "bl_out[{0}]".format(i/self.words_per_row),
                                "br_out[{0}]".format(i/self.words_per_row),
-                               "wen", "vdd", "gnd"])
+                               "en", "vdd", "gnd"])
 
 
     def add_layout_pins(self):
@@ -90,7 +85,7 @@ class write_driver_array(design.design):
                                 height=br_pin.height())
                            
 
-        self.add_layout_pin(text="wen",
+        self.add_layout_pin(text="en",
                             layer="metal1",
                             offset=self.driver_insts[0].get_pin("en").ll().scale(0,1),
                             width=self.width,