Add pand2 draft

compiler/pgates/pand2.py

@@ -0,0 +1,126 @@
+import debug
+import design
+from tech import drc
+from math import log
+from vector import vector
+from globals import OPTS
+from pnand2 import pnand2
+from pinv import pinv
+
+class pand2(design.design):
+    """
+    This is a simple buffer used for driving loads. 
+    """
+    from importlib import reload
+    c = reload(__import__(OPTS.bitcell))
+    bitcell = getattr(c, OPTS.bitcell)
+
+    unique_id = 1
+
+    def __init__(self, driver_size=4, height=bitcell.height, name=""):
+
+        stage_effort = 4
+        # FIXME: Change the number of stages to support high drives.
+
+        if name=="":
+            name = "pand2_{0}_{1}".format(driver_size, pand2.unique_id)
+            pand2.unique_id += 1
+
+        design.design.__init__(self, name)
+        debug.info(1, "Creating {}".format(self.name))
+
+        
+        # Shield the cap, but have at least a stage effort of 4
+        self.nand = pnand2(height=height) 
+        self.add_mod(self.nand)
+        
+        self.inv = pinv(size=driver_size, height=height)
+        self.add_mod(self.inv)
+
+        self.width = self.nand.width + self.inv.width
+        self.height = self.inv.height
+
+        self.create_layout()
+
+        #self.offset_all_coordinates()
+        
+        self.DRC_LVS()
+
+    def create_layout(self):
+        self.add_pins()
+        self.add_insts()
+        self.add_wires()
+        self.add_layout_pins()
+        
+    def add_pins(self):
+        self.add_pin("A")
+        self.add_pin("B")
+        self.add_pin("Z")
+        self.add_pin("vdd")
+        self.add_pin("gnd")
+
+    def add_insts(self):
+        # Add NAND to the right 
+        self.nand_inst=self.add_inst(name="pand2_nand",
+                                     mod=self.nand,
+                                     offset=vector(0,0))
+        self.connect_inst(["A", "B", "zb_int",  "vdd", "gnd"])
+        
+
+        # Add INV to the right
+        self.inv_inst=self.add_inst(name="pand2_inv",
+                                    mod=self.inv,
+                                    offset=vector(self.nand_inst.rx(),0))
+        self.connect_inst(["zb_int", "Z",  "vdd", "gnd"])
+        
+        
+    def add_wires(self):
+        # nand Z to inv A
+        z1_pin = self.nand_inst.get_pin("Z")
+        a2_pin = self.inv_inst.get_pin("A")
+        mid1_point = vector(0.5*(z1_pin.cx()+a2_pin.cx()), z1_pin.cy())
+        mid2_point = vector(mid1_point, a2_pin.cy())
+        self.add_path("metal1", [z1_pin.center(), mid1_point, mid2_point, a2_pin.center()])
+        
+        
+    def add_layout_pins(self):
+        # Continous vdd rail along with label.
+        vdd_pin=self.inv_inst.get_pin("vdd")
+        self.add_layout_pin(text="vdd",
+                            layer="metal1",
+                            offset=vdd_pin.ll().scale(0,1),
+                            width=self.width,
+                            height=vdd_pin.height())
+        
+        # Continous gnd rail along with label.
+        gnd_pin=self.inv_inst.get_pin("gnd")
+        self.add_layout_pin(text="gnd",
+                            layer="metal1",
+                            offset=gnd_pin.ll().scale(0,1),
+                            width=self.width,
+                            height=vdd_pin.height())
+            
+        z_pin = self.inv_inst.get_pin("Z")
+        self.add_layout_pin_rect_center(text="Z",
+                                        layer="metal2",
+                                        offset=z_pin.center())
+        self.add_via_center(layers=("metal1","via1","metal2"),
+                            offset=z_pin.center())
+
+        for pin_name in ["A","B"]:
+            pin = self.nand_inst.get_pin(pin_name)
+            self.add_layout_pin_rect_center(text=pin_name,
+                                            layer="metal2",
+                                            offset=pin.center())
+            self.add_via_center(layers=("metal1","via1","metal2"),
+                                offset=pin.center())
+        
+        
+
+    def analytical_delay(self, slew, load=0.0):
+        """ Calculate the analytical delay of DFF-> INV -> INV """
+        nand_delay = selfnand.analytical_delay(slew=slew, load=self.inv.input_load()) 
+        inv_delay = self.inv.analytical_delay(slew=nand_delay.slew, load=load)
+        return nand_delay + inv_delay
+    
+    

compiler/tests/04_pand2_test.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+"""
+Run a regression test on a pand2 cell
+"""
+
+import unittest
+from testutils import header,openram_test
+import sys,os
+sys.path.append(os.path.join(sys.path[0],".."))
+import globals
+from globals import OPTS
+import debug
+
+class pand2_test(openram_test):
+
+    def runTest(self):
+        globals.init_openram("config_20_{0}".format(OPTS.tech_name))
+        global verify
+        import verify
+
+        import pand2
+
+        debug.info(2, "Testing pand2 gate 4x")
+        a = pand2.pand2(4)
+        self.local_check(a)
+
+        globals.end_openram()
+
+# instantiate a copdsay 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()