add function unit module

diff --git a/src/add/function_unit.py b/src/add/function_unit.py
new file mode 100644 (file)
index 0000000..933a7fc
--- /dev/null
+++ b/src/add/function_unit.py
@@ -0,0 +1,44 @@
+from nmigen import Signal, Cat, Const, Mux, Module, Array
+from nmigen.cli import main, verilog
+
+from nmigen_add_experiment import FPADD
+from rstation_row import ReservationStationRow
+
+from math import log
+
+class FunctionUnit:
+
+    def __init__(self, width, num_units):
+        """ Function Unit
+
+            * width: bit-width of IEEE754.  supported: 16, 32, 64
+            * num_units: number of Reservation Stations
+        """
+        self.width = width
+
+        fus = []
+        bsz = int(log(width) / log(2))
+        for i in range(num_units):
+            mid = Const(i, bsz)
+            rs = ReservationStationRow(width, mid)
+            rs.name = "RS%d" % i
+            fus.append(rs)
+        self.fus = Array(fus)
+
+    def get_fragment(self, platform=None):
+        """ creates the HDL code-fragment for ReservationStationRow
+        """
+        m = Module()
+
+        return m
+
+
+if __name__ == "__main__":
+    rs = ReservationStationRow(width=32, id_wid=Const(1,4)
+    main(alu, ports=[rs.in_a, rs.in_b, rs.out_z]
+
+    # works... but don't use, just do "python fname.py convert -t v"
+    #print (verilog.convert(alu, ports=[
+    #                        ports=alu.in_a.ports() + \
+    #                              alu.in_b.ports() + \
+    #                              alu.out_z.ports())