move fpcommon to separate subdir

[ieee754fpu.git] / src / ieee754 / fpcommon / normtopack.py

diff --git a/src/ieee754/fpcommon/normtopack.py b/src/ieee754/fpcommon/normtopack.py
new file mode 100644 (file)
index 0000000..87d0812
--- /dev/null
+++ b/src/ieee754/fpcommon/normtopack.py
@@ -0,0 +1,52 @@
+# IEEE Floating Point Adder (Single Precision)
+# Copyright (C) Jonathan P Dawson 2013
+# 2013-12-12
+
+#from nmigen.cli import main, verilog
+
+from singlepipe import StageChain, SimpleHandshake
+
+from fpbase import FPState, FPID
+from fpcommon.postcalc import FPAddStage1Data
+from fpcommon.postnormalise import FPNorm1ModSingle
+from fpcommon.roundz import FPRoundMod
+from fpcommon.corrections import FPCorrectionsMod
+from fpcommon.pack import FPPackData, FPPackMod
+
+
+class FPNormToPack(FPState, SimpleHandshake):
+
+    def __init__(self, width, id_wid):
+        FPState.__init__(self, "normalise_1")
+        self.id_wid = id_wid
+        self.width = width
+        SimpleHandshake.__init__(self, self) # pipeline is its own stage
+
+    def ispec(self):
+        return FPAddStage1Data(self.width, self.id_wid) # Norm1ModSingle ispec
+
+    def ospec(self):
+        return FPPackData(self.width, self.id_wid) # FPPackMod ospec
+
+    def setup(self, m, i):
+        """ links module to inputs and outputs
+        """
+
+        # Normalisation, Rounding Corrections, Pack - in a chain
+        nmod = FPNorm1ModSingle(self.width, self.id_wid)
+        rmod = FPRoundMod(self.width, self.id_wid)
+        cmod = FPCorrectionsMod(self.width, self.id_wid)
+        pmod = FPPackMod(self.width, self.id_wid)
+        stages = [nmod, rmod, cmod, pmod]
+        chain = StageChain(stages)
+        chain.setup(m, i)
+        self.out_z = pmod.ospec()
+
+        self.o = pmod.o
+
+    def process(self, i):
+        return self.o
+
+    def action(self, m):
+        m.d.sync += self.out_z.eq(self.process(None))
+        m.next = "pack_put_z"