1 # IEEE Floating Point Adder (Single Precision)
2 # Copyright (C) Jonathan P Dawson 2013
5 from nmigen
import Module
, Signal
, Elaboratable
6 from nmigen
.cli
import main
, verilog
8 from ieee754
.fpcommon
.fpbase
import FPNumOut
9 from ieee754
.fpcommon
.fpbase
import FPState
10 from .roundz
import FPRoundData
11 from nmutil
.singlepipe
import Object
14 class FPPackData(Object
):
16 def __init__(self
, width
, id_wid
):
18 self
.z
= Signal(width
, reset_less
=True)
19 self
.mid
= Signal(id_wid
, reset_less
=True)
22 class FPPackMod(Elaboratable
):
24 def __init__(self
, width
, id_wid
):
31 return FPRoundData(self
.width
, self
.id_wid
)
34 return FPPackData(self
.width
, self
.id_wid
)
39 def setup(self
, m
, in_z
):
40 """ links module to inputs and outputs
42 m
.submodules
.pack
= self
43 m
.d
.comb
+= self
.i
.eq(in_z
)
45 def elaborate(self
, platform
):
47 z
= FPNumOut(self
.width
, False)
48 m
.submodules
.pack_in_z
= self
.i
.z
49 m
.submodules
.pack_out_z
= z
50 m
.d
.comb
+= self
.o
.mid
.eq(self
.i
.mid
)
51 with m
.If(~self
.i
.out_do_z
):
52 with m
.If(self
.i
.z
.is_overflowed
):
53 m
.d
.comb
+= z
.inf(self
.i
.z
.s
)
55 m
.d
.comb
+= z
.create(self
.i
.z
.s
, self
.i
.z
.e
, self
.i
.z
.m
)
57 m
.d
.comb
+= z
.v
.eq(self
.i
.oz
)
58 m
.d
.comb
+= self
.o
.z
.eq(z
.v
)
62 class FPPack(FPState
):
64 def __init__(self
, width
, id_wid
):
65 FPState
.__init
__(self
, "pack")
66 self
.mod
= FPPackMod(width
)
67 self
.out_z
= self
.ospec()
70 return self
.mod
.ispec()
73 return self
.mod
.ospec()
75 def setup(self
, m
, in_z
):
76 """ links module to inputs and outputs
78 self
.mod
.setup(m
, in_z
)
80 m
.d
.sync
+= self
.out_z
.v
.eq(self
.mod
.out_z
.v
)
81 m
.d
.sync
+= self
.out_z
.mid
.eq(self
.mod
.o
.mid
)