50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
from migen.fhdl import structure as f
|
|
from migen.fhdl import verilog
|
|
from functools import partial
|
|
|
|
class Divider:
|
|
def __init__(self, w):
|
|
self.w = w
|
|
|
|
d = partial(f.Declare, self)
|
|
|
|
d("start_i")
|
|
d("dividend_i", f.BV(w))
|
|
d("divisor_i", f.BV(w))
|
|
d("ready_o")
|
|
d("quotient_o", f.BV(w))
|
|
d("remainder_o", f.BV(w))
|
|
|
|
d("_qr", f.BV(2*w))
|
|
d("_counter", f.BV(f.BitsFor(w)))
|
|
d("_divisor_r", f.BV(w))
|
|
d("_diff", f.BV(w+1))
|
|
|
|
def GetFragment(self):
|
|
a = f.Assign
|
|
comb = [
|
|
a(self.quotient_o, self._qr[:self.w]),
|
|
a(self.remainder_o, self._qr[self.w:]),
|
|
a(self.ready_o, self._counter == f.Constant(0, self._counter.bv)),
|
|
a(self._diff, self.remainder_o - self._divisor_r)
|
|
]
|
|
sync = [
|
|
f.If(self.start_i == 1, [
|
|
a(self._counter, self.w),
|
|
a(self._qr, self.dividend_i),
|
|
a(self._divisor_r, self.divisor_i)
|
|
], [
|
|
f.If(self.ready_o == 0, [
|
|
f.If(self._diff[self.w] == 1,
|
|
[a(self._qr, f.Cat(0, self._qr[:2*self.w-1]))],
|
|
[a(self._qr, f.Cat(1, self._qr[:self.w-1], self._diff[:self.w]))]),
|
|
a(self._counter, self._counter - f.Constant(1, self._counter.bv)),
|
|
])
|
|
])
|
|
]
|
|
return f.Fragment(comb, sync)
|
|
|
|
d = Divider(32)
|
|
frag = d.GetFragment()
|
|
o = verilog.Convert(frag, {d.ready_o, d.quotient_o, d.remainder_o, d.start_i, d.dividend_i, d.divisor_i})
|
|
print(o) |