I'm having some trouble with using a ``Memory``, in ``elaborate`` in a module I have

```
        lut = Memory(width=self.width, depth=2**self.depth, init=sine_seg)

        m.submodules.lut_read_port = lut_read_port = lut.read_port(transparent=False)

        m.d.comb += lut_read_port.addr.eq(self.inp)
        m.d.comb += self.out.eq(lut_read_port.data)
```

and in a simulator I have 

```
        yield top.inp.eq(40)
        yield Settle()
        o = yield top.out
```

and unfortunately, o seems to wind up 0. Am I misusing Memory()?