def __init__(self, *, size, data_width=32, granularity=8, writable=True):
super().__init__()
if not isinstance(size, int) or size <= 0 or size & size - 1:
raise ValueError(
"Size must be an integer power of two, not {!r}".format(size))
if size < data_width // granularity:
raise ValueError(
"Size {} cannot be lesser than the data width/granularity ratio "
"of {} ({} / {})".format(size, data_width // granularity,
data_width, granularity))
self._mem = Memory(depth=(size * granularity) // data_width,
width=data_width,
name=self.name)
self.bus = wishbone.Interface(addr_width=log2_int(self._mem.depth),
data_width=self._mem.width,
granularity=granularity,
features={"cti", "bte"})
map = MemoryMap(addr_width=log2_int(size), data_width=granularity)
map.add_resource(self._mem, size=size)
self.bus.memory_map = map
self.size = size
self.granularity = granularity
self.writable = writable
def window(self,
*,
addr_width,
data_width,
granularity=None,
features=frozenset(),
alignment=0,
addr=None,
sparse=None):
"""Request a window to a subordinate bus.
See :meth:`nmigen_soc.wishbone.Decoder.add` for details.
Return value
------------
An instance of :class:`nmigen_soc.wishbone.Interface`.
"""
window = wishbone.Interface(addr_width=addr_width,
data_width=data_width,
granularity=granularity,
features=features)
granularity_bits = log2_int(data_width // window.granularity)
window.memory_map = MemoryMap(addr_width=addr_width + granularity_bits,
data_width=window.granularity,
alignment=alignment)
self._windows.append((window, addr, sparse))
return window
def __init__(self, core, data_width=32, granularity=8):
super().__init__(name="wishbone")
self.native_port = core.crossbar.get_native_port()
self.ratio = self.native_port.data_width // data_width
addr_width = log2_int(core.size //
(self.native_port.data_width // data_width))
self.bus = wishbone.Interface(addr_width=addr_width +
log2_int(self.ratio),
data_width=data_width,
granularity=granularity)
map = MemoryMap(addr_width=addr_width + log2_int(self.ratio) +
log2_int(data_width // granularity),
data_width=granularity)
self.bus.memory_map = map
def __init__(self):
self.bus = wishbone.Interface(addr_width=17, data_width=8)
self.bus.memory_map = MemoryMap(addr_width=17, data_width=8)
f = open('../x68kd11s/iplromxv.dat', 'rb')
dat = f.read()
self.mem = Memory(width=8, depth=131072, init=dat)