def mkROMDefinition(name,
values,
size,
datawidth,
sync=False,
with_enable=False):
if not sync and with_enable:
raise ValueError('Async ROM cannot have enable signals')
m = Module(name)
clk = m.Input('CLK') if sync else None
addr = m.Input('addr', size)
if with_enable:
enable = m.Input('enable')
val = m.OutputReg('val', datawidth)
if clk is not None:
alw = m.Always(vtypes.Posedge(clk))
else:
alw = m.Always()
patterns = [
vtypes.When(i)(val(v, blk=not sync)) for i, v in enumerate(values)
]
body = vtypes.Case(addr)(*patterns)
if with_enable:
body = vtypes.If(enable)(body)
alw(body)
return m
def mkUartRx(baudrate=19200, clockfreq=100 * 1000 * 1000):
m = Module("UartRx")
waitnum = int(clockfreq / baudrate)
clk = m.Input('CLK')
rst = m.Input('RST')
rxd = m.Input('rxd')
dout = m.OutputReg('dout', 8, initval=0)
valid = m.OutputReg('valid', initval=0)
fsm = FSM(m, 'fsm', clk, rst)
mem = m.TmpReg(9, initval=0)
waitcount = m.TmpReg(int(math.log(waitnum, 2)) + 1, initval=0)
fsm(valid(0), waitcount(int(waitnum / 2) - 1),
mem(vtypes.Cat(rxd, mem[1:9])))
fsm.If(rxd == 0).goto_next()
for i in range(10):
if i == 0: # check the start bit again
fsm.If(vtypes.Ands(waitcount == 1, rxd != 0)).goto_init()
fsm.If(waitcount > 0)(waitcount.dec()).Else(
mem(vtypes.Cat(rxd, mem[1:9])), waitcount(waitnum - 1))
fsm.Then().goto_next()
fsm(valid(1), dout(mem[0:9]))
fsm.goto_init()
fsm.make_always()
return m
def mkUartTx(baudrate=19200, clockfreq=100 * 1000 * 1000):
m = Module("UartTx")
waitnum = int(clockfreq / baudrate)
clk = m.Input('CLK')
rst = m.Input('RST')
din = m.Input('din', 8)
enable = m.Input('enable')
ready = m.OutputReg('ready', initval=1)
txd = m.OutputReg('txd', initval=1)
fsm = FSM(m, 'fsm', clk, rst)
mem = m.TmpReg(9, initval=0)
waitcount = m.TmpReg(int(math.log(waitnum, 2)) + 1, initval=0)
fsm(waitcount(waitnum - 1), txd(1), mem(vtypes.Cat(din, vtypes.Int(0, 1))))
fsm.If(enable)(ready(0))
fsm.Then().goto_next()
for i in range(10):
fsm.If(waitcount > 0)(waitcount.dec()).Else(
txd(mem[0]), mem(vtypes.Cat(vtypes.Int(1, 1), mem[1:9])),
waitcount(waitnum - 1))
fsm.Then().goto_next()
fsm(ready(1))
fsm.goto_init()
fsm.make_always()
return m
def mkROMDefinition(name, values, size, datawidth, sync=False):
m = Module(name)
clk = m.Input('CLK') if sync else None
addr = m.Input('addr', size)
val = m.OutputReg('val', datawidth)
if clk is not None:
alw = m.Always(vtypes.Posedge(clk))
else:
alw = m.Always()
patterns = [
vtypes.When(i)(val(v, blk=not sync)) for i, v in enumerate(values)
]
alw(vtypes.Case(addr)(*patterns))
return m
if isinstance(src, (vtypes.Parameter, vtypes.Localparam)):
if src.name in fsm_orig_labels:
fsm_labels[src.name] = m.Localparam(src.name, src.value)
continue
arg_name = src.name
v = m.Parameter(arg_name, src.value, src.width, src.signed)
src_rename_dict[src.name] = v
params[arg_name] = src
src_rename_visitor = SrcRenameVisitor(src_rename_dict)
state_width = src_rename_visitor.visit(self.state.width)
state_initval = src_rename_visitor.visit(self.state.initval)
state = m.OutputReg(self.state.name,
state_width,
initval=state_initval)
out_state = self.m.TmpWire(state_width,
prefix='_%s_out' % self.state.name)
self.m.Always()(self.state(out_state, blk=True))
ports[state.name] = out_state
src_rename_dict[self.state.name] = state
for delay, s in sorted(self.delayed_state.items(), key=lambda x: x[0]):
s_width = src_rename_visitor.visit(s.width)
s_initval = src_rename_visitor.visit(s.initval)
d = m.OutputReg(s.name, s_width, initval=s_initval)
out_d = self.m.TmpWire(s_width, prefix='_%s_out' % d.name)
self.m.Always()(s(out_d, blk=True))
ports[s.name] = out_d
def make_module(self, reset=(), body=()):
if self.done:
#raise ValueError('make_always() has been already called.')
return
self.done = True
m = Module(self.name)
clk = m.Input('CLK')
if self.rst is not None:
rst = m.Input('RST')
else:
rst = None
body = list(body) + list(self.make_code())
dsts = self.dst_var.values()
src_visitor = SubstSrcVisitor()
# collect sources in destination variable definitions
for dst in dsts:
if isinstance(dst, (vtypes.Pointer, vtypes.Slice, vtypes.Cat)):
raise ValueError(
'Partial assignment is not supported by as_module mode.')
if isinstance(dst, vtypes._Variable):
if dst.width is not None:
src_visitor.visit(dst.width)
if dst.length is not None:
src_visitor.visit(dst.length)
# collect sources in statements
for statement in body:
src_visitor.visit(statement)
srcs = src_visitor.srcs.values()
# collect sources in source variable definitions
for src in srcs:
if isinstance(src, vtypes._Variable):
if src.width is not None:
src_visitor.visit(src.width)
if src.length is not None:
src_visitor.visit(src.length)
srcs = src_visitor.srcs.values()
params = collections.OrderedDict()
ports = collections.OrderedDict()
src_rename_dict = collections.OrderedDict()
# create parameter/localparam definitions
for src in srcs:
if isinstance(src, (vtypes.Parameter, vtypes.Localparam)):
arg_name = src.name
v = m.Parameter(arg_name, src.value, src.width, src.signed)
src_rename_dict[src.name] = v
params[arg_name] = src
src_rename_visitor = SrcRenameVisitor(src_rename_dict)
for src in srcs:
if isinstance(src, (vtypes.Parameter, vtypes.Localparam)):
continue
arg_name = 'i_%s' % src.name
if src.length is not None:
width = src.bit_length()
length = src.length
pack_width = vtypes.Mul(width, length)
out_line = self.m.TmpWire(
pack_width, prefix='_%s_%s' % (self.name, src.name))
i = self.m.TmpGenvar(prefix='i')
v = out_line[i * width:(i + 1) * width]
g = self.m.GenerateFor(i(0), i < length, i(i + 1))
p = g.Assign(v(src[i]))
rep_width = (src_rename_visitor.visit(src.width)
if src.width is not None else None)
rep_length = src_rename_visitor.visit(src.length)
pack_width = (rep_length if rep_width is None else
vtypes.Mul(rep_length, rep_width))
in_line = m.Input(arg_name + '_line', pack_width,
signed=src.get_signed())
in_array = m.Wire(arg_name, rep_width, rep_length,
signed=src.get_signed())
i = m.TmpGenvar(prefix='i')
v = in_line[i * rep_width:(i + 1) * rep_width]
g = m.GenerateFor(i(0), i < rep_length, i(i + 1))
p = g.Assign(in_array[i](v))
src_rename_dict[src.name] = in_array
ports[in_line.name] = out_line
else:
rep_width = (src_rename_visitor.visit(src.width)
if src.width is not None else None)
v = m.Input(arg_name, rep_width, signed=src.get_signed())
src_rename_dict[src.name] = v
ports[arg_name] = src
for dst in dsts:
arg_name = dst.name
rep_width = (src_rename_visitor.visit(dst.width)
if dst.width is not None else None)
out = m.OutputReg(arg_name, rep_width, signed=dst.get_signed())
out_wire = self.m.TmpWire(rep_width, signed=dst.get_signed(),
prefix='_%s_%s' % (self.name, arg_name))
self.m.Always()(dst(out_wire, blk=True))
ports[arg_name] = out_wire
body = [src_rename_visitor.visit(statement)
for statement in body]
reset = list(reset) + list(self.make_reset())
if not reset and not body:
pass
elif not reset or rst is None:
m.Always(vtypes.Posedge(clk))(
body,
)
else:
m.Always(vtypes.Posedge(clk))(
vtypes.If(rst)(
reset,
)(
body,
))
arg_params = [(name, param) for name, param in params.items()]
arg_ports = [('CLK', self.clk)]
if self.rst is not None:
arg_ports.append(('RST', self.rst))
arg_ports.extend([(name, port) for name, port in ports.items()])
sub = Submodule(self.m, m, 'inst_' + m.name, '_%s_' % self.name,
arg_params=arg_params, arg_ports=arg_ports)
