def __init__(self):
self.read_port = LiteDRAMNativeReadPort(address_width=32,
data_width=data_width)
if pattern is not None:
self.submodules.checker = _LiteDRAMPatternChecker(
self.read_port, init=pattern)
else:
self.submodules.checker = _LiteDRAMBISTChecker(
self.read_port)
self.mem = DRAMMemory(data_width, len(memory), init=memory)
def __init__(self,
mode="bist",
sdram_module="MT48LC16M16",
sdram_data_width=32,
bist_base=0x0000000,
bist_end=0x0100000,
bist_length=1024,
bist_random=False,
bist_alternating=False,
num_generators=1,
num_checkers=1,
access_pattern=None,
**kwargs):
assert mode in ["bist", "pattern"]
assert not (mode == "pattern" and access_pattern is None)
# SimSoC -----------------------------------------------------------------------------------
SimSoC.__init__(self,
with_sdram=True,
sdram_module=sdram_module,
sdram_data_width=sdram_data_width,
**kwargs)
# BIST/Pattern Generator / Checker ---------------------------------------------------------
if mode == "pattern":
make_generator = lambda: _LiteDRAMPatternGenerator(
self.sdram.crossbar.get_port(), init=access_pattern)
make_checker = lambda: _LiteDRAMPatternChecker(
self.sdram.crossbar.get_port(), init=access_pattern)
if mode == "bist":
make_generator = lambda: _LiteDRAMBISTGenerator(self.sdram.crossbar
.get_port())
make_checker = lambda: _LiteDRAMBISTChecker(self.sdram.crossbar.
get_port())
generators = [make_generator() for _ in range(num_generators)]
checkers = [make_checker() for _ in range(num_checkers)]
self.submodules += generators + checkers
if mode == "pattern":
def bist_config(module):
return []
if not bist_alternating:
address_set = set()
for addr, _ in access_pattern:
assert addr not in address_set, \
"Duplicate address 0x%08x in access_pattern, write will overwrite previous value!" % addr
address_set.add(addr)
if mode == "bist":
# Make sure that we perform at least one access
bist_length = max(bist_length,
self.sdram.controller.interface.data_width // 8)
def bist_config(module):
return [
module.base.eq(bist_base),
module.end.eq(bist_end),
module.length.eq(bist_length),
module.random_addr.eq(bist_random),
]
assert not (bist_random and not bist_alternating), \
"Write to random address may overwrite previously written data before reading!"
# Check address correctness
assert bist_end > bist_base
assert bist_end <= 2**(len(
generators[0].end)) - 1, "End address outside of range"
bist_addr_range = bist_end - bist_base
assert bist_addr_range > 0 and bist_addr_range & (bist_addr_range - 1) == 0, \
"Length of the address range must be a power of 2"
def combined_read(modules, signal, operator):
sig = Signal()
self.comb += sig.eq(
reduce(operator, (getattr(m, signal) for m in modules)))
return sig
def combined_write(modules, signal):
sig = Signal()
self.comb += [getattr(m, signal).eq(sig) for m in modules]
return sig
# Sequencer --------------------------------------------------------------------------------
class LiteDRAMCoreControl(Module, AutoCSR):
def __init__(self):
self.init_done = CSRStorage()
self.init_error = CSRStorage()
self.submodules.ddrctrl = ddrctrl = LiteDRAMCoreControl()
self.add_csr("ddrctrl")
display = Signal()
finish = Signal()
self.submodules.fsm = fsm = FSM(reset_state="WAIT-INIT")
fsm.act(
"WAIT-INIT",
If(
self.ddrctrl.init_done.
storage, # Written by CPU when initialization is done
NextState("BIST-GENERATOR")))
if bist_alternating:
# Force generators to wait for checkers and vice versa. Connect them in pairs, with each
# unpaired connected to the first of the others.
bist_connections = []
for generator, checker in zip_longest(generators, checkers):
g = generator or generators[0]
c = checker or checkers[0]
bist_connections += [
g.run_cascade_in.eq(c.run_cascade_out),
c.run_cascade_in.eq(g.run_cascade_out),
]
fsm.act(
"BIST-GENERATOR",
combined_write(generators + checkers, "start").eq(1),
*bist_connections, *map(bist_config, generators + checkers),
If(combined_read(checkers, "done", and_),
NextState("DISPLAY")))
else:
fsm.act(
"BIST-GENERATOR",
combined_write(generators, "start").eq(1),
*map(bist_config, generators),
If(combined_read(generators, "done", and_),
NextState("BIST-CHECKER")))
fsm.act(
"BIST-CHECKER",
combined_write(checkers, "start").eq(1),
*map(bist_config, checkers),
If(combined_read(checkers, "done", and_),
NextState("DISPLAY")))
fsm.act("DISPLAY", display.eq(1), NextState("FINISH"))
fsm.act("FINISH", finish.eq(1))
# Simulation Results -----------------------------------------------------------------------
def max_signal(signals):
signals = iter(signals)
s = next(signals)
out = Signal(len(s))
self.comb += out.eq(s)
for curr in signals:
prev = out
out = Signal(max(len(prev), len(curr)))
self.comb += If(prev > curr, out.eq(prev)).Else(out.eq(curr))
return out
generator_ticks = max_signal((g.ticks for g in generators))
checker_errors = max_signal((c.errors for c in checkers))
checker_ticks = max_signal((c.ticks for c in checkers))
self.sync += [
If(
display,
Display("BIST-GENERATOR ticks: %08d", generator_ticks),
Display("BIST-CHECKER errors: %08d", checker_errors),
Display("BIST-CHECKER ticks: %08d", checker_ticks),
)
]
# Simulation End ---------------------------------------------------------------------------
end_timer = WaitTimer(2**16)
self.submodules += end_timer
self.comb += end_timer.wait.eq(finish)
self.sync += If(end_timer.done, Finish())