def elaborate(self, plat):
lfsr1 = Lfsr.num_steps(1200)
lfsr2 = Lfsr.num_steps(1000, default_enabled=False)
led1 = plat.request('led_r')
led2 = plat.request('led_g')
m = Module()
# Use both LFSRs
m.d.sync += [
led1.eq(lfsr1.value[0]),
led2.eq(lfsr2.value[0]),
]
# step lfsr2 when lfsr 1 is about to restart
m.d.sync += [lfsr2.enable.eq(watch_lfsr(m, lfsr1, 1199))]
m.submodules += [lfsr1, lfsr2]
return m
def elaborate(self, plat):
lfsr = Lfsr.num_steps(1100)
led = plat.request('led_r')
m = Module()
m.d.sync += led.eq(lfsr.value[0])
m.d.comb += lfsr.restart.eq(watch_lfsr(m, lfsr, 999))
m.submodules += [lfsr]
return m
def __init__(self, n_bits, *, with_enable=False):
self.lfsrs = [
Lfsr.num_steps(501 + 7 * i, restart_value=i) for i in range(n_bits)
]
self.restart = Signal() # Input
self.with_enable = with_enable
if with_enable:
self.enable = Signal() # Input
self.output = Signal(n_bits) # Output
def elaborate(self, plat):
# 89.77 90.62 94.95 95.31 95.31 95.31 95.31 95.31 101.58 107.52
lfsr = Lfsr.num_steps(1100, default_enabled=False)
button = plat.request('button')
led = plat.request('led_r')
m = Module()
m.d.sync += led.eq(lfsr.value[0])
m.d.comb += lfsr.restart.eq(watch_lfsr(m, lfsr, 999))
m.d.comb += lfsr.enable.eq(button)
m.submodules += [lfsr]
return m
def make_lfsr(self):
return Lfsr.num_steps(self.num_words, default_enabled=False)