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soc/core/clock: allow selecting buffer type (None, BUFG, BUFR). (default = BUFG)

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This commit is contained in:
Florent Kermarrec 2018-09-25 08:35:50 +02:00
parent 912ca3236b
commit 6cd954940c
1 changed files with 15 additions and 6 deletions
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21
litex/soc/cores/clock.py
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@ -45,16 +45,25 @@ class S7Clocking(Module):
raise ValueError
self.clkin_freq = freq
def create_clkout(self, cd, freq, phase=0):
def create_clkout(self, cd, freq, phase=0, buf="bufg"):
assert self.nclkouts < self.nclkouts_max
clkout = Signal()
clkout_bufg = Signal()
self.specials += AsyncResetSynchronizer(cd, ~self.locked | self.reset),
self.specials += Instance("BUFG", i_I=clkout, o_O=clkout_bufg)
self.comb += cd.clk.eq(clkout_bufg)
self.clkouts[self.nclkouts] = (clkout, freq, phase)
self.nclkouts += 1
return clkout_bufg
self.specials += AsyncResetSynchronizer(cd, ~self.locked | self.reset)
if buf is None:
self.comb += cd.clk.eq(clkout)
else:
clkout_buf = Signal()
self.comb += cd.clk.eq(clkout_buf)
if buf == "bufg":
self.specials += Instance("BUFG", i_I=clkout, o_O=clkout_buf)
elif buf == "bufr":
self.specials += Instance("BUFR", i_I=clkout, o_O=clkout_buf)
else:
raise ValueError
return clkout_buf
def compute_config(self):
config = {}