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dvisampler/clocking: generate pix reset

This commit is contained in:
Sebastien Bourdeauducq 2013-03-21 19:02:04 +01:00
parent 2315544b36
commit fa2331e084
1 changed files with 10 additions and 11 deletions
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21
milkymist/dvisampler/clocking.py
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@ -66,18 +66,17 @@ class Clocking(Module, AutoReg):
self.specials += MultiReg(locked_async, self.locked, "sys") self.specials += MultiReg(locked_async, self.locked, "sys")
self.comb += self._r_locked.field.w.eq(self.locked) self.comb += self._r_locked.field.w.eq(self.locked)
# sychronize pix5x reset # sychronize pix+pix5x reset
# this reset is also sampled in the sys clock domain, also guarantee pix_rst_n = 1
# a sufficient minimum pulse width. for i in range(2):
pix5x_rst_n = 1 new_pix_rst_n = Signal()
for i in range(5):
new_pix5x_rst_n = Signal()
self.specials += Instance("FDCE", self.specials += Instance("FDCE",
Instance.Input("D", pix5x_rst_n), Instance.Input("D", pix_rst_n),
Instance.Input("CE", 1), Instance.Input("CE", 1),
Instance.Input("C", ClockSignal("pix5x")), Instance.Input("C", ClockSignal("pix")),
Instance.Input("CLR", ~locked_async), Instance.Input("CLR", ~locked_async),
Instance.Output("Q", new_pix5x_rst_n) Instance.Output("Q", new_pix_rst_n)
) )
pix5x_rst_n = new_pix5x_rst_n pix_rst_n = new_pix_rst_n
self.comb += self._cd_pix5x.rst.eq(~pix5x_rst_n) self.comb += self._cd_pix.rst.eq(~pix_rst_n)
self.comb += self._cd_pix5x.rst.eq(~pix_rst_n)