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zynq_clocking: add ext_async_rst to AsyncRstSYNCR

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linuswck 2023-11-06 12:24:44 +08:00 committed by sb10q
parent 79fc5a7789
commit 07044752b6
1 changed files with 12 additions and 3 deletions
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15
src/gateware/zynq_clocking.py
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@ -65,7 +65,7 @@ class ClockSwitchFSM(Module):
class SYSCRG(Module, AutoCSR):
def __init__(self, platform, ps7, main_clk, clk_sw=None, freq=125e6):
def __init__(self, platform, ps7, main_clk, clk_sw=None, freq=125e6, ext_async_rst=None):
# assumes bootstrap clock is same freq as main and sys output
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
@ -125,10 +125,19 @@ class SYSCRG(Module, AutoCSR):
Instance("BUFG", i_I=mmcm_sys, o_O=self.cd_sys.clk),
Instance("BUFG", i_I=mmcm_sys4x, o_O=self.cd_sys4x.clk),
Instance("BUFG", i_I=mmcm_clk208, o_O=self.cd_clk200.clk),
AsyncResetSynchronizer(self.cd_sys, ~self.mmcm_locked),
AsyncResetSynchronizer(self.cd_clk200, ~self.mmcm_locked),
]
if ext_async_rst is not None:
self.specials += [
AsyncResetSynchronizer(self.cd_sys, ~self.mmcm_locked | ext_async_rst),
AsyncResetSynchronizer(self.cd_clk200, ~self.mmcm_locked | ext_async_rst),
]
else:
self.specials += [
AsyncResetSynchronizer(self.cd_sys, ~self.mmcm_locked),
AsyncResetSynchronizer(self.cd_clk200, ~self.mmcm_locked),
]
reset_counter = Signal(4, reset=15)
ic_reset = Signal(reset=1)
self.sync.clk200 += \