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build/altera/common: added special AsyncResetSynchronizer based on altera_std_synchronizer_nocut #2056

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merged 1 commit into from
Sep 3, 2024
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build/altera/common: added special AsyncResetSynchronizer based on altera_std_synchronizer_nocut #2056

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20 changes: 19 additions & 1 deletion litex/build/altera/common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,24 @@ def lower(dr):
SDRInput: AlteraSDRInput,
}

# Agilex5 AsyncResetSynchronizer -------------------------------------------------------------------

class Agilex5AsyncResetSynchronizerImpl(Module):
def __init__(self, cd, async_reset):
self.specials += Instance("altera_std_synchronizer_nocut", name=f"ars_cd_{cd.name}_ff0",
p_depth = 3,
p_rst_value = 0,
i_clk = cd.clk,
i_reset_n = Constant(1, 1),
i_din = async_reset,
o_dout = cd.rst,
)

class Agilex5AsyncResetSynchronizer:
@staticmethod
def lower(dr):
return Agilex5AsyncResetSynchronizerImpl(dr.cd, dr.async_reset)

# Agilex5 DDROutput --------------------------------------------------------------------------------

class Agilex5DDROutputImpl(Module):
Expand Down Expand Up @@ -237,7 +255,7 @@ def lower(dr):
# Agilex5 Special Overrides ------------------------------------------------------------------------

agilex5_special_overrides = {
AsyncResetSynchronizer: AlteraAsyncResetSynchronizer,
AsyncResetSynchronizer: Agilex5AsyncResetSynchronizer,
DifferentialInput: AlteraDifferentialInput,
DifferentialOutput: AlteraDifferentialOutput,
DDROutput: Agilex5DDROutput,
Expand Down
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