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52 lines
1.1 KiB
Python
52 lines
1.1 KiB
Python
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from fractions import Fraction
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from migen.fhdl.structure import *
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class M1CRG:
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def __init__(self, infreq, outfreq1x):
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self.clkin = Signal()
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self.trigger_reset = Signal()
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generated = []
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for name in [
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"sys_clk",
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"sys_rst",
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"ac97_rst_n",
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"videoin_rst_n",
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"flash_rst_n",
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"clk2x_90",
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"clk4x_wr_left",
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"clk4x_wr_strb_left",
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"clk4x_wr_right",
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"clk4x_wr_strb_right",
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"clk4x_rd_left",
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"clk4x_rd_strb_left",
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"clk4x_rd_right",
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"clk4x_rd_strb_right"
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]:
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s = Signal(name=name)
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setattr(self, name, s)
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generated.append((name, s))
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self.rd_clk_lb = Signal()
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ratio = Fraction(outfreq1x)/Fraction(infreq)
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in_period = float(Fraction(1000000000)/Fraction(infreq))
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self._inst = Instance("m1crg",
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generated,
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[
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("clkin", self.clkin),
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("trigger_reset", self.trigger_reset),
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("rd_clk_lb", self.rd_clk_lb) # TODO: inout
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], [
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("in_period", in_period),
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("f_mult", ratio.numerator),
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("f_div", ratio.denominator)
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]
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)
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def get_fragment(self):
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return Fragment(instances=[self._inst],
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pads={self.clkin, self.ac97_rst_n, self.videoin_rst_n, self.flash_rst_n, self.rd_clk_lb})
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