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fir: check widths
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@ -78,13 +78,20 @@ class ParallelFIR(Module):
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c_shift = bits_for(floor((1 << w.B - 2) / c_max))
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self.coefficients = cs = [int(round(c*(1 << c_shift)))
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for c in coefficients]
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assert max(bits_for(c) for c in cs) <= w.B
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###
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# Delay line: increasing delay
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x = [Signal((w.A, True)) for _ in range(n + p - 1)]
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x_shift = w.A - width - bits_for(
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max(cs.count(c) for c in cs if c) - 1)
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x_shift = w.A - width
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# reduce by pre-adder gain
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x_shift -= bits_for(max(cs.count(c) for c in cs if c) - 1)
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# TODO: reduce by P width limit?
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assert x_shift + width <= w.A
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assert sum(abs(c)*(1 << w.A - 1) for c in cs) <= (1 << w.P - 1) - 1
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for xi, xj in zip(x, self.i[::-1]):
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self.sync += xi.eq(xj << x_shift)
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for xi, xj in zip(x[len(self.i):], x):
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