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pre-dac gain/offsets: detect overflow & underflow
And output maximum / minimum DAC code when over/underflow
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@ -111,6 +111,9 @@ class Dac(Module):
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self.gain = Signal(16)
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self.offset = Signal(16)
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overflow = Signal()
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underflow = Signal()
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###
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subs = [
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@ -120,12 +123,25 @@ class Dac(Module):
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# Infer signed multiplication
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data_raw = Signal((14, True))
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data_buf = Signal(14)
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data_buf = Signal(16)
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self.sync.rio += [
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data_raw.eq(reduce(add, [sub.data for sub in subs])),
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# Extra buffer for better DSP timing
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# Extra buffer for timing for the DSP
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data_buf.eq(((data_raw * Cat(self.gain, ~self.gain[-1])) + (self.offset << 16))[16:]),
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self.data.eq(data_buf),
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If(overflow,
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self.data.eq(0x1fff),
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).Elif(underflow,
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self.data.eq(0x2000),
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).Else(
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self.data.eq(data_buf),
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),
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]
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self.comb += [
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# Overflow condition
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overflow.eq(~data_buf[-1] & (data_buf[-2] | data_buf[-3])),
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# Underflow condition
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underflow.eq(data_buf[-1] & (~data_buf[-2] | ~data_buf[-3])),
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]
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self.i = [ sub.i for sub in subs ]
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