| from library import Switch, AND, OR |
| from library.compounds.control import PulseShortener |
| from library.compounds.flipflop import FlipFlop |
| from stargate import Compound, Transmitter |
|
|
|
|
| class SyncCounter(Compound): |
| def __init__(self, bits_n, *args, **kwargs): |
| super(SyncCounter, self).__init__(*args, **kwargs) |
| self.bits_n = bits_n |
| self.build() |
|
|
| def build(self): |
| logic_compound = Compound(self, 'LOGIC') |
| enable = Transmitter(self, 'ENABLE') |
| clk = PulseShortener(1, self, 'CLK') |
| self.bits = [] |
| bit = FlipFlop(self, 'B0') |
| enable >> bit.enable |
| self.bits.append(bit) |
| prev = bit |
| for i in range(1, self.bits_n): |
| bit = FlipFlop(self, 'B%i' % i) |
| self.bits.append(bit) |
| prev >> bit.enable |
| if i != self.bits_n - 1: |
| and_ = AND(logic_compound, 'L%i' % i) |
| prev >> and_.first |
| bit >> and_.second |
| prev = and_ |
| for bit in self.bits: |
| clk >> bit.data |
| self.enable = enable.default_input |
| self.data = clk.default_input |
|
|
|
|
| class CounterResetter(Compound): |
| def __init__(self, counter, *args, **kwargs): |
| super(CounterResetter, self).__init__(*args, **kwargs) |
| self.counter = counter |
| self.build() |
|
|
| def build(self): |
| logicblock = Compound(self, 'LOGIC') |
| shortener = PulseShortener(1, self, 'SIGNAL') |
| repeater = shortener >> OR(self, 'REPEATER').first |
| signal = shortener | repeater |
| for i, bit in enumerate(self.counter.bits): |
| and_ = AND(logicblock, 'A%i' % i) |
| bit >> and_.first |
| signal >> and_.second |
| and_ >> bit.switch |
| self.inputs.append(shortener.default_input) |
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