4 files changed, 176 insertions, 0 deletions
diff --git a/archive/testing/async_reset.py b/archive/testing/async_reset.py
new file mode 100644
index 0000000..4760df7
--- /dev/null
+++ b/archive/testing/async_reset.py
@@ -0,0 +1,21 @@
+from amaranth import *
+from amaranth.cli import main
+
+
+class ClockDivisor(Elaboratable):
+    def __init__(self, factor):
+        self.v = Signal(factor)
+        self.o = Signal()
+
+    def elaborate(self, platform):
+        m = Module()
+        m.d.sync += self.v.eq(self.v + 1)
+        m.d.comb += self.o.eq(self.v[-1])
+        return m
+
+
+if __name__ == "__main__":
+    m = Module()
+    m.domains.sync = sync = ClockDomain("sync", async_reset=True)
+    m.submodules.ctr = ctr = ClockDivisor(factor=16)
+    main(m, ports=[ctr.o, sync.clk])
+\ No newline at end of file
diff --git a/archive/testing/multi_clock.py b/archive/testing/multi_clock.py
new file mode 100644
index 0000000..e377156
--- /dev/null
+++ b/archive/testing/multi_clock.py
@@ -0,0 +1,75 @@
+import sys
+from amaranth import *
+from amaranth.back import verilog, cxxrtl
+from amaranth.cli import main
+from amaranth.sim import Simulator, Settle, Delay
+
+BASENAME = "multi_clock"
+
+class SubM(Elaboratable):
+    def __init__(self, domain=None):
+        self.inv = Signal()
+        self.domain=domain
+
+    def elaborate(self, platform):
+        m = Module()
+
+        m.d.sync += self.inv.eq(~self.inv)
+
+        return m
+
+class top(Elaboratable):
+    def __init__(self):
+        self.sig_slow = Signal()
+        self.sig_fast = Signal()
+
+        self.div = Signal(2)
+
+    def elaborate(self, platform):
+        m = Module()
+
+        m.domains += ClockDomain('slow')
+        m.d.sync += [self.div.eq(self.div + 1)]
+        m.d.comb += ClockSignal('slow').eq(self.div[-1])
+
+        m.submodules.subm1 = SubM()
+        m.submodules.subm2 = DomainRenamer("slow")(SubM())
+
+        m.d.sync += self.sig_fast.eq(m.submodules.subm1.inv)
+        m.d.slow += self.sig_slow.eq(m.submodules.subm2.inv)
+
+        return m
+
+def test_shift_reg():
+    dut = top()
+
+    def proc1():
+        for _ in range(16):
+            yield
+            yield Settle()
+    
+    sim = Simulator(dut)
+    sim.add_clock(1e-6)
+    sim.add_sync_process(proc1)
+    
+    with sim.write_vcd(BASENAME + '.vcd'):
+        sim.run()
+
+
+if __name__ == '__main__':
+
+    if sys.argv[1] == "sim":
+        test_shift_reg()
+        exit()
+
+    # m = ShiftReg(8)
+
+    # if sys.argv[1] == "v":
+    #     out = verilog.convert(m, ports=m.ports)
+    #     with open(BASENAME + '.v','w') as f:
+    #         f.write(out)
+    
+    # elif sys.argv[1] == "cc":
+    #     out = cxxrtl.convert(m, ports=m.ports)
+    #     with open(BASENAME + '.cc','w') as f:
+    #         f.write(out)
diff --git a/archive/testing/up_counter.py b/archive/testing/up_counter.py
new file mode 100644
index 0000000..050a6b0
--- /dev/null
+++ b/archive/testing/up_counter.py
@@ -0,0 +1,50 @@
+from amaranth import *
+from amaranth.back import verilog
+
+
+class UpCounter(Elaboratable):
+    """
+    A 16-bit up counter with a fixed limit.
+
+    Parameters
+    ----------
+    limit : int
+        The value at which the counter overflows.
+
+    Attributes
+    ----------
+    en : Signal, in
+        The counter is incremented if ``en`` is asserted, and retains
+        its value otherwise.
+    ovf : Signal, out
+        ``ovf`` is asserted when the counter reaches its limit.
+    """
+    
+    def __init__(self, limit):
+        self.limit = limit
+
+        # Ports
+        self.en  = Signal()
+        self.ovf = Signal()
+
+        # State
+        self.count = Signal(16)
+
+    def elaborate(self, platform):
+        m = Module()
+
+        m.d.comb += self.ovf.eq(self.count == self.limit)
+
+        with m.If(self.en):
+            with m.If(self.ovf):
+                m.d.sync += self.count.eq(0)
+            with m.Else():
+                m.d.sync += self.count.eq(self.count + 1)
+
+        return m
+
+    def to_v(self):
+        return verilog.convert(self, ports=[self.en, self.ovf])
+
+top = UpCounter(25)
+print(top.to_v())
+\ No newline at end of file
diff --git a/archive/testing/up_counter_tb.py b/archive/testing/up_counter_tb.py
new file mode 100644
index 0000000..7c2e8d2
--- /dev/null
+++ b/archive/testing/up_counter_tb.py
@@ -0,0 +1,30 @@
+from amaranth.sim import Simulator
+from up_counter import UpCounter
+
+dut = UpCounter(25)
+
+
+def bench():
+    # Disabled counter should not overflow.
+    yield dut.en.eq(0)
+    for _ in range(30):
+        yield
+        assert not (yield dut.ovf)
+
+    # Once enabled, the counter should overflow in 25 cycles.
+    yield dut.en.eq(1)
+    for _ in range(25):
+        yield
+        assert not (yield dut.ovf)
+    yield
+    assert (yield dut.ovf)
+
+    # The overflow should clear in one cycle.
+    yield
+    assert not (yield dut.ovf)
+
+sim = Simulator(dut)
+sim.add_clock(1e-6) # 1 MHz
+sim.add_sync_process(bench)
+with sim.write_vcd("up_counter.vcd"):
+    sim.run()
+\ No newline at end of file