A Python package for testing hardware (part of the magma ecosystem)
Project description
Fault
A Python package for testing hardware (part of the magma ecosystem).
Example
Here is a simple ALU defined in magma.
import magma as m
import mantle
class ConfigReg(m.Circuit):
IO = ["D", m.In(m.Bits(2)), "Q", m.Out(m.Bits(2))] + \
m.ClockInterface(has_ce=True)
@classmethod
def definition(io):
reg = mantle.Register(2, has_ce=True, name="conf_reg")
io.Q <= reg(io.D, CE=io.CE)
class SimpleALU(m.Circuit):
IO = ["a", m.In(m.UInt(16)),
"b", m.In(m.UInt(16)),
"c", m.Out(m.UInt(16)),
"config_data", m.In(m.Bits(2)),
"config_en", m.In(m.Enable),
] + m.ClockInterface()
@classmethod
def definition(io):
opcode = ConfigReg(name="config_reg")(io.config_data, CE=io.config_en)
io.c <= mantle.mux(
[io.a + io.b, io.a - io.b, io.a * io.b, io.a / io.b], opcode)
Here's an example test in fault that uses the configuration interface, expects a value on the internal register, and checks the result of performing the expected operation.
import operator
ops = [operator.add, operator.sub, operator.mul, operator.div]
tester = fault.Tester(SimpleALU, SimpleALU.CLK)
tester.circuit.CLK = 0
tester.circuit.config_en = 1
for i in range(0, 4):
tester.circuit.config_data = i
tester.step(2)
tester.circuit.a = 3
tester.circuit.b = 2
tester.eval()
tester.circuit.c.expect(ops[i](3, 2))
We can run this with three different simulators
tester.compile_and_run("verilator", flags=["-Wno-fatal"],
magma_opts={"verilator_debug": True}, directory="build")
tester.compile_and_run("system-verilog", simulator="ncsim", directory="build")
tester.compile_and_run("system-verilog", simulator="vcs", directory="build")
If you're using mantle.Register from the coreir implementation, you can
also poke the internal register value directly using the value field. Notice
that conf_reg is defined in ConfigReg to be an instance of
mantle.Register and the test bench pokes it by setting confg_reg.value
equal to 1.
tester = fault.Tester(SimpleALU, SimpleALU.CLK)
tester.circuit.CLK = 0
# Initialize
tester.step(2)
for i in reversed(range(4)):
tester.circuit.config_reg.conf_reg.value = i
tester.step(2)
tester.circuit.config_reg.conf_reg.O.expect(i)
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