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test_adder.py
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test_adder.py
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import cocotb
from cocotb.clock import Clock
from cocotb.triggers import RisingEdge, FallingEdge, ClockCycles, Timer
from rich.progress import Progress
import random
# for spice
@cocotb.test()
async def test_bypass_minimal(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
await ClockCycles(dut.clk, 10)
dut.reset = 1
dut.stop_b = 0
dut.extra_inverter = 1
dut.a_input = 0
dut.b_input = 0
dut.s_output_bit_b = 0xFFFFFFFF
dut.a_input_ring_bit_b = 0x00000000
dut.a_input_ext_bit_b = 0xFFFFFFFF
dut.control_b = 1
dut.bypass_b = 0
await ClockCycles(dut.clk, 2)
dut.stop_b = 1
await ClockCycles(dut.clk, 10)
@cocotb.test()
async def test_control_minimal(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
dut.reset = 1
dut.stop_b = 0
dut.extra_inverter = 1
dut.a_input = 0
dut.b_input = 0
dut.s_output_bit_b = 0xFFFFFFFF
dut.a_input_ring_bit_b = 0x00000000
dut.a_input_ext_bit_b = 0xFFFFFFFF
dut.control_b = 0
dut.bypass_b = 1
await ClockCycles(dut.clk, 2)
dut.stop_b = 1
await ClockCycles(dut.clk, 10)
# for spice
@cocotb.test()
async def test_adder_minimal(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
dut.reset = 1
dut.stop_b = 0
dut.extra_inverter = 1
dut.a_input = 0
dut.b_input = 0
dut.s_output_bit_b = 0xFFFFFFFE
dut.a_input_ring_bit_b = 0xFFFFFFFE
dut.a_input_ext_bit_b = 0x00000001
dut.control_b = 1
dut.bypass_b = 1
await ClockCycles(dut.clk, 2)
dut.stop_b = 1
await ClockCycles(dut.clk, 10)
@cocotb.test()
async def test_bypass(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
# hold in reset
dut.reset = 1
dut.force_count = 0
# stop the ring
dut.stop_b = 0
# enable extra inverter
dut.extra_inverter = 1
# set b input to be 0
dut.b_input = 0
# disable control loop
dut.control_b = 1
# enable bypass loop
dut.bypass_b = 0
# disable adder sum connection and inputs
dut.s_output_bit_b = 0xFFFFFFFF
dut.a_input_ring_bit_b = 0xFFFFFFFF
dut.a_input_ext_bit_b = 0xFFFFFFFF
await ClockCycles(dut.clk, 3)
# load the integration counter
dut.integration_time = 100
dut.counter_load = 1
dut.reset = 0
await ClockCycles(dut.clk, 1)
dut.counter_load = 0
# start the loop
dut.stop_b = 1
dut.counter_enable = 1
await RisingEdge(dut.done)
count = int(dut.ring_osc_counter_out.value)
await ClockCycles(dut.clk, 5)
print("cycles : %d" % count)
assert count == 80
@cocotb.test()
async def test_control(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
# hold in reset
dut.reset = 1
dut.force_count = 0
# stop the ring
dut.stop_b = 0
# enable extra inverter
dut.extra_inverter = 1
# set b input to be 0
dut.b_input = 0
# enable control loop
dut.control_b = 0
# disable bypass loop
dut.bypass_b = 1
# disable adder sum connection and inputs
dut.s_output_bit_b = 0xFFFFFFFF
dut.a_input_ring_bit_b = 0xFFFFFFFF
dut.a_input_ext_bit_b = 0xFFFFFFFF
await ClockCycles(dut.clk, 3)
# load the integration counter
dut.integration_time = 100
dut.counter_load = 1
dut.reset = 0
await ClockCycles(dut.clk, 1)
dut.counter_load = 0
# start the loop
dut.stop_b = 1
dut.counter_enable = 1
await RisingEdge(dut.done)
count = int(dut.ring_osc_counter_out.value)
await ClockCycles(dut.clk, 5)
print("cycles : %d" % count)
assert count == 71
@cocotb.test()
async def test_adder_in_loop(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
for test_bit in range(32):
# hold in reset
dut.reset = 1
dut.force_count = 0
# stop the ring
dut.stop_b = 0
# enable extra inverter now adder is in the loop and b input is set to 0
dut.extra_inverter = 1
# set b input to be 0
dut.b_input = 0x00000000
# disable control loop
dut.control_b = 1
# disable bypass loop
dut.bypass_b = 1
# enable correct bit of adder, keep external a input disabled
dut.s_output_bit_b = 0xFFFFFFFF ^ 1 << test_bit
dut.a_input_ring_bit_b = 0xFFFFFFFF ^ 1 << test_bit
dut.a_input_ext_bit_b = 1 << test_bit
dut.a_input = 0
await ClockCycles(dut.clk, 3)
# load the integration counter
dut.integration_time = 100
dut.counter_load = 1
dut.reset = 0
await ClockCycles(dut.clk, 1)
dut.counter_load = 0
# start the loop
dut.stop_b = 1
dut.counter_enable = 1
await RisingEdge(dut.done)
count = int(dut.ring_osc_counter_out.value)
await ClockCycles(dut.clk, 5)
print("cycles : %d" % count)
# hack to handle if its the behavioral adder or one of the 1 cycle adders
assert(count == 30 or count == 80)
# constrained random
@cocotb.test()
async def test_adder(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
dut.force_count = 0
dut.reset = 1
dut.stop_b = 0
# control inputs are all inverted
dut.a_input_ext_bit_b = 0x00000000
dut.a_input_ring_bit_b = 0xFFFFFFFF
dut.s_output_bit_b = 0x00000000
await ClockCycles(dut.clk, 2)
num_tests = 10000
with Progress() as progress:
test_progress = progress.add_task("[green]Processing...", total=num_tests)
for test in range(num_tests):
a = random.randint(0, 0xFFFFFFF)
b = random.randint(0, 0xFFFFFFF)
dut.a_input = a
dut.b_input = b
await ClockCycles(dut.clk, 1)
assert (int(dut.sum_out) == (a+b))
progress.update(test_progress, advance=1)
@cocotb.test()
async def force_ring(dut):
clock = Clock(dut.clk, 100, units="ns")
cocotb.fork(clock.start())
dut.reset = 0
dut.force_count = 1
dut.stop_b = 1
dut.extra_inverter = 1
dut.a_input = 0
dut.b_input = 0
dut.s_output_bit_b = 0xFFFFFFFF
dut.a_input_ring_bit_b = 0x00000000
dut.a_input_ext_bit_b = 0xFFFFFFFF
dut.control_b = 1
dut.bypass_b = 0
await ClockCycles(dut.clk, 20)