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Improve PTP model resolution by using Decimal types and wider internal fns accumulators

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich
2023-11-07 01:28:25 -08:00
parent c44f928bea
commit 7d8d214b57
4 changed files with 219 additions and 167 deletions
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35
tests/ptp_clock_sim_time/test_ptp_clock_sim_time.py
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@@ -25,6 +25,7 @@ THE SOFTWARE.
import logging
import os
from decimal import Decimal
import cocotb_test.simulator
@@ -52,6 +53,14 @@ class TB:
clock=dut.clk
)
def get_ts_tod_ns(self):
ts = self.dut.ts_tod.value.integer
return Decimal(ts >> 48).scaleb(9) + (Decimal(ts & 0xffffffffffff) / Decimal(2**16))
def get_ts_rel_ns(self):
ts = self.dut.ts_rel.value.integer
return Decimal(ts) / Decimal(2**16)
@cocotb.test()
async def run_test(dut):
@@ -62,32 +71,32 @@ async def run_test(dut):
await RisingEdge(dut.clk)
await RisingEdge(dut.clk)
start_time = get_sim_time('sec')
start_ts_tod = (dut.ts_tod.value.integer >> 48) + ((dut.ts_tod.value.integer & 0xffffffffffff)/2**16*1e-9)
start_ts_rel = dut.ts_rel.value.integer/2**16*1e-9
start_time = Decimal(get_sim_time('fs')).scaleb(-6)
start_ts_tod = tb.get_ts_tod_ns()
start_ts_rel = tb.get_ts_rel_ns()
await ClockCycles(dut.clk, 10000)
stop_time = get_sim_time('sec')
stop_ts_tod = (dut.ts_tod.value.integer >> 48) + ((dut.ts_tod.value.integer & 0xffffffffffff)/2**16*1e-9)
stop_ts_rel = dut.ts_rel.value.integer/2**16*1e-9
stop_time = Decimal(get_sim_time('fs')).scaleb(-6)
stop_ts_tod = tb.get_ts_tod_ns()
stop_ts_rel = tb.get_ts_rel_ns()
time_delta = stop_time-start_time
ts_tod_delta = stop_ts_tod-start_ts_tod
ts_rel_delta = stop_ts_rel-start_ts_rel
tb.log.info("sim time delta : %g s", time_delta)
tb.log.info("ToD ts delta : %g s", ts_tod_delta)
tb.log.info("rel ts delta : %g s", ts_rel_delta)
tb.log.info("sim time delta : %s ns", time_delta)
tb.log.info("ToD ts delta : %s ns", ts_tod_delta)
tb.log.info("rel ts delta : %s ns", ts_rel_delta)
ts_tod_diff = time_delta - ts_tod_delta
ts_rel_diff = time_delta - ts_rel_delta
tb.log.info("ToD ts diff : %g s", ts_tod_diff)
tb.log.info("rel ts diff : %g s", ts_rel_diff)
tb.log.info("ToD ts diff : %s ns", ts_tod_diff)
tb.log.info("rel ts diff : %s ns", ts_rel_diff)
assert abs(ts_tod_diff) < 1e-12
assert abs(ts_rel_diff) < 1e-12
assert abs(ts_tod_diff) < 1e-3
assert abs(ts_rel_diff) < 1e-3
await RisingEdge(dut.clk)
await RisingEdge(dut.clk)