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tb: phy_core: Fix col/crs detection 

Detecting non-clock signal edges with RisingEdge and FallingEdge is not
very robust, and is recommended against. Track edges manually.

Fixes: f6f3f02 ("Add phy_core")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Sean Anderson 2023-01-09 20:50:00 -05:00
parent aa4ccf07c0
commit fb588994b7
1 changed files with 10 additions and 6 deletions
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16
tb/phy_core.py
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@ -142,17 +142,21 @@ async def test_transfer(phy):
async def count_crs(): async def count_crs():
nonlocal crs nonlocal crs
last_crs = 0
while True: while True:
await RisingEdge(phy.crs) await RisingEdge(phy.clk)
crs += 1 if phy.crs.value and not last_crs:
await FallingEdge(phy.crs) crs += 1
last_crs = phy.crs.value
async def count_col(): async def count_col():
nonlocal col nonlocal col
last_col = 0
while True: while True:
await RisingEdge(phy.col) await RisingEdge(phy.clk)
col += 1 if phy.col.value and not last_col:
await FallingEdge(phy.col) col += 1
last_col = phy.col.value
await cocotb.start(count_crs()) await cocotb.start(count_crs())
await cocotb.start(count_col()) await cocotb.start(count_col())