[otbn,iss] Fix URND ISS vs RTL timing
Due to a recent functional change RTL URND was one step ahead of ISS.
This fixes it so they remain in sync.
Fixes #12563
Signed-off-by: Greg Chadwick <gac@lowrisc.org>
diff --git a/hw/ip/otbn/dv/otbnsim/sim/wsr.py b/hw/ip/otbn/dv/otbnsim/sim/wsr.py
index 9049479..1b2a889 100644
--- a/hw/ip/otbn/dv/otbnsim/sim/wsr.py
+++ b/hw/ip/otbn/dv/otbnsim/sim/wsr.py
@@ -228,6 +228,8 @@
def set_seed(self, value: List[int]) -> None:
self.running = True
self.state[0] = value
+ # Step immediately to update the internal state with the new seed
+ self.step()
def step(self) -> None:
if self.running:
