# Simple testbench fails at time zero in Riviera with "Delta Overflow" error message

**URL:** <https://forum.uvvm.org/t/simple-testbench-fails-at-time-zero-in-riviera-with-delta-overflow-error-message/518>\
**Category:** Uncategorized\
**Created:** [September 17, 2026, 10:06pm UTC](https://forum.uvvm.org/t/simple-testbench-fails-at-time-zero-in-riviera-with-delta-overflow-error-message/518 "2026-09-17T22:06:47Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![CharlesGardiner](https://avatars.discourse-cdn.com/v4/letter/c/e495f1/32.png) [@CharlesGardiner](https://forum.uvvm.org/u/CharlesGardiner)\
**Post date:** [September 17, 2026, 10:06pm UTC](https://forum.uvvm.org/t/simple-testbench-fails-at-time-zero-in-riviera-with-delta-overflow-error-message/518/1 "2026-09-17T22:06:47Z")

</div>

A very simple testbench using four bitvis\_vip\_axi.axi\_vvc instances aborts a t time zero due to too many delta cycles, probably an infinite loop somewhere without a wait statement.

KERNEL: Stopped at time 0 ps + 5000.  
KERNEL: Error: KERNEL\_0160 Delta count overflow. Increase the iteration limit using -i argument for asim or the matching entry in simulation preferences.

The testbench doesn’t do anything (yet), I just want to check whether elaboration is successful (it is) and see that clock and reset run OK. The test process is:

process  
begin  
await\_uvvm\_initialization(VOID);

```auto
  insert_delay(AXI_VVCT,0 , 50 ns, "50 ns delay", C_SCOPE);
  insert_delay(AXI_VVCT,1 , 50 ns, "50 ns delay", C_SCOPE);
  insert_delay(AXI_VVCT,2 , 50 ns, "50 ns delay", C_SCOPE);
  insert_delay(AXI_VVCT,3 , 50 ns, "50 ns delay", C_SCOPE);

```

```auto
  wait;
end process;

```

---

<div class="post-metadata">

**Author:** ![CharlesGardiner](https://avatars.discourse-cdn.com/v4/letter/c/e495f1/32.png) [@CharlesGardiner](https://forum.uvvm.org/u/CharlesGardiner)\
**Post date:** [September 27, 2026, 9:34pm UTC](https://forum.uvvm.org/t/simple-testbench-fails-at-time-zero-in-riviera-with-delta-overflow-error-message/518/2 "2026-09-27T21:34:33Z")

</div>

Solved.

The ti\_uvvm\_engine wasn’t elaborated