> ## Documentation Index
> Fetch the complete documentation index at: https://docs.thrindex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# E0104 — NoNativeDelaySupport

> The target has no delay support and emulation is disabled.

<Warning>E0104: target has no native delay support and emulation is disabled</Warning>

## What happened

The model uses synaptic delays (`delays=True` on a Dense layer), but the compilation target declares `native_delay_max_steps=0` and `delay_fallback="reject"`. The target cannot implement delays at all, and no fallback is configured.

## Why

Some hardware backends do not implement delay registers. If a model requires delays and the target cannot handle them — neither natively nor by emulation — compilation must fail.

## How to fix

1. **Use the `sim` target**: `thx.compile(model, "model.thx", target="sim")`. The simulator emulates delays via ring buffers without limit.
2. **Remove delays from the model**: set `delays=False` (or do not specify `delays`) on Dense layers.
3. **Use a different hardware target** that supports delays.

## Example

```
E0104: target has no native delay support and emulation is disabled in layer 0
Why: this target's capability descriptor declares native_delay_max_steps=0 and delay_fallback="reject".
Fix: use the "sim" target (which emulates delays via ring buffers), or remove delays from the model.
Docs: https://docs.thrindex.com/errors/E0104
```