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[fi] Add ChipShouter support #393

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af96977
[fi] Add ChipShouter support
nasahlpa Mar 11, 2025
af2a1ab
[fi] Optimize XY parameter generation
nasahlpa Mar 23, 2025
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58 changes: 58 additions & 0 deletions doc/chipshouter.md
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# EMFI Setup

ot-sca supports EMFI with the ChipShouter + ChipWhisperer Husky + ChipShover XZY table.

## Setup

To perform electromagnetic fault injection evaluations with ot-sca, you need to setup the gear as following:

![](img/chipshouter_setup.png)

* [ChipShouter](https://www.newae.com/products/nae-cw520)
* Injects the electromagnetic pulse into the DUT (i.e., the CW310 FPGA board or the chip)
* Configured by the ot-sca framework to receive a pulse at the hardware trigger (SMB) input from the ChipWhisperer Husky
* Electromagnetic pulse is based on the received pulse from the Husky
* [ChipShover](https://github.com/newaetech/ChipShover)
* Moves the XZY position of the ChipShouter
* Configured & controlled by ot-sca
* [ChipWhisperer Husky](https://www.newae.com/products/nae-cwhusky)
* Configured & controlled by ot-sca
* Receives trigger signal from DUT
* Generates pulse at the Trigger/Glitch out SMB output
* Forwarded to the ChipShouter input

![](img/cs_setup.jpg)

The picture above shows the entire setup.
By connecting the Husky Trigger/Glitch out (SMB) port to the ChipShouter hardware trigger (SMB), the pulse is forwarded from the Husky to the ChipShouter.
The DUT trigger is connected to the ChipWhisperer Husky IO4 port.

## Electromagnetic Pulse Generation

The ChipShouter is configured by the ot-sca framework to receive a pulse at the hardware trigger (SMB) input that is generated by the ChipWhisperer Husky at the Trigger/Glitch out (SMB) output.
Internally, the ChipShouter shapes the electromagnetic pulse based on this received pulse.

To allow fine adjustment steps, the pulse is generated at the HS2 output of the ChipWhisperer Husky.
```python
self.cwh.clock.clkgen_freq = 50e6
self.cwh.glitch.output = 'enable_only'
self.cwh.glitch.repeat = <width>
self.cwh.glitch.ext_offset = <offset>
```
The code snippet above shows the glitch width configuration.
When using the `enable_only` mode, the minimum glitch length as well as the minimum glitch step width is the `clkgen_freq`, i.e., `20ns`.
The glitch width can be configured with the `repeat` setting.
By setting this parameter to 5, the glitch width is `5 * 20ns = 100ns`.
Similar, to configure the trigger delay, set the `ext_offset`, i.e., a glitch offset of 10 means `10 * 20ns = 200ns`.

The electromagnetic pulse voltage is directly set in the ChipShouter over the serial interface.

## Timing Diagram

![](img/chipshouter_trigger.png)

The timing diagram above shows the trigger signal generated by the DUT (yellow), the pulse generated by the Husky (red) and the electromagnetic pulse generated by the ChipShouter (blue).

When detecting the rising edge of the DUT trigger signal, the Huksy waits for `trigger_delay` ns before sending the pules out of the HS2 output port.

Please note that the ChipWhisperer Husky as well as the ChipShouter has a small latency, i.e., even with a `trigger_delay = 0ns`, the electromagnetic pulse is not injected immediately.
194 changes: 194 additions & 0 deletions doc/img/chipshouter_setup.drawio
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3 changes: 3 additions & 0 deletions doc/img/chipshouter_setup.png
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3 changes: 3 additions & 0 deletions doc/img/chipshouter_trigger.png
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3 changes: 3 additions & 0 deletions doc/img/cs_setup.jpg
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