Add Stabilizer instructions

Signed-off-by: Egor Savkin <es@m-labs.hk>

src/SUMMARY.md

@@ -12,3 +12,4 @@
   - [Sinara 5108 Sampler](./hw/sampler.md)
   - [Sinara 6302 Grabber](./hw/grabber.md)
   - [Sinara 7210 Clocker](./hw/clocker.md)
+  - [Sinara 8452 DSP Stabilizer](./hw/stabilizer.md)

src/hw/stabilizer.md

@@ -0,0 +1,21 @@
+# Sinara 8452 DSP Stabilizer
+
+[Wiki](https://github.com/sinara-hw/Stabilizer/wiki)
+[QUARTIQ Manual](https://quartiq.de/stabilizer/)
+
+## JSON
+
+No JSON modifications required.
+
+## Testing
+
+1. Ensure that the [firmware](https://github.com/quartiq/stabilizer) has been flashed onto the Stabilizer
+2. Turn on the crate/Stabilizer
+3. Set up the signal generator for an amplitude of 1V, frequency of 10kHz, and a sine wave
+4. Use the splitter to connect the generator's output to ADC0 and to the oscilloscope (refer to the picture below)
+   ![](../img/stabilizer_signal_generator.jpg)
+5. Configure the oscilloscope so that the sine wave is clearly visible
+6. Connect the second channel of the oscilloscope to the Stabilizer's DAC0
+7. Ensure that there is the same wave on the second channel, with a small delay, as on the first channel
+8. Repeat steps 4-7 for ADC/DAC1 (refer to the picture below for connection reference)
+   ![](../img/stabilizer_ports_match.jpg)