Add LVDS instructions

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

src/SUMMARY.md

@@ -17,6 +17,7 @@
   - [Sinara 8452 DSP Stabilizer](./hw/stabilizer.md)
   - [Sinara 9805 RF Power Amplifier Booster](./hw/booster.md)
   - [Sinara 8451 Thermostat](./hw/thermostat.md)
+  - [Sinara 2245 LVDS DIO](./hw/lvds_dio.md)
 - [Software/Support](./sw_sup/software_support.md)
   - [Building legacy firmware](./sw_sup/artiq_legacy.md)
   - [Networking](./sw_sup/networking.md)

src/hw/lvds_dio.md

@@ -0,0 +1,38 @@
+# Sinara 2245 LVDS DIO card
+
+* [Wiki](https://github.com/sinara-hw/DIO_LVDS_RJ45/wiki)
+* [Datasheet](https://m-labs.hk/docs/sinara-datasheets/2245.pdf)
+
+## JSON
+
+Be aware of the reversed EEM order on the card:
+
+```json
+[
+  {
+    "type": "dio",
+    "board": "DIO_LVDS",
+    "ports": [1],
+    "bank_direction_low": "input",
+    "bank_direction_high": "input",
+    "edge_counter": false // or true
+  }, 
+  {
+    "type": "dio",
+    "board": "DIO_LVDS",
+    "ports": [0],
+    "bank_direction_low": "output",
+    "bank_direction_high": "output"
+  }
+]
+```
+
+## Setup
+
+Switch DIPs in required position per each channel individually. Each RJ45 have 4 channels.
+
+## Testing
+
+You can test channels by connecting Ethernet RJ45 cable. Since the artiq_sinara_tester allows to choose only one DIO
+port, you will need to run the test 4 times and choose different output source and track that every 4th is passing the test. 
+It is also incompatible with other TTL cards, so you will need to use same or other LVDS card for proper testing.