luh3: add

luh3.json

@@ -0,0 +1,28 @@
+{
+    "_description": "luh3 variant, formerly using ptb2",
+    "target": "kasli",
+    "variant": "luh3",
+    "hw_rev": "v1.1",
+    "base": "standalone",
+    "ext_ref_frequency": 100e6,
+    "core_addr": "10.34.16.100",
+    "vendor": "QUARTIQ",
+    "peripherals": [
+        {
+            "type": "dio",
+            "ports": [0],
+            "bank_direction_low": "input",
+            "bank_direction_high": "output"
+        },
+        {
+            "type": "urukul",
+            "ports": [
+                5,
+                4
+            ],
+            "dds": "ad9910",
+            "synchronization": true,
+            "clk_sel": 2
+        }
+   ]
+}