add ustc4

ustc4.json

@@ -0,0 +1,44 @@
+{
+    "target": "kasli",
+    "min_artiq_version": "6.0",
+    "variant": "ustc4",
+    "hw_rev": "v2.0",
+    "base": "standalone",
+    "core_addr": "192.168.1.75",
+    "peripherals": [
+        {
+            "type": "dio",
+            "ports": [0],
+            "bank_direction_low": "input",
+            "bank_direction_high": "output"
+        },
+        {
+            "type": "dio",
+            "ports": [1],
+            "bank_direction_low": "output",
+            "bank_direction_high": "output"
+        },
+        {
+            "type": "suservo",
+            "sampler_ports": [2, 3],
+            "urukul0_ports": [4, 5],
+            "clk_sel": 2
+        },
+        {
+            "type": "urukul",
+            "dds": "ad9910",
+            "ports": [6, 7],
+            "clk_sel": 2
+        },
+        {
+            "type": "urukul",
+            "dds": "ad9910",
+            "ports": [8, 9],
+            "clk_sel": 2
+        },
+        {
+            "type": "fastino",
+            "ports": [10]
+        }
+   ]
+}