add Addresses documentaiton

diff --git a/documents/Addresses.md b/documents/Addresses.md
new file mode 100644 (file)
index 0000000..859c0c2
--- /dev/null
+++ b/documents/Addresses.md
@@ -0,0 +1,22 @@
+# Network Addresses
+
+## OEP FPGA
+
+    1. digit: 8 (as for all hubs)
+    2. digit: e/f (inner/outer MDC)
+    3. digit: 0..b (chamber number, 0..5 for MDC1/3 6..B for MDC2/4)
+    4. digit: 0..f (MBO number)
+
+## TDC FPGA
+
+    1. digit: 1/2 (inner/outer MDC)
+    2. digit: 0..b (chamber number, 0..5 for MDC1/3 6..B for MDC2/4)
+    3. digit: 0..f (MBO number)
+    4. digit: 0..2 (FPGA number)
+
+## Hub FPGA
+
+    1. digit: 8 (as for all hubs)
+    2. digit: 5
+    3. digit: 0..b (crate number, 0..5 inner MDC, 6..b outer MDC sectors)
+    4. digit FPGA number in crate (0:master & Subevent ID)