+----------------+-----------------+
|       0        | Data Block Code |
|                |   (RLD = 4)     |
+----------------+-----------------+
|  Displacement  |   Command       |
+----------------+-----------------+
|  Information   |   Information   |
+----------------+-----------------+
|  Information   |   Information   |
+----------------+-----------------+
|  Information   |   Information   |
+----------------+-----------------+
.                                  .
.                                  .
.                                  .
+----------------+-----------------+
|  Command       |  Information    |
+----------------+-----------------+
|  Information   |  Displacement   |
+----------------+-----------------+
|  Information   |  Information    |
+----------------+-----------------+
|  Information   |  Information    |
+----------------+-----------------+
|  Information   |  Information    |
+----------------+-----------------+
|  Displacement  |  Command        |
+----------------+-----------------+
|  Information   |  Information    |
+----------------+-----------------+
|  Information   |  Information    |
+----------------+-----------------+
|  Information   |  Information    |
+----------------+-----------------+