make new lab (#232)

Author: jameshughes89

site/index.rst

@@ -104,6 +104,7 @@ Office Hours
     labs/arithmetic-logic/arithmetic-logic
     labs/comparisons/comparisons
     labs/decoding-instructions/decoding-instructions
+    labs/decoding-instructions/decoding-instructions-registers
 
 
 

site/labs/decoding-instructions/decoding-instructions-registers.rst

@@ -0,0 +1,54 @@
+*****************************************
+Bit Patterns, Instructions, and Registers
+*****************************************
+
+* Feel free to use your laptop
+* You are strongly encourage to work with others
+
+    * When you get stuck, ask those sitting around you for help
+    * Get used to working together in the labs
+    * Peer teaching and peer learning has been empirically shown to be very effective
+
+
+For these questions, feel free to use a single Digital workspace for all the circuits. However, label each circuit with
+labelled rectangles. These are components that can be found under **Components -> Misc. -> Decoration -> Rectangle**.
+
+Where possible, each question should have complete tests. The test component can be found under
+**Components -> Misc. -> Test case**. Once a test component is placed on the workspace, right click on the component to
+edit the test data.
+
+Questions may have restrictions on the logic gates that may be used. When restrictions are stated, they only apply to
+the gates; inputs, outputs, wires, etc. may be still be used.
+
+
+Prepare
+=======
+
+#. If not already completed, finish the design from the previous lab
+
+
+
+Registers
+=========
+
+#. Modify the design such that the values do not come from 8 bit inputs, but from registers
+
+    * This will be similar to assignment 3
+    * The updated design should include eight 8 bit registers
+    * Two sets of 3 bit values will be used to specify the two registers the values should be retrieved from
+    * The design will have 1 output
+    * This new design will have a total of 10 inputs
+
+        * One 1 bit input specifying ALU or comparator
+        * One set of 3 bit inputs specifying an operator
+        * Two sets of 3 bit inputs specifying the sources of the two inputs to the ALU/comparator
+
+
+#. Modify the design such that the result is not only output, but saved to a specified register
+
+    * This design will have 1 output
+    * This design will have 13 inputs
+
+        * The same 10 inputs discussed above
+        * An additional 3 inputs specifying which register the output should be saved to
+