Signals activate as follows:
* When issue is first raised, a busy signal is sent out.
- The src1 and src2 registers and the operand can be latched in
- at this point
+ The operand can be latched in at this point.
+
+* Issue will only be raised for one cycle. Read requests may
+ go out immediately after issue goes low.
* Read request is set, which is acknowledged through the Scoreboard
to the priority picker, which generates (one and only one) Go_Read