name, return a tuple of:
* how the decoder should determine whether the Function Unit needs
- a Regport or not
- * which Regfile port should be read to get that data
- * when it comes to writing: likewise, which Regfile port should be written
+ access to a given Regport or not
+ * which Regfile number on that port should be read to get that data
+ * when it comes to writing: likewise, which Regfile num should be written
Note that some of the port numbering encoding is *unary*. in the case
of "Full Condition Register", it's a full 8-bit mask of read/write-enables.