All Packages  Class Hierarchy  This Package  Previous  Next  Index

Interface duckMachine.architecture.ALUI

public interface ALUI
The specification of the arithmetic and logic unit of the machine.

Method Index

o add(Word, Word)
o compare(Word, Word)
Sets the condition flags according to the result of comparing w1 and w2.
If w1>w2 then GT should be set and the other flags made FALSE.
If w1=w2 then EQ should be set and the other flags made FALSE.
If w1>w2 then LT should be set and the other flags made FALSE.
o dec(Word)
o fetchEQ()
Returns the current contents of the EQ flag.
o fetchGT()
Returns the current contents of the GT flag.
o fetchLT()
Returns the current contents of the LT flag.
o inc(Word)
o sub(Word, Word)

Methods

o fetchGT 
 public abstract boolean fetchGT()
Returns the current contents of the GT flag.

o fetchEQ 
 public abstract boolean fetchEQ()
Returns the current contents of the EQ flag.

o fetchLT 
 public abstract boolean fetchLT()
Returns the current contents of the LT flag.

o add 
 public abstract Word add(Word w1,
                          Word w2)
o sub 
 public abstract Word sub(Word w1,
                          Word w2)
o inc 
 public abstract Word inc(Word w)
o dec 
 public abstract Word dec(Word w)
o compare 
 public abstract void compare(Word w1,
                              Word w2)
Sets the condition flags according to the result of comparing w1 and w2.
If w1>w2 then GT should be set and the other flags made FALSE.
If w1=w2 then EQ should be set and the other flags made FALSE.
If w1>w2 then LT should be set and the other flags made FALSE.

All Packages  Class Hierarchy  This Package  Previous  Next  Index