Bit Logic Instructions

Overview of Bit Logic Instructions

Description

Bit logic instructions work with two digits, 1 and 0. These two digits form the base

of a number system called the binary system. The two digits 1 and 0 are called

binary digits or bits. In conjunction with AND, OR, XOR and outputs, a 1 stands for

logical YES and a 0 for logical NO.

The bit logic instructions interpret signal states of 1 and 0 and combine them

according to Boolean logic. These combinations produce a result of 1 or 0 that is

called the “result of logic operation” (RLO).

There are bit logic instructions to perform the following functions:

•

AND, OR and Exclusive OR: these instructions check the signal state and

produce a result that is either copied to the RLO bit or combined with it.

•

AND-before-OR Logic Operation and OR-before-AND Logic Operation

•

Assign and Midline Output. these instructions assign the RLO or store it

temporarily.

The following instructions react to an RLO of 1:

•

S : Set Output

•

R : Reset Output

•

SR : Set_Reset Flip Flop

•

RS : Reset_Set Flip Flop

Other instructions react to a positive or negative edge transition to perform the

following functions:

•

N : Negative RLO Edge Detection

•

P : Positive RLO Edge Detection

•

NEG : Address Negative Edge Detection

•

POS : Address Positive Edge Detection

The remaining instructions affect the RLO directly in the following ways:

•

Insert Binary Input

•

Negate Binary Input

• SAVE : Save RLO to BR Memory