Math Logic Commands

Overview

The custom logic editor uses the following math commands:

• ON_ADD

• ON_SUB

• ON_MUL

• ON_DIV

ON_ADD

The ON_ADD command performs unsigned addition when the 1-bit accumulator transitions from 0 to 1. It adds the value from Argument 1 to the 16-bit accumulator value, then posts the result back to the value in Argument 1.

Status register:

• Indicates an overflow if the result of the addition process exceeds 65,535

• Indicates the status of the 1-bit-accumulator from the previous scan

ON_SUB

The ON_SUB command performs unsigned subtraction when the 1-bit accumulator transitions from 0 to 1. It subtracts the 16-bit accumulator value from the value in Argument 1, then posts the result back to the value in Argument 1.

Status register:

• Indicates an underflow if the result of the subtraction process is less than 0

• Indicates the status of the 1-bit-accumulator from the previous scan

ON_MUL

The ON_MUL command performs unsigned multiplication when the 1-bit accumulator transitions from 0 to 1. The ON_MUL procedure multiplies the value from Argument 2 against the 16-bit accumulator value, then posts the result back to Argument 1 (most significant word) and Argument 2 (least significant word).

Status register indicates the status of the 1-bit accumulator from the previous scan.

ON_DIV

The ON_DIV command performs unsigned division when the 1-bit accumulator transitions from 0 to 1. The ON_DIV procedure divides the combined value of Argument 1 and Argument 2 by the 16-bit accumulator value, then posts the result back to Argument 1 (most significant word) and Argument 2 (least significant word).

Status register indicates:

• An overflow if division is by 0

• The status of the 1-bit accumulator from the previous scan