Address range comparison system using multiplexer for detection of range

Abstract

A digital comparison system and technique enables an easy determination of the digital range within which digital addresses or data may fall or be selected. In one embodiment, the entire memory or addres space is divided into a predetermined number of sections, and each section's location in memory is defined by a predetermined first number of digits of the address. Likewise each address within a section is defined by a second predetermined number of digits of the address. A digital identifier is assigned to each section to define the position of a section with respect to a desired range. Digital identifiers are also assigned to each address within a section to fix the end points within each section. The outputs from memory devices storing the identifiers are coupled through a multiplexer which allows the position of a selected address to be identified as inside, outside, or an end point of a predetermined range. When the selected address is an end point, the multiplexer provides an indication signifying that the end point is either the upper or lower end point of the range. The system allows an easy determination of any range by a simple adjustment of the identifiers coded in memory devices.