The subject application is directed to a system and method for employing an extended boundary lookup table. A table of data elements in each of N addressable locations is first stored, with the value stored in the Nth location replicated in a terminus data element storage location. Address data representative of address locations in the table is then received and used to retrieve a first data point and a second data point, where the first data point and the second data point are located in consecutive addresses in the table. The data points are then communicated to an interpolator. When the first data point corresponds to the Nth storage location, the second data point corresponds to the terminus data element storage location.