SELECTIVE MISR DATA ACCUMULATION DURING EXCEPTION PROCESSING

摘要

A plurality of test points are located at predetermined circuit nodes in a processing system. Test code which includes a set of software-controllable interrupts is executed using a multiple input shift register (MISR) to generate a MISR signature. One or more selected software-controllable interrupt types are determined. During execution of the test code, the MISR is used to also accumulate data values from the plurality of test points during exception processing of one or more of the software-controllable interrupts within the set of software-controllable interrupts which are of the one or more selected software-controllable interrupt types to generate the MISR signature. A test control register has a plurality of fields, each for selecting or not selecting a corresponding software-controllable interrupt type.