METHOD OF GENERATING TRIGGER SIGNAL AND WAVEFORM EXPRESSION

摘要

PURPOSE: The method of generating trigger signal and waveform expression are provided to enable a user of the memory tester to apply the scope mode to any pre-existing test programs without having to modify them to produce stable repetitions. CONSTITUTION: A method is composed of:(a) for each ALU hardware register in the plurality thereof, selecting any combination of bit positions, including none, that are to contribute to generating the trigger signal; (b) associating a separate trigger value register with each ALU hardware register; (c) for each trigger value register associated with an ALU hardware register that had at least one bit position selected in step (a), loading into those same bit positions that were selected the bit for bit value that the associated ALU hardware register is to have for the trigger signal to be generated; (d) for each trigger value register, selecting the same combination of bit positions that was selected in step (a) for the corresponding ALU hardware register; (e) for each pair of ALU hardware and associated trigger value registers, bit-wise comparing for equality the selected combination of ALU hardware bits with the selected combination of bits in the associated trigger value register; and (f) generating a trigger signal upon a determination that step (e) indicated equality.