Configuration for generating signal impulses of defined lengths in a module with a bist-function

Abstract

In a module with a BIST function to which signal pulses are fed from outside with a tester, a configuration for generating signal impulses of defined lengths includes registers configured to store measured pulse lengths, and a variable delay element configured to measure pulse lengths of externally supplied signal pulses in a training phase. The element has a series circuit of inverters and delay-free signal paths parallel thereto for read/write from/into the registers. AND gates are disposed between a delay-free write signal path and the element and behind an even number of respective inverters, and the output of the AND gates are connected to the registers through the decoder. AND gates are disposed between the delay-free read signal path and the element and behind an even number of respective inverters. One input of the AND gates is connected to the registers through the decoder, another input is connected to the element, and the outputs are connected to the delay-free read signal path.

Dependencies are inferred from the claim text.