Patent ID: 6795948
Filing Date: 2004-09-21
Classification: G01R

Abstract:
An apparatus, comprising:a die having an integrated circuit, the integrated circuit having â€œmâ€  scan chains, each scan chain to be scanned having â€œpâ€  scan cells, the die having: a weighted random pattern generator on the die, the weighted random pattern generator having: a pseudo-random pattern generator to generate pseudo-random binary bits; a memory to store m*p multi-bit vectors, the vectors to determine weights to be applied to the pseudo-random binary bits; set of weighted pseudo-random bit generators corresponding to the set of scan chains; circuitry to retrieve the weights from memory and to distribute the weights to the set of weighted pseudo-random bit generators, the weighted pseudo-random bit generators to apply the weights to the pseudo-random binary bits to generate weighted pseudo-random bits; and a controller to control the retrieval and distribution of the weights.