Patent · US Expired

Boundary-scan enable cell with non-critical enable path

US5347520A · kind A · utility

9Cited by
4References
3Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 18, 1991
Grant dateSep 13, 1994
Priority date—
Expiry dateSep 18, 2011

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01R31/318541
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A boundary-scan enable cell which includes critical and non-critical enable paths without adding an extra layer of logic. The boundary-scan cell includes a multiplexer, a critical enable path which transmits critical enable terms coupled to a first multiplexer input, a sampling circuit which transmits non-critical terms coupled to a second multiplexer input, and a non-critical term path which transmits non-critical masking terms, coupled to the shift input of the multiplexer. Non-critical terms at the shift input are mimicked at the second input. Provision is also made for a test control circuit and a circuit for monitoring critical and non-critical terms.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.