Test Methodology for Multiple Clocks Single Capture Scan Design based on JTAG IEEE1149.1 Standard

IEEE 1149.1 표준에 근거한 다중 클럭을 이용한 단일 캡쳐 스캔 설계에 적용되는 경계 주사 테스트 기법에 관한 연구

  • 김인수 (성균관대학교 정보통신공학부) ;
  • 민형복 (성균관대학교 정보통신공학부)
  • Published : 2007.05.01

Abstract

Boundary scan test structure(JTAG IEEE 1149.1 standard) that supports an internal scan chain is generally being used to test CUT(circuit under test). Since the internal scan chain can only have a single scan-in port and a single scan-out port; however, existing boundary test methods can not be used when multiple scan chains are present in CUT. Those chains must be stitched to form a single scan chain as shown in this paper. We propose an efficient boundary scan test structure that adds a circuit called Clock Group Register(CGR) for multiple clocks testing within the design of multiple scan chains. The proposed CGR has the function of grouping clocks. By adding CGR to a previously existing boundary scan design, the design is modified. This revised scan design overcomes the limitation of supporting a single scan-in port and out port, and it bolsters multiple scan-in ports and out ports. Through our experiments, the effectiveness of CGR is proved. With this, it is possible to test more complicated designs that have high density with a little effort. Furthermore, it will also benefit in designing those complicated circuits.

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