Abstract:

With the wide application of IP cores in the system on the chip,more and more interconnection bus has been used in the IP cores,leading to the problem of the signal dis-integrity.And the traditional serial scanning topology structure cannot satisfy the requirements of the development task of the test system.The IEEE 1149.1 standard proposed a TAP.7 interface standard that supports three topology structures.This paper gives a test method for the interconnected signal integrity based on CJTAG with emphasis on the design of the TAP.7 interface converter.Testing results show that this system has good application prospects.

Key words: serial scanning;CJTAG;TAP.7 interface;signal integrity