Method and apparatus for generating control signals

Details Method and apparatus for generating control signals Method and apparatus for generating control signals

1989-08-28

1991-09-10

Smith, Jerry

Excavating

H04B 1700

Patent

active

050480219

ABSTRACT:
A method is disclosed for generating a control signal (TMS) which may be used to control the test activity of boundary scan system (10). The method is initiated by loading a multi-bit control macro (STI, DTI or DSTI) into a register (38) whose output is coupled back to its input. After loading of the macro, its identity is ascertained by a macro controller (42) which serves to decode a multi-bit signal (IT) whose state is indicative of the macro type. The macro controller (42) actuates the register to shift out the bits of the control macro in a sequence dependent on the macro's identity in order to generate the appropriate control signal. As each bit is shifted out, it is shifted back into the register so as to allow the same sequence of bits to be repeatedly shifted out.

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IEEE P1149.1 Standard Test Access Port and Boundary Scan Architecture Standard Proposal (draft Jun. 20, 1989).

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