Output pin for selectively outputting one of a plurality of sign

Details Output pin for selectively outputting one of a plurality of sign Output pin for selectively outputting one of a plurality of sign

1995-12-04

1998-02-10

Nguyen, Hoa T.

Excavating

326 39, 371 222, G11C 2900, G01R 3128, H03K 19003

Patent

active

057176957

ABSTRACT:
A method of gaining access to multiple signals internal to a semiconductor chip while minimizing the number of pins dedicated for diagnostic and testing purposes. A chip designer determines which internal signals would most likely be helpful in troubleshooting and debugging a new chip design. These signals are input to a selector. A configuration register is loaded with information specifying which ones of these signals is to be routed to the output pin(s) so that they can be monitored externally by a logic analyzer in real-time. The selector only routes the currently designated signals to the appropriate output pin(s). Subsequently, a different set of signals can be selectively routed to the output pin(s) in place of the originally chosen signals.

REFERENCES:
patent: 4670879 (1987-06-01), Okino
patent: 5381421 (1995-01-01), Dickol et al.
patent: 5412260 (1995-05-01), Tsui et al.
patent: 5517659 (1996-05-01), Bourekas et al.

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