Structure and method for multiplexing pins for in-system program

Details Structure and method for multiplexing pins for in-system program Structure and method for multiplexing pins for in-system program

1993-08-13

1994-08-09

Hudspeth, David R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307469, H03K 19177

Patent

active

053369513

ABSTRACT:
A structure and method for in-system programming of a programmable logic device are provided. The in-system programming structure provides one dedicated pin for in-system programming function, additional in-system programming pins are multiplexed with programmable input/output pins used in functional operations. When an enable signal is received at the dedicated pin, the multiplexed pins relinquish their roles as programmable input/output pin to become in-system programming pins. A state machine controls the programming steps. The in-system programming structure can be cascaded in a "daisy chain" fashion.

REFERENCES:
patent: 4918641 (1990-04-01), Jigour et al.
patent: 4975601 (1990-12-01), Steele
patent: 4987325 (1991-01-01), Seo
patent: 4990800 (1991-02-01), Lee
patent: 5001368 (1991-03-01), Cliff et al.
patent: 5023484 (1991-06-01), Pathak et al.
patent: 5023606 (1991-06-01), Kaplinsky

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