Option decoding with on-chip electrical fuses

Details Option decoding with on-chip electrical fuses Option decoding with on-chip electrical fuses

1996-04-30

1998-10-13

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

326 45, 326 50, 327525, H03K 19173, H01H 8502

Patent

active

058217703

ABSTRACT:
A method for varying the type of function selected on a chip (for example, after completion of manufacturing) may include the steps of providing predetermined fuse arrangements which individually or in combination correspond to each type of function on the chip and providing disable control lines having fuses to each of the predetermined fuse arrangements. When one of the types of circuits is selected, the predetermined fuse arrangement individually or in combination corresponding to that selected type of function is blown. The blowing of fuses may change the functionality of the chip directly or may perform a complex procedure such as controlling a portion of a decoding scheme which may radically change the function of the chip. To prevent further blowing of predetermined fuse arrangements, the fuses in disable control lines to each of the predetermined fuse arrangements may be blown, eliminating further selection of types of function.

REFERENCES:
patent: 4689494 (1987-08-01), Chen et al.
patent: 4887239 (1989-12-01), Turner
patent: 5309394 (1994-05-01), Wuertz et al.
patent: 5508638 (1996-04-01), Cowles et al.
patent: 5629635 (1997-05-01), Reno
Mano, Computer Engineering: Hardware Design. Prentice Hall, NJ. 1988. pp. 205-207.

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