Circuit for partially reprogramming an operational programmable

Details Circuit for partially reprogramming an operational programmable Circuit for partially reprogramming an operational programmable

1996-06-26

1998-06-09

Hudspeth, David R.

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

326 39, 326 40, H03K 19177

Patent

active

057640769

ABSTRACT:
A complex programmable logic device (PLD) that includes a number of programmable function blocks and an instruction bus for receiving programming instructions. The programming instructions are used to program the function blocks to enable the PLD to perform one or more desired logic functions. The PLD also includes an instruction-blocking circuit that is connected to each of the functional blocks. When directed by a user, the instruction blocking circuit selectively blocks programming instructions on the instruction bus from one or more of the function blocks while allowing the other function blocks to receive the programming instructions. Thus, one or more function blocks in the PLD are reprogrammed without interrupting the operation of the remaining function blocks.

REFERENCES:
patent: 5448186 (1995-09-01), Kawata
patent: 5550782 (1996-08-01), Cliff et al.
patent: 5623217 (1997-04-01), Britton et al.
patent: 5654650 (1997-08-01), Gissel
"The Programmable Logic Data Book", 1994, pp. 3-2 through 3-90, available from Xilinx, Inc., 2100 Logic Drive, San Jose, CA 95124.

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