Method of altering a bitstream

Details Method of altering a bitstream Method of altering a bitstream

2007-10-02

2007-10-02

Chiang, Jack (Department: 2825)

Computer-aided design and analysis of circuits and semiconductor

Nanotechnology related integrated circuit design

Reexamination Certificate

active

10820337

ABSTRACT:
A method is disclosed for redeploying an FPGA that has been restricted for use with a first design. The FPGA accepts only those configuration bitstreams whose CRC checksums match a value stored on the FPGA. The restricted FPGA is used with a second configuration bitstream for a second design by altering the second configuration bitstream so that it generates a CRC checksum that matches the value stored on the FPGA. The first checksum is derived by applying a CRC hash function to the first configuration bitstream. The second configuration bitstream is altered so that the second checksum generated when the CRC hash function is applied to the altered second configuration bitstream is identical to the first checksum. Altering the second configuration bitstream can result in an altered second configuration bitstream that is either longer than or the same length as the second configuration bitstream.

REFERENCES:
patent: 5361266 (1994-11-01), Kodama et al.
patent: 5577053 (1996-11-01), Dent
patent: 5933023 (1999-08-01), Young
patent: 5946478 (1999-08-01), Lawman
patent: 5978814 (1999-11-01), Miller et al.
patent: 6034958 (2000-03-01), Wicklund
patent: 6654889 (2003-11-01), Trimberger
U.S. Appl. No. 09/724,652, filed Nov. 28, 2000, Pang et al.
U.S. Appl. No. 10/199,535, filed Jul. 18, 2002, Trimberger.
U.S. Appl. No. 10/112,838, filed Mar. 29, 2002, Trimberger.
U.S. Appl. No. 10/104,324, filed Mar. 22, 2002, Wells et al.
Bruce Schneier, “Applied Cryptography: Protocols, Algorithms and Source Code in C” 1996, pp. 456-459, Second Edition, available from John Wiley & Sons, Inc. Corporate Headquarters, 111 River Street, Hoboken, NJ 07030.

Affiliated with

Also associated with

Rating

Method of altering a bitstream does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of altering a bitstream, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of altering a bitstream will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3886776