Exhibit 99.1

              CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Wilfred J. Corrigan, certify pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly
Report of LSI Logic Corporation on Form 10-Q for the quarterly period ended June
30, 2003, fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 and that information contained in such Form 10-Q
fairly presents, in all material respects, the financial condition and results
of operations of LSI Logic Corporation.

                                   By:  /s/ Wilfred J. Corrigan
                                      ------------------------------------
                                   Name:  Wilfred J. Corrigan
                                   Title: Chairman & Chief Executive Officer