Peraso (PRSO) 10-Q 2011 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION OF CEO AND CFO FURNISHED PURSUANT TO

18 U.S.C. § 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of MoSys, Inc. (the “Company”) for the quarterly period ended September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of Leonard Perham, Chief Executive Officer of the Company, and James W. Sullivan, Vice President of Finance and Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Leonard Perham

Leonard Perham

President and Chief Executive Officer

November 9, 2011

/s/ James W. Sullivan

James W. Sullivan

Vice President of Finance and Chief Financial Officer

November 9, 2011

This certification accompanies this Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, or otherwise required, be deemed filed by the Company for purposes of § 18 of the Securities Exchange Act of 1934, as amended.