Exhibit 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

   We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated April 17, 2000, with respect to the consolidated
financial statements and schedule of Applied Micro Circuits Corporation for the
year ended March 31, 2000, included in the Proxy Statement of MMC Networks,
Inc. that is made part of the Registration Statement (Form S-4) and related
Prospectus of Applied Micro Circuits Corporation for the registration of shares
of its common stock.

                                        /s/ Ernst & Young LLP

San Diego, California
September 11, 2000