Method and device for protecting dynamic random access memory

US10331577B2 · kind B2 · utility

Assignee

• Montage Technology, Inc. · CN

Inventors

• Shuna Xu · Shanghai, CN
• Guobing Mo · Shanghai, CN
• Cheng-Tie Chen · Shanghai, CN

Key dates

• Filing date: Mar 14, 2016
• Grant date: Jun 25, 2019
• Expiry date: Apr 16, 2036

Classification

• Technology area (CPC —): General

Abstract

A method for DRAM protection comprises allocating address spaces respectively for a first and second common region, a first and second secure region; detecting whether common data has an address within the address spaces for the first secure region; outputting a digital signal remapping an address of the common data to the address space for the second common region if yes; detecting whether secure data has an address within the address spaces for the first common region; outputting a digital signal indicating remapping an address of the secure data to the address space for the second secure region if yes. Alternatively, the method further comprises generating a random key; an updated written data by permuting orders of bits of an original DRAM written data; generating an encrypted data by performing a function on the updated written data with the generated random key; and dynamically updating the generated random key.