Patent · US Active

Encryption for XIP and MMIO external memories

US10691838B2 · kind B2 · utility

1Cited by

26References

20Claims

0Family size

Assignee

Cypress Semiconductor Corporation · US

Inventors

Hans Van Antwerpen · Mountain View, US
Jan-Willem van de Waerdt · San Jose, US

Key dates

Filing date	Dec 20, 2018
Grant date	Jun 23, 2020
Priority date	—
Expiry date	Dec 25, 2038

Classification

Technology area (CPC G)Physics
CPC primaryG06F2221/2107
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Techniques for multiplexing between an execute-in-place (XIP) mode and a memory-mapped input/output (MMIO) mode for access to external memory devices are described herein. In an example embodiment, an IC device comprises a serial interface and a controller that is configured to communicate with external memory devices over the serial interface. The controller comprises a control register and a cryptography block. The control register is configured to indicate an XIP mode or a MMIO mode. Caches in XIP interfaces provide seamless access to multiple memories, or multiple portions of a single memory. The cryptography block is configured to encrypt and decrypt XIP data transfers to and from a first external memory device in the XIP mode, and to encrypt and decrypt MMIO data transfers to and from a second external memory device in the MMIO mode.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.