Cirrus Logic EP93xx - Manual (Page 809)

DS785UM1 29-1
Copyright 2007 Cirrus Logic
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Chapter 29
29 Security
29.1 Introduction
Security is a generalized architecture consisting of Boot ROM, laser fuses and proprietary
circuitry for secure hardware initialization. In the context of this environment, the chip
supports multiple digital-rights-management content-protection from several security
vendors, (such as Microsoft and InterTrust). It exceeds all the requirements set forth by the
Secure Digital Music Initiative and allows for protection of object code as well as content.
29.2 Features
Key features include:
• 256 bits of laser fuse for permanent IDs and passwords.
• Security boot firmware and private passwords are “invisible” except when the IC is
“locked”.
• Each instantiation of the system software may be uniquely encoded and protected using
the private ID.
• Multiple security vendors can co-exist in the same system.
• JTAG functionality is disabled when security is enabled.
• External boot is disabled when security is enabled.
29.3 Contact Information
Contact Cirrus Logic at www.cirrus.com for additional information regarding security features.