Datasheet

665
32133D–11/2011
UC3D
31.2.2 SAB Security Restrictions
The Service Access bus can be restricted by internal security measures. A short description of
the security measures are found in the table below.
31.2.2.1 Security measure and control location
A security measure is a mechanism to either block or allow SAB access to a certain address or
address range. A security measure is enabled or disabled by one or several control signals. This
is called the control location for the security measure.
These security measures can be used to prevent an end user from reading out the code pro-
grammed in the flash, for instance.
Below follows a more in depth description of what locations are accessible when the security
measures are active.
HSB 0x5
Alternative mapping for HSB space, for compatibility with
other AVR32 devices.
Memory Service
Unit
0x6 Memory Service Unit registers
Reserved Other Unused
Table 31-1. SAB Slaves, Addresses and Descriptions
Slave Address [35:32] Description
Table 31-2. SAB Security Measures
Security Measure Control Location Description
Security bit
FLASHCDW
security bit set
Programming and debugging not possible, very restricted
access.
Table 31-3. Security Bit SAB Restrictions
Name Address start Address end Access
OCD DCCPU,
OCD DCEMU,
OCD DCSR
0x100000110 0x100000118 Read/Write
User page 0x580800000 0x581000000 Read
Other accesses - - Blocked
Table 31-4. User Code Programming SAB Restrictions
Name Address start Address end Access
OCD DCCPU,
OCD DCEMU,
OCD DCSR
0x100000110 0x100000118 Read/Write
User page 0x580800000 0x581000000 Read