Analog Devices ADSP-BF53x Blackfin, Reference

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ADSP-BF53x/BF56x Blackfin Processor Programming Reference 4-65
Program Sequencer
Note 1: For services (S), the return address is the address of the instruction
that follows the exception. For errors (E), the return address is the address
of the excepting instruction.
If an instruction causes multiple exceptions, only the exception with the
highest priority is taken. The following table ranks exceptions by descend-
ing priority.
Instruction fetch mul-
tiple CPLB hits 0x2D E More than one CPLB entry matches
instruction fetch address.
Illegal use of supervi-
sor resource 0x2E E Attempted to use a Supervisor register or
instruction from User mode. Supervisor
resources are registers and instructions
that are reserved for Supervisor use:
Supervisor only registers, all MMRs, and
Supervisor only instructions.
Table 4-12. Exceptions by Descending Priority
Priority Exception EXCAUSE
1 Unrecoverable Event 0x25
2 I-Fetch Multiple CPLB Hits 0x2D
3 I-Fetch Misaligned Access 0x2A
4 I-Fetch Protection Violation 0x2B
5 I-Fetch CPLB Miss 0x2C
6 I-Fetch Access Exception 0x29
7 Watchpoint Match 0x28
8 Undefined Instruction 0x21
Table 4-11. Events That Cause Exceptions (Cont’d)
Exception EXCAUSE
[5:0] Type:
(E) Error
(S) Service
See note 1. Notes/Examples