Analog Devices ADSP-BF53x Blackfin, Reference

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ADSP-BF53x/BF56x Blackfin Processor Programming Reference 4-61
Program Sequencer
Exceptions
Exceptions are synchronous to the instruction stream. In other words, a
particular instruction causes an exception when it attempts to finish exe-
cution. No instructions after the offending instruction are executed before
the exception handler takes effect.
Many of the exceptions are memory related. For example, an exception is
given when a misaligned access is attempted, or when a cacheability pro-
tection lookaside buffer (CPLB) miss or protection violation occurs.
Exceptions are also given when illegal instructions or illegal combinations
of registers are executed.
Table 4-10. Hardware Conditions Causing Hardware Error Interrupts
Hardware
Condition HWERRCAUSE
(Binary) HWERRCAUSE
(Hexadecimal) Notes / Examples
System MMR
Error 0b00010 0x02 An error can occur if an invalid Sys-
tem MMR location is accessed, if a
32-bit register is accessed with a
16-bit instruction, or if a 16-bit
register is accessed with a 32-bit
instruction.
External Memory
Addressing Error 0b00011 0x03
Performance
Monitor
Overflow 0b10010 0x12
RAISE 5
instruction 0b11000 0x18 Software issued a RAISE 5 instruc-
tion to invoke the Hardware Error
Interrupt (IVHW).
Reserved All other bit
combinations. All other values.